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PTC 200 Requirements for Connection of Customer

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1. up signal Ces MK 500 ms 300 bits 180 bits Customers Calling Line Information 200 ms te Idb 0101 4111 San BR be 250 ms 150 ms R 9 Beginning of 2000 ms DA the Second 2600 ms DA2 eee 1400 ms DA3 DA4 End of the First Ringing Cadence Ringing Time Total Number Characters Available Characters Available for Cadence Available of Characters for ACLIP Directory ACLIP Directory for CLI Number Single Data number and Name Message Format 2 Multiple Data Message Format 3 DA1 900 ms 108 97 91 DA2 1500 ms 180 169 163 DA3 4 300 ms 36 25 19 Notes 1 10 bits per character 1200 bps 2 Overhead for SDMF Message Type 1 Character Message length 1 Character Date Time 8 Characters Directory Number X Characters Checksum 1 Character Total Characters 11 X 3 Overhead for MDMF Message Type Message Length Date Time Parameter Type Date Time Parameter Length Date Time Directory Number Parameter Type Directory Number Parameter Length Directory Number Name Parameter Type Name Parameter Length Name Checksum Total Characters 17 X Y 1 Character 1 Character 1 Character 1 Character 8 Characters 1 Character 1 Character X Characters 1 Character 1 Character Y Characters 1 Character FIG 11 3 TIMING DIAGRAM FOR ANALOGUE CALLING LINE IDENTIFICATION SIGNALS 11 1 5 Number format passed from the network 1 For local and national calls
2. 3 The User Instructions shall clearly state any restrictions on the loop resistance of line between the series device and the CPE connected to it such that sufficient current can be drawn to establish the off hook condition e Equipment covered by this clause though series connected is normally expected to be installed within the same premises as the terminal CPE As a result the line length will normally be extremely short e For the small number of cases involving devices which are designed to be installed remote from the terminal CPE consideration must be given to the Telecom local line limits i e the limit will apply to the total of the length of line between exchange and device plus the length of line between the device and the terminal CPE For such devices each application will be considered on its individual merits 4 Ripple components shall not exceed 2 mV psophometric 5 The line feed shall be such that the equipment recognises the CPE state as follows a Off hook when the d c feed current is greater than 15 mA for a period not less than 10 ms for a load of 1000 Ohms e When ringing is being sent to CPE the ring trip d c would normally have to be maintained for 40 ms or more b On hook when the d c feed current is less than 5 mA for a period not less than 1000 ms for a load of 10 KOhms 6 Many CPE devices have features such as last number redial or memory dial which depend on a small on h
3. Minimum Return Loss FRG relaxed in 0 6 3 4 kHz range Limit gt 15 dB Minimum Return Loss for limited bandwidth products Limit gt 3 dB where signal is below 30 dBm show levels on return loss figures for 4 5 1 2 Echo Return Loss during Hold Limit gt 3 dB Minimum Return Loss during DTMF signalling Limit gt 5dB Minimum On Hook Line Impedance over frequency range 300 3400 Hz Limit gt 10kQ Port impedance series connected CPE Series connected terminating device Minimum Return Loss of the PSTN line port vs BT3 in 0 3 1kHz range Limit gt 10 dB Minimum Return Loss of the PSTN line port vs BT3 in 1 3 4kHz range Limit gt 12 dB Echo Return Loss of the PSTN line port vs BT3 Limit gt 14 dB Minimum Return Loss of the terminal equipment 2 wire port vs BT3 in 0 3 1kHz range Limit gt 10 dB Minimum Return Loss of the terminal equipment 2 wire port vs BT3 in 1 3 4kHz range Limit gt 12 dB Echo Return Loss of the terminal equipment 2 wire port vs BT3 Limit gt 14dB PTC 200 May 2006 4 9 4 9 1 3 4 9 2 4 4 9 3 4 9 4 4 9 5 132 Series connected non terminating device Min Return Loss of the PSTN port while the proprietary port is BT3 terminated 20 mA 80 mA Limit gt 25 dB Impedance Balance Ratio to Earth Impedance Balance Ratio to Earth for all devices in 0 2 4 kHz range On hook Off hook On
4. Sores connected DUT Z S Ja lebairt HG 7 5 TEST SETUP FOR SERIES CONNECTED ANGING DEWCES All component tolerances to be 148 Z K a e Du z SZ ELS vi Ka T gt Z WX S Oo LD EOE LD SI Teleg m FIG 7 3 TEST SET UP FOR SERIES CONNECTED RINGING DEVICES 4 For devices which do not detect or respond to ringing this Ringer Loading number shall become the RN of the device because there is no ringer sensitivity 76 PTC 200 May 2006 5 All such series connected devices which respond to ringing shall be tested for ringer sensitivity and the RN derived as follows a For devices which disconnect the terminal ports while responding to the first cadence of incoming ringing from line ringer sensitivity and RN shall be assessed in accordance with 7 5 2 and 7 6 with the terminal ports disconnected A common example is a distinctive alert decoder which responds to the first cadence of incoming ringing and then extends subsequent cadences to a terminating equipment port Such a device has to be assessed for ringer sensitivity during the first cadence when the terminating ports are disconnected and there is no ringing load b For devices which respond to ringing but have their terminal ports connected at the same time sensitivity and RN shall be assessed by varying the ringing loads connected in parallel with the line and terminal equipment ports Details of the test method are given in Appe
5. 3 Non terminating devices Series connected equipment which has only a non terminating function is characterised by the following a The line port does not terminate the PSTN line but instead passes all signals directly between the two ports b The D C loop required for terminating or initiating a call is usually provided by separate equipment connected to the terminal equipment port c There is likely to be series and shunt impedances within non terminating devices as shown in Fig 2 1 b e A typical example of a non terminating series connected device is call monitoring equipment Terminating Impedance Terminating Impedance PSTN Terminal equipment Line port a EE Terminal eries connected device device FIG 2 1 a SERIES CONNECTED DEVICE TERMINATING MODE 24 PTC 200 May 2006 ow Series impedance p High shunt impedance Terminating Impedance PSTN Line Line port Terminal Series connected dewice device FIG 2 1 b SERIES CONNECTED DEVICE NON TERMINATING MODE 4 Multi function devices Use of the signal functions described in clause 2 12 1 varies on certain types of series connected devices Such equipment may operate as a terminating device for some functions and a non terminating device for others or they may vary for different stages of a call For this reason the terms terminating and non terminating shall for the purposes of this Specification be reg
6. If requirements of 1 above are determined by other device e g PC warning notice required in User Manual Complies Yes No NA Voice Announcements amp Recognition Tones Voice announcement or tone provided within 5 secs of answering call Complies Yes No If device automatically switches call voice announcement to be provided and ring tone must be distinctively different to Telecom ring tone Complies Yes No NA Yes No Yes No Yes No Yes No NA Yes No Yes No NA Yes No NA Yes No Yes No NA PTC 200 May 2006 145 Call Release Equipment capable of initiating or answering calls shall release such calls as follows Within 60 secs of carrier failure or lack of activity tee secs Limit lt 60 secs Within 15 secs of completion of intended function eee secs Limit lt 15 secs Within 5 secs of power supply failure aes secs Limit lt 5 secs If device automatically switches call after answering call shall be released if extension not off hook within 60 secs of call being initially answered fees secs Limit lt 60 secs Automatic answering devices with no supervisory capability shall release within 2 mins of going off hook Yes No NA Complies Yes No NA Recording Functions Warning notice about legal requirements for recording devices shall be provided in User Instructions Yes No Complies Yes No BILLING SECURITY Cordless Devices Security process shall be provided Yes
7. 1 5 The High Group frequencies shall be as follows line current 80 mA 1209 Hz 1336 Hz 1477 Hz 1633 Hz Limit 1 5 The Low Group frequencies shall be as follows line current 20 mA 697 Hz 770 Hz 852 Hz 941 Hz Limit 1 5 The High Group frequencies shall be as follows line current 20 mA 1209 Hz 1336 Hz 1477 Hz 1633 Hz Limit 1 5 10 numeric digits plus and symbols shall be supported Limit complies YES or NO DTMF signalling requirements DTMF requirements shall comply in the current range of 20mA to full current Limit complies YES or NO Return Loss during signalling shall comply with 4 5 8 Limit not less than 5 dB PTC 200 May 2006 Yes No Yes No Yes No Yes No Yes No 5 2 3 a 5 2 4 1 5 2 5 5 3 1a 5 5 5 5 1 2a 135 DTMF power level detailed test results to be attached 13dBm lt Limit lt 4dBm DTMF pre emphasis detailed test results to be attached 1dB sLimit lt 3 dB DTMF intermodulation detailed test results to be attached Limit 220dB below Signal timing Minimum tone ON duration Limit 60 milliseconds Minimum interdigital pause Limit 60 milliseconds Series connected equipment Harmonic distortion of DTMF signals introduced by series connected device Limit lt 5 DTMF Signalling facility for series conne cted terminating devices shall comply with 5 2 1 to 5 2 3 Limi
8. 2 9 Protection from line interference AAA 19 2410 Zeene 20 Sch e lt T niel Tale testing eeen eee eree eee eee eee eee eE Eee EErEE EEE EEEE 20 Cake eelere 20 2 11 2 ROSE Tele 21 2 12 Multi function and series connected equipment sss sese eee eee 22 Ska Wl KEE Le LEE 22 2 12 2 Terminating BE Tree EE 22 212 3 Bridging ele a cas ni teknikoa etn ea eed ni eit eh Neen ty 22 2 12 4 Series connected devices esse sese 23 OEP Re TE 25 SC General eree eaae EE EE 25 4 TRANSMISSION REOUIREMENTS 36 4 General EE 36 4 2 Transmitted power liMImMations se sss eee eee eee 37 4 3 Noise and ee E 38 4 3 1 Equipment See e EE 38 3 PTC 200 May 2006 4 3 2 EQGUIDINGME OMANOOK EE 39 4 3 3 Multi line Ee 40 AA Re 40 4 5 Line impedance of hedevice AAA 40 4 5 1 Off hook line impedance EE 40 4 5 2 On hook line impedance ett eee 42 4 6 Port impedances of series connected devices sse 42 4 6 1 Terminating devices ssssssssseeseceeee eee eeee enoe 42 4 6 2 Non terminating devices sss sese eee eee eee 42 4 7 Impedance of bridging equipment ccceeeeeeceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeetess 43 4 8 Impedance balance ratio to earth eee eee 43 GC BE e Heel EE 44 4 9 1 Send frequency response of telephony devices eee eee ee 44 4 9 2 Receive frequency response of telephony devices eee 45 4 9 3 Non voice equipment eee 46 4 9 4 Benes connected Ree 46 4 9 5 lge Lei BET 47 4 10 Send and Receive Loudness Ratings SLR amp RLR eee 47 4 11 Sideto
9. 5 Balance ratio to be determined with device in both on hook and off hook conditions FIG 4 6 MEASUREMENT OF IMPEDANCE BALANCE RATIO TO EARTH 4 9 Frequency response 4 9 1 Send frequency response of telephony devices 1 The send frequency response of telephony devices connected to a zero length line with the line current set at 20 mA should preferably be within the limits specified below and shown in Fig 4 7 e The purpose is to ensure that the telephone is not excessively sensitive or excessively insensitive at particular frequencies This is done by controlling the shape of the mask 2 The coordinates of the send frequency response mask relative to the mid point of the mask at 1 kHz are as follows Frequency Lower Limit Upper Limit Hz dB dB 100 12 200 0 300 16 5 25 1000 3 2000 3 15 3000 8 25 15 4000 15 5000 0 e The values shown are not absolute values but arbitrary relative levels with respect to the mid point of 45 PTC 200 May 2006 the mask at 1 kHz Compliance is checked by plotting frequency response on the same scales as the mask and adjusting the mask for best fit e The figures in parenthesis are shown for guidance only and indicate the preferred performance at 100 Hz and 5000 Hz e Poor frequency response at the higher frequencies can result in poor articulation and the send mask is purposely sloped upwards to compensate for the frequency response of undergro
10. A minimum delay of less than 3 seconds on equipment designed for calls between machines and normally addressed to unlisted numbers e Typical examples are short data calls such as electronic fund transfers and credit card authorisation calls where the entire length of call is likely to be less than 3 seconds b Extended maximum delays where there are specific operational reasons 82 PTC 200 May 2006 8 2 2 Voice announcements and recognition tones 1 Some form of voice announcement or recognition tone e g 2100 Hz shall be offered to the caller within 5 seconds of answering the call e This is to ensure that the calling party who will usually be paying for the call is aware that the call has in fact been answered and charging has commenced 2 Any facility for providing voice announcements when answering a call should have the capacity to store an announcement of at least 10 seconds duration e This allows sufficient time for a clear message bearing in mind that most callers will usually miss the first word or two of any announcement unless it is repeated 3 Some equipment also has an automatic switching function which is performed after the call is answered On such devices unless a suitable voice announcement is made any ringing tone returned to the calling party shall be recognisably different to that used by Telecom in the PSTN ref Technical Document TNA 102 clause 7 1 e A suggested sequence is as follows a
11. A1 1 Evaluation principles 1 Telecom has an obligation to protect all its customers against avoidable malfunctions by ensuring that the whole system meets recognised standards Any malfunctions can lead the customer to suspect the integrity of the Telecom network Telecom therefore has to be assured that all equipment connected to its network is likely to meet the minimum standards set by this Specification 2 Absolute confidence in the equipment connected would require that every item be thoroughly tested but this is clearly impractical For most types of equipment a test of one unit is accepted as a reasonable means of assessment However for telephony devices the electro acoustic facilities require a more stringent approach and a minimum sample of three units are required to be tested e Previously Specification PTC 202 called for 20 samples of telephones to be tested 3 Limits in this Specification make full allowance for production tolerances e Telecom accepts that any production process needs to have some allowance for process and component variability and the various limits have been set as a compromise between network ideals and typical production capability A1 2 Number of samples A1 2 1 Simple telephony devices 1 For all simple telephony devices a sample of three units shall be submitted to a recognised Testing Authority for each electrical acoustic design for testing against this Specification All three units
12. Message acceptance tone beep is a brief tone or beep signal to a caller that an automatic answering device is in the receive mode and is ready to accept and record a message Message waiting is indicated by a blip in dial tone to indicate to the customer that there is a message waiting on the Call Minder service Modem is the signal conversion equipment which converts the digital signal output from a terminal or computer into analogue signals suitable for transmission over a Telecom line and vice versa by a process of modulation and demodulation e Modem is a contraction of modulator demodulator Monitoring is the detection of signals on a line both supervisory and or voice without taking an active part in a communication over that line e Monitoring equipment may be designed to detect specific line conditions such as whether the line has been seized or not the presence of ringing or it may monitor the actual communication itself e Equipment monitoring a line will usually but not necessarily be in the on hook high impedance mode e The use of such equipment is subject to the Privacy Act 1993 the Telecommunications Act 1987 and the Crimes Act 1961 30 PTC 200 May 2006 Monitoring facility in the context of recording equipment is the provision of a device which monitors all signals present on a line while a call is in progress Monitoring facility in the context of automatic calling equipment is
13. being classified as a standard retail product System dependent terminal or device is an item of customer premises equipment specifically designed for use with and dependent on a particular type or make of customer switching system or other customer equipment e System dependent devices are not considered suitable for direct connection to a standard Telecom PSTN without the mother system They usually incorporate a proprietary interface e Customer switching systems normally take the form of PABXs or key telephone systems Telecom PSTN is the Public Switched Telephone Network provided and operated by Telecom New Zealand Ltd e The PSTN also includes the connection to other switching systems e g PABXs which may be installed in private premises but which are directly connected to the PSTN It does not include the interconnection of private switching systems via leased lines 34 PTC 200 May 2006 e Telephones suitable for the Telecom PSTN are also often suitable for use with PABX and Key Telephone Systems Some systems however require special purpose designed telephone instruments described as system dependent instruments to provide their particular features Telephony device is any device having the ability to convert acoustic signals into electrical signals or vice versa for the purposes of transmission over a telephone network e Such facilities are normally known as electro acoustic facilities Terminal equipment
14. clear and comprehensive User Instructions shall be supplied e This is particularly important for devices intended to operate with Telecom s Caller Display service 2 In addition to the specified mandatory warnings it is recommended that the User Instructions also include a brief explanation of the reasons behind these requirements 3 The user instructions shall clearly explain a the appropriate dialling procedures for local and national calls for both direct line and Centrex customers e The most commonly used exchange line access prefix for New Zealand PABX systems Telecom Centrex lines etc is the digit 1 However other access digits may also be encountered b The impact of non code access to a network other than the local network to which a display unit is connected 4 To minimise liability under New Zealand consumer protection legislation suppliers shall make purchasers aware of this issue by inserting the following warning in the User Instructions If a charge for local calls is unacceptable the Dial button should NOT be used for local calls Only the 7 digits of the local number should be dialled from your telephone DO NOT dial the area code digit or the O prefix 59 PTC 200 May 2006 e Under New Zealand consumer protection legislation the supplier is responsible for ensuring that a product is fit for its intended purpose A warning to the above effect is likely to minimise the n
15. equipment Such equipment is usually connected to unlisted numbers or in such a way that it does not interfere with normal telephone operation or impact on other users e A typical example is equipment which initiates but does not receive calls b Equipment which is used infrequently or under restricted conditions for purposes other than normal voice or data communication Such equipment is generally installed professionally 13 PTC 200 May 2006 e An example is an alarm system which makes outgoing calls only in the event of emergencies c Equipment not offered for sale in retail stores to the general public e These three categories will generally apply to low volume specialised or high value products where the area of non compliance is considered to have minimal impact on that product s primary functions 2 It is not possible to publish a list or to quantify the exemptions that may be granted The nature of professional equipment is such that every case has to be treated on its individual merits 3 Where a Telepermit is granted for such equipment which is not fully compliant with every mandatory requirement the approach used will be based on an overall assessment taking into consideration all other mandatory and voluntary requirements 4 If a product considered by the applicant to fall into the professional equipment category fails a test carried out by a Testing Authority then the applicant should a Discuss t
16. last number redial etc e Types of equipment covered are memory fax machines telemarketing equipment security alarm equipment etc e Requirements for devices with manually initiated automatic dialling facilities are covered by clause 5 6 e g last number re dial telephones with memory dialling call back devices etc 8 1 2 Call initiation 1 Equipment designed for automatic calling whether for repeat calls to the same number or to different numbers shall either a Detect dial tone or b Introduce a delay of at least 1 second and not more than 7 seconds before commencement of dialling e Any pre programmed numbers should be clearly associated with the name of the called party to enable ready revision in the event of number changes 2 Equipment shall not go off hook automatically for reasons other than a call attempt except as follows a On no more than two occasions each for a period of 1 5 seconds duration and b Only within the 30 minute period immediately following completion of a call or an unsuccessful call attempt e Some equipment automatically goes off hook briefly to check for conditions such as message waiting i e stutter dial tone It is not acceptable for this function to continue indefinitely and it is therefore restricted to the first 30 minutes following completion of a call or call attempt e Some devices are designed to repeatedly activate the off hook condition for secur
17. ref clause 4 16 VU meters For further information on VU meters reference should be made to the CCITT White Book referred to above However copies of that document may be difficult to obtain in New Zealand and for this reason the following information is given Characteristics of VU Meter 1 Ifa sinusoidal signal in the frequency range 35 Hz to 10 000 Hz of an amplitude which causes a reference deflection of 0 VU under steady state conditions is applied to the meter then that meter shall initially register 99 of the reference deflection within 0 3 seconds 10 It shall then overswing the reference deflection by 1 1 5 2 The total time required for the meter pointer to reach its position of rest on the removal of the signal shall not be greatly different from the time of response 110 PTC 200 May 2006 3 The variation of response with frequency from that at 1 kHz shall be within the following limits a No more than 0 2 dB between 35 and 10 000 Hz b No more than 0 5 dB between 25 and 16 000 Hz 4 The point of reference deflection shall be marked 0 VU The remainder of the scale shall be graduated in VU above and below reference deflection 4 3 Noise and crosstalk The test set up for testing noise and crosstalk levels is shown in Fig A1 using zero length line and a 600 Q non reactive resistor as RL A measuring instrument of high input impedance is connected across the 600 Q resistor calibrated in unit
18. that port shall support both 2 wire and 3 wire connected devices as required by clause 7 7 2 3 10 3 3 Fault clearance 1 There are significant fault clearance considerations for series connected devices which impact on the premises wiring which is to be maintained by Telecom Mandatory requirements are detailed in the following sub clauses Two types of installation directly concerned are as follows a Any installation with a device requiring secondary fixed wiring on the terminal side of the device 2 Secondary fixed wiring Some devices are designed for installations where there is a possibility of secondary fixed wiring arrangements on the terminal outlet side In such cases the customer will need to be aware of the necessary procedure in the event of a fault affecting the series connected device These devices shall have an entry in the User Manual as follows In the event of any problem with this device it is to be disconnected and a CPE item connected to one of its terminal ports may be connected directly in its place The user should then arrange for the product to be repaired Should the matter be reported to Telecom as a wiring fault and the fault is proven to be due to this product a call out charge will be incurred 10 4 Connection method for externally mounted devices 1 Any device designed for installation outside of buildings on customers premises and subject to exposure to the weather shall NOT be capa
19. the number sent forward from the Telecom network is in the format area code plus customer number No 0 national call prefix is passed 95 PTC 200 May 2006 forward from the network e This is the format used within the Telecom network and between New Zealand networks for passing calling numbers For such applications the 0 has no meaning e Display equipment designers should note that there is no format differentiation between national and local calls e The great majority of calls will consist of 8 digits but calls from mobile networks will be up to 10 digits in total e As examples on a typical 10 digit display originally designed for the North American network an Auckland caller s number could be displayed as 9 876 5432 Telecom cellular callers numbers which could be either 8 or 9 digits could be displayed as 2 567 8901 or 25 234 5678 2 For incoming international calls entering New Zealand via a Telecom International Exchange the digits 0000 are currently passed forward This will continue to be the practice for any international numbers that are either not available or need to be withheld in the future for any reason e The actual numbers are currently withheld to protect the privacy of overseas callers e It should be noted that not all international calls arrive in New Zealand via the Telecom Gateway Many arrive via other carriers 3 In due course some internat
20. No Complies Yes No Security Codes for Cordless Devices Manufacturers assurances that security codes provided between handset and base Yes No Complies Yes No There shall be a minimum of 8000 No of codes sse codes available Number of codes available to device to be stated in User Instructions Yes No Complies Yes No Description of how security codes allocated shall be supplied and written assurance that allocation results in random spread of codes over units to be marketed Yes No Complies Yes No If security code lost is reallocation truly random Yes No Complies Yes No Description provided on how codes are transferred between portable and base to ensure security Yes No Complies Yes No PTC 200 May 2006 10 0 10 2 10 4 146 On originated calls security code shall be automatically transmitted by portable and base only seizes line after code received Complies Yes No NETWORK CONNECTION Connection Methods Connection method compliant with 10 2 1 5 Complies Yes No Series Connected Devices Line Grabbing Connections Line grabbing devices shall be supplied with detailed instructions of connection Complies Yes No Handover Any break in d c loop during handover to another device shall not exceed 9 ms Device shall comply with either a or b Fault Clearance If device is likely to use secondary fixed wiring on the terminal equipment side a warning notice
21. RL of the device itself derived from RL 5 Lpy Limit 0 lt RL lt 5 For series connected non terminating device not responding to ringing then RN RL Series connected non terminating device which does respond to ringing but has its terminal ports disconnected during the first ringing cadence RS and RN to be assessed as in 7 5 2 amp 7 6 Series connected non terminating device which is responding to ringing but has its terminal ports connected during the first ringing cadence shall be tested for RS and RN Limit 0 lt RS lt 5 Limit 0 5 lt RN lt 5 Series connected devices with terminating facility eg answering a call shall comply with 7 5 amp 7 6 Complies Yes No NA Terminal Equipment Extension Ports Series connected device shall not connect ringing to an extension port when the port is in OFF Hook state Complies Yes No NA Series connected device extending the call to an extension port via 4 wire path shall reproduce PSTN ringing cadence within 5 in timing distortion Complies Yes No NA Terminal ports shall support ringing for 2 amp 3 wire CPE Complies Yes No NA Locally generated ringing The ringing supply shall comply with electrical safety requirements of AS NZS 3260 Complies Yes No NA The ringing voltage and duration shall comply with the requirements of AS NZS 3260 Complies Yes No NA The ringing supply extended to a port shall be connected to one wire w
22. Specification for plugs to be used with British Telecom line jack units 7 PTC 200 May 2006 FOREWORD The purpose of this Specification is to ensure that all new analogue Customer Premises Equipment CPE intended for connection to the Telecom network is compatible with that network In particular the telephony performance of the Telecom PSTN in terms of ease and clarity of conversation is highly dependent on the achievement of optimum Loudness Ratings for the connected CPE In turn the ITU T Recommendations for overall performance of the international network are satisfied only when the CPE used at both ends of the call is designed to match the network to which it is connected This Specification covers the minimum technical requirements for the grant of Telepermits for such CPE In addition this Specification covers a broad range of recommended parameters to assist those manufacturers who wish to exceed the stated minimum requirements This Specification makes a clear distinction between these mandatory and voluntary performance requirements The coverage of this Specification includes the full range of analogue connected products from basic telephones modems facsimile machines etc to high value specialised devices such as video phones computer peripherals etc Requirements for more complex equipment having analogue connections such as larger PABXs multiplexers etc together with digital ISDN devices are all covered
23. T 98 12 2 Switches and eine 98 12 3 Modifications sss eee eee eee 98 124 eege EE 99 13 EQUIPMENT DOCUMENTATION sse eee 100 T3 T EE 100 13 2 Documentation reouirement AAA 100 13 3 User Documentation Warnings AAA 100 6 PTC 200 May 2006 APPENDICIES Appendix 1 SAMPLES AND EVALUATION xxe eee ee 105 Appendix 2 TEST PROCEDURES ugeet vtec eege ies Ween NEEN 106 Appendix 3 TEST SCHEDULE see 128 RELATED TELECOM DOCUMENTS PTC 100 Permit to Connect Telepermit General Conditions PTC 107 Technical Requirements for PABX external ports PTC 220 Technical Requirements for Private Voice Networks connected to the PSTN TNA 102 Telecom PSTN Analogue Interface TNA 118 Telecom DDI Interfaces TNA 151 Telecom Telephone Network Transmission Plan Australian Communications Authority ACA Australian Communications Industry Forum ACIF Standards S 001 1991 Safety Requirements for Customer Equipment Applicable only until July 2004 S 002 1996 Analogue Interworking amp Non interference Requirements for Customer Equipment Connected to the PSTN S 003 1992 Customer Switching Systems Connected to the PSTN S 004 1996 Voice Frequency Performance Requirements for Customer Equipment AS NZS 60950 Safety Requirements for Information Technology Equipment including business equipment AS NZS 3260 1993 Safety Requirements for Information Technology Equipment including business equipment Applicable only until July 2004 BS 6312 1985
24. Transmitted power limitations The test set up for checking the transmitted power levels is shown in Fig A1 using zero length line and a 600 Q non reactive resistor as RL Tests shall be carried out at current values of 40 mA and full current or 80 mA 1 a amp b Signals should be measured over their full period or over 1 minute for longer duration signals It is acceptable to measure a large number of instantaneous values over this period and then average these values c The maximum value of instantaneous power is to be measured by recording the highest peak measured during a 1 minute period of normal transmission The tests should be made for all combinations of speed and modulation in multiple speed equipment 109 PTC 200 May 2006 2 For the acoustic stimulus test of telephony devices the measuring instrument must be calibrated in dBV rms Sinusoidal signals are applied to the mouth reference point at a sound pressure level of 20 dBPa at a frequency of 1 kHz 3 amp 4 The transmitted power level of recorded speech shall be measured using a VU meter and associated adjustable attenuator as follows a The adjustable attenuator which should have a control graduated in VU s is to be connected such that the signal being measured is applied to the VU meter via the attenuator e A correctly calibrated VU meter with active input will give a reference deflection 0 VU when bridging a transmission line at a point where a s
25. a means of identifying particular items of CPE e Typically used as a means of indicating a specific person or function required by the caller e g facsimile modem telephone etc or the nature of the call on Centrex Separate numbers are allocated to individual cadences when this service is provided see Technical Document TNA 102 e This service may also be known as Private Ringing Distinctive Alert decoders is a customer device which decodes the incoming DA code and applies ringing to the required item of CPE e There are two types of Distinctive Alert decoder known as Types 1 and 2 which are described in the text of Section 11 DTMF Dual Tone Multi Frequency or touch tone is the signalling method used both for call initiation and for the accessing of other services following connection of a call Two tones are sent simultaneously to line for each digit hence the word dual The system provides high immunity from spurious signals such as speech and noise not intended to be recognised as signalling information e The system used in New Zealand is to the current world standard described in the ITU T Recommendation Q 23 1988 Echo return loss is a weighted integral of the return loss frequency function over the band 300 3400 Hz e See also definition of return loss To calculate echo return Joss from the individual return loss measurements at given frequencies the approximation formula for de
26. calls 6 Customers equipped with the necessary specialized non voice equipment may require special protocols or procedures to guard against unauthorized access by hackers Any such procedures are permissible provided they do not constitute a nuisance to naive callers and they comply with the signal level and frequency requirements of this Specification 19 PTC 200 May 2006 2 8 Electrical safety 2 8 1 General All equipment intended for connection to the Telecom network including plug in cards and modules shall conform to the safety requirements of the joint Australian and New Zealand standard AS NZS 60950 including AS NZS 3260 1993 or later version s For the purposes of equipment testing ELV is defined in AS NZS 60950 and AS NZS 3260 1993 as voltages below 42 4 Vac peak and 60 Vdc e This should not be confused with the definition of ELV applicable to electrical wiring covered by the New Zealand Electricity Regulations where it is defined as 32 Vac rms and 115 V dc e A considerable proportion of telecommunications equipment available is manufactured for the North American and Japanese markets where the mains voltage is only 100 110 V Such overseas equipment may be compliant with the North American local requirements of AS NZS 60950 but designed with inadequate internal clearances between its components to meet New Zealand requirements which are based on 230 V operation 2 8 2 External power supplies 1 Where the equi
27. can be displayed shall be stated in all Telepermit applications 11 1 7 Data storage 1 For on hook data transmission equipment there are no mandatory requirements for the amount of incoming data that can be stored However there are obvious benefits in storing such data particularly in unattended situations 2 On analogue CLI devices it is recommended that the details for at least 10 calls be held in memory on a first in first out basis 3 If data storage is incorporated the CLI device shall also discard any data which becomes corrupted 97 PTC 200 May 2006 11 1 8 Dial back considerations 1 Requirements for automatic dial back facilities are covered in clause 5 6 2 Display units having no dial back facility are acceptable for Telepermit purposes All such devices shall be provided with clear instructions to users to ensure that the risk of wrong numbers is minimised This particularly applies to display units which do not display precisely the digits to be dialled see clause 11 1 6 98 PTC 200 May 2006 12 PHYSICAL CONSTRUCTION AND MODIFICATIONS 12 1 External design There are no formal Telecom requirements for the external design or appearance of any equipment other than where the physical construction prevents compliance with a The electrical safety requirements specified in AS NZS 60950 or b The performance requirements of this Specification 12 2 Switches and connectors All connectors sw
28. clause 2 11 1 6 and 7 e An example of this type of equipment is a 33 6 kbit s data modem capable of reducing its operational bit rate until successful transmission is obtained e A typical warning notice is given in Section 13 under clause 2 11 1 4 9 4 Series connected devices The frequency response requirements of series connected devices over the frequency range 300 3400 Hz are as follows a 2 wire series connected devices in the non terminating state shall have an insertion loss of no more than 1 GB at all frequencies when the indirectly connected terminal device is off hook and connected to line see Fig 4 4 b 4 wire series connected devices in the non terminating state shall have an 47 PTC 200 May 2006 insertion loss of no less than 2 dB and no more than 3 dB at all frequencies when the indirectly connected terminal device is off hook see Fig 4 5 e 2 wire 4 wire 2 wire devices normally have gain facilities but there is a need to guard against instability within the product when the 2 wire ports are connected to line or other equipment To achieve this without unduly penalising the attenuation an insertion loss of 2 3 dB is specified c The objective maximum insertion loss for series connected devices is 1 dB at all frequencies but such is the variety of devices in this category that this is not a mandatory requirement Each case will be treated on its individual merits d Series connected devices set
29. current in excess of 150UA Limit 2150 uA If the answer to 6 a is No then the warning note regarding a potential memory loss shall be provided Complies Yes No N A If answer to 6a is Yes indicate how many devices this port can cater for also allowing for limitation of clause 7 7 2 Fail safe requirements All customer equipment On restoration of a c mains from power failure the device shall maintain an ON Hook state Complies Yes No A failure of a battery powered CPE shall be prevented from harming Telecom Network in any way Complies Yes No Warning notice required if telephony function lost under power fail conditions Complies Yes No Series connected device additional The basic telephony service shall be maintained when serial device fails Complies Yes No For multi port devices at least one port of a serial device shall be connected to line if power fails Complies Yes No In case of operational failure a multi port device shall revert to a predetermined state with details in the user manual Complies Yes No PTC 200 May 2006 Yes No NA Yes No NA Yes No Yes No Yes No Yes No Yes No Yes No 3b 6 12 7 0 S i 7 2 3a 3d 7 3 7 5 7 5 1 140 In case of operational failure on a single port device details of any failsafe connection arrangements shall be stated in the user manual Complies Yes No PABX call
30. desirable as this may occur on occasions 62 PTC 200 May 2006 particularly from derived circuit systems during mains power failure e Notwithstanding compliance with these requirements no guarantee can be given that effective transmission will be achieved between or by two or more items of equipment which are connected to the same line 6 4 Supervisory conditions 1 Line seizure Customer equipment shall initiate an outgoing call seize an exchange line by going off hook and drawing d c line current from the PSTN line see also clause 8 1 for devices with automatic line seizure facilities 2 Ring trip Similarly customer equipment shall answer an incoming call trip the incoming ring by going off hook and drawing d c line current from the PSTN line 3 Call release The equipment shall terminate a call by going on hook and breaking the line current At this point it shall be ready to receive a subsequent incoming call e These conditions also apply to series connected devices ref clause 6 9 1 4 4 It is strongly recommended that hookswitch contacts are debounced to avoid spurious line seizure following call release 5 To ensure satisfactory performance of each of these supervisory functions the device shall satisfy the mandatory requirements given in clause 6 3 e An increasing number of line feeds have limited current sources such as those provided by derived circuit equipment and many PABXs For th
31. erener a a a E a 63 BCS Recall and Call Waitin eoc cesccosetceceesct cece eeen reeeo reeek 63 6 9 Series connected egupment rrtt tttnnnnn rnnr eene 64 6 9 1 D C line characteristics E 64 6 9 2 Call eilel Hee Eed 65 6 9 3 Il CONISION EE 66 6 9 4 Line grabbing equipment sese sese eee eee eee eee DD 6 10 D C line feed to other devices A 67 6 11 Fail safe requirements EE 68 6 11 1 All customer e EE 68 6 11 2 Additional requirements for series connected eupment sss eee 68 6 12 PABX call WANING EE 69 ES RINGING oirein eee a eebe eebe e oul cent cet 70 Fak Generalia enee 70 7 2 Stand alone ringers and alerting devices sss 70 7 3 Externally mounted devices dedege ege 71 TA A diblecha racteristieS sree a a ipeetnteediaseeens 71 7 5 Ringer sensitivity and Joadmg sss 71 7 5 1 General operation ease 71 7 5 2 Ringer sensitivity EE 72 7 5 3 Ringer ie a D EE 73 76 Ringingnumber CRIN WEE 73 7 7 Series Connected devices eee 73 7 7 1 EE Ee Inn EE 73 7 7 2 Devices without a terminating facility sese eee eee eee eee eee 74 7 1 3 Devices with terminating facility sees eee eee eee eee eee eee 76 7 7 4 Terminal equipment or extension porte 76 7 1 5 Locally generated ringing sss sese 76 T8 Ringer ON OFF SWOR tree eh 77 FEO Benke gege EE 77 8 AUTOMATIC CALL SET UP ANSWERING amp RECORDING FUNCTIONS 78 8 1 Automatic call set up and repeat calls nnnnnnnnnnnnnnnneneeeeerrr rrtt nnnennnnrr nnn enee 78 8 1 1 EE ege e a a e
32. features which are not included in the Sections of this Specification covering the main functional requirements 3 Section 11 of this Specification covers the additional requirements for products described in 1 and 2 above However due to the potential range of such features and also the continuing developments in technology it is always possible for features 17 PTC 200 May 2006 not to be specifically covered In such cases Access Standards will state the necessary requirements 4 Use of certain products or features described above may in some situations give rise to incompatibilities with other services and or customer products In such cases special conditions may need to be set for the grant of a Telepermit e There are many cases where an individual product satisfies Telepermit requirements for connection to a PSTN line when no other products are connected but fails to operated correctly when another Telepermitted item is also connected to the same line 5 It is a mandatory requirement for all Telepermit applications that a complete list of functions features for the product concerned be included This may be part of a test report or as a separate list associated with the application form 2 5 Variants of the same basic design 1 Where the same basic design particularly any electro acoustic aspects is common to a number of variants of a product the required sample of units may be selected from the range of models
33. follows a Telephony devices fitted with user controlled receive volume control shall comply with all mandatory requirements over the whole range of adjustment settings e Due to inherent noise and possible crosstalk on analogue lines it is undesirable for the range of receive gain to be excessive The typical range for gain is 6 10 dB b Any telephony device equipped with loudspeaking or handsfree facilities in addition to a handset shall comply with this Specification However only the handset function is normally required to be tested e Loudspeaking or handsfree functions are normally treated as market features Telephony products without handset facilities will each be treated on their individual merits and requirements should be discussed with Access Standards c Where Telephony devices are equipped with inductive couplers which comply with ITU T Rec P 370 it is strongly recommended that they be marked with the standard graphic symbol ref NZS 4121 1985 AS 1428 2 1992 and ITU T Rec E 121 e The capability to operate with inductive couplers and other such devices is regarded as a marketing feature and is not a mandatory requirement d For cordless devices the allocation of radio frequencies is administered by the Radio Operations Division of the Ministry of Economic Development ref clause 1 1 4 e Any non voice equipment capable of multiple soeeds and modulations such as a modem shall comply with the requi
34. for a pure tone signal of 5 dBPa at a frequency of 500 Hz with line currents of 20 mA and 80 mA b The total send harmonic distortion of any device transmitting recorded speech shall not exceed 10 for frequencies in the range 300 Hz to 3400 Hz c The total send harmonic distortion introduced by any non terminating series connected device shall not exceed 5 on a 1 kHz signal applied at a level of 4 dBm e The requirement stated in c above is designed to ensure that any distortion of signals including DTMF applied by the associated terminating device is within acceptable limits after passing through the series connected device Hence the send test level of 4 dBm which is the maximum permissible send level for DTMF tones from terminating devices see clause 5 2 2 2 The total receive harmonic distortion of any telephony device should be less than 6 for a pure tone signal of 10 dBV at a frequency of 500 Hz with line currents of 20 mA and 80 mA 3 The total sidetone harmonic distortion of any telephony device should be less than 10 for a pure tone signal of 5 dBPa at a frequency of 500 Hz with line currents of 20 mA and 80 mA 4 For digital PABX KTS systems distortion shall comply with the requirements of Specification PTC 109 Section 7 4 5 Line impedance of the device 4 5 1 Off hook line impedance 1 The objective off hook impedance of any device measured at the line terminals is complex and is represented by a
35. in separate related specifications Although most types of analogue CPE are covered telephony requirements are still very significant in network design because of the wide range of closely related transmission and signalling parameters which are involved This Specification includes the revised Loudness Rating requirements announced in 2002 These will help to provide reasonable expectation that an acceptable quality of conversation performance will be achieved for virtually all direct exchange line connections likely to be encountered in the Telecom PSTN This is especially important while the PSTN is progressively being converted to Voice over IP VoIP operation During this period calls will be carried over mixed circuit switched and packet switched networks Non voice devices work satisfactorily over most analogue connections but Telecom cannot guarantee operation over lines where voice communication is near its limit but still satisfactory This Specification includes provisions for key aspects only to be tested Other aspects affecting performance indirectly or in only a few network situations are not a part of the formal test requirement for the grant of a Telepermit Nevertheless for reliable operation under all circumstances these additional aspects need to be complied with The Telepermit system requires that suppliers accept responsibility for the quality and reliability of their products The granting of a Telepermit is not
36. normally aware that the message is being recorded and makes a definite decision to proceed 2 The Privacy Act 1993 contains additional constraints on the use of recording devices Use of a recording device to record a telephone conversation is deemed to be collection of personal information under this Act Generally speaking the Act requires that such collection shall only be carried out with the permission of the person concerned The Privacy Act also requires that the information be obtained from the individual concerned and sets strict conditions as to what information is being collected what it is to be used for and to whom it may be disclosed e While such issues are under the control of the user of the equipment it is important that suppliers remind users of their legal obligations in respect to the use of their products e Refer to the Privacy Act for full details 3 In view of the above legal obligations it is a mandatory requirement that the User Instructions for devices capable of recording two way conversations contain a warning notice as follows All persons using this device for recording telephone conversations shall comply with New Zealand law This requires that at least one party to the conversation is to be aware that it is being recorded In addition the Principles enumerated in the Privacy Act 1993 shall be complied with in respect to the 84 PTC 200 May 2006 nature of the personal information col
37. notes and shall be either included in the appropriate part of the User Documentation or contained in an attachment to the User Documentation c A full list of the warnings is given in clause 13 3 The appropriate warnings if any shall be listed in the Test Report under this clause see Appendix 3 of this Specification 13 3 User Documentation Warnings 1 The following is a list of the User Documentation Warnings Most are taken from the text of this Specification and in some circumstances additional warnings may be added where a circumstance is not covered by this Specification 2 Also there is a warning entitled General Warning which is applicable to all products and shall be included in the User Documentation in all cases 3 For the warnings taken from the text of this Specification the relevant clause number and heading is given for ease of reference General warning The grant of a Telepermit for any item of terminal equipment indicates only that Telecom has accepted that the item complies with minimum conditions for connection to its network It indicates no endorsement of the product by Telecom nor does it provide any sort of warranty Above all it provides no assurance that any item will work correctly in all respects with another item of Telepermitted equipment of a different make or model nor does it imply that any 101 PTC 200 May 2006 product is compatible with all of Telecom s network services W
38. of series connected and bridging devices 1 a b amp c On non terminating series connected and bridging devices the insertion loss is to be measured between the line port and terminal equipment port using 600 Q terminations on both the frequency generator and level measuring instrument Measurements shall be taken at 300 Hz 500 Hz 1000 Hz 2000 Hz 3000 Hz and 3400 Hz d Series connected devices in the terminating state shall be measured as above in the off hook condition 2 For proprietary interface devices the combination of terminal and series connected device shall be tested as in 4 9 1 and 4 9 2 or 4 9 3 as appropriate 4 10 Send and Receive Loudness Ratings telephony devices 1 2 amp 4 The telephony device is connected to the test equipment as shown in Fig A1 with RL set at a value of 600 Q resistive a line length of 0 km The tests are performed with line currents of 20 mA 45 mA and full current or 80 mA at the 14 frequencies f shown in Table 1 to obtain values for the send sensitivity Smjn and receive sensitivity Sjen of the line test circuit The send loudness rating SLR in dB is calculated from the following formula 10 14 SLR lt 0 175 logio gt 109 0175 Goin Wan n 1 where Wsn is the send weighting factor given in Table 1 Smjn is the send sensitivity of the line test circuit in dBV pa The receive loudness rating RLR in dB is calculated from the following fo
39. on fault procedure shall be included in the User Instructions Complies Yes No NA Connection Method for Externally Mounted Devices Devices designed for external use shall Not be plug connected Complies Yes No NA Have terminals suitable for connection of heavier weather resistant cable Complies Yes No NA SUPPLEMENTARY SERVICES amp SPECIAL FEATURES Analogue Calling Line Identification CLI Equipment On hook Impedance If on hook impedance is changed from that required by 4 5 2 during reception of data the following shall apply Impedance shall be restored to that required by 4 5 2 for the second ringing cadence Complies Yes No Yes No Yes No Yes No Yes No NA Yes No NA Yes No NA Yes No PTC 200 May 2006 11 1 6 147 If coded ringing is used unit shall decode the ringing to determine when the impedance should be applied and removed Yes No Complies Yes No At all times other than that covered by 1 above the impedance shall be as stated in 4 5 2 Yes No Complies Yes No Ringing On hook data transmission receivers shall be compatible with the requirements of Section 7 Yes No Complies Yes No Data Capture On hook data transmission receivers shall be capable of receiving data in the format described in Technical Document TNA 102 Section 10 in both SDMF amp MDMF message formats Yes No Complies Yes No If receiver is not capable of receiving data
40. port is any port on a series connected device to which a terminating device can be connected Terminating device is any device designed to terminate a PSTN line for the purpose of either initiating or answering calls over the network e See also Series connected device which can also be a terminating device e Certain products are capable of functioning as a terminating device or a non terminating device depending on the circumstances An example is a fax switch which answers a call and then extends the call to another terminating device Three wire connection refers to the plug and jack wiring arrangement used for connection of devices to the Telecom network using three wires the third shunt wire being used for ringer connection e This arrangement using a BT socket and plug to BS 6312 1985 was the standard method used between 1983 and 1996 for connection to the Telecom PSTN It involves the 3 wire connection of premises wiring between a master jack and a series of secondary jacks such that all devices connected are in a 3 wire parallel arrangement Through return loss is the degree of match between a reference impedance and the impedance of the line port of a series connected device when the terminal device port of the same device is terminated with an equivalent reference impedance e See also definitions of series connected device and return loss e The reference impedance referred to is normall
41. power failure of locally powered CPE the call shall be released Limit lt 5 sec Hold condition What type of Hold facility in use indicator is provided Limit comment required Hold condition time out Limit lt 3 min Hold current on 24V 400Q feed Limit gt 15mA Hold release shall occur within 500 ms under the following conditions 4500 resistive shunt Complies Yes or No Another device connected Complies Yes or No Disconnection of line current source Complies Yes or No On series connected auto dialling devices handover to associated device shall occur within 1 sec of last digit sent Limit lt 1000 ms Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No PTC 200 May 2006 6 6 6 7 6 9 6 9 1 6 9 4 138 Line breaks The duration of any undefined line break Limit lt 9ms ON Hook line current The total ON Hook d c current drawn by the device from the line Limit lt 120 uA Recall amp Call Waiting Is separate Call Waiting key provided If Yes what is length of break when invoked 300 lt Limit lt 800 ms The Timed Break Recall TBR invoked 300 lt Limit lt 800 ms Is the warning notice regarding TBR and or Call Waiting provided if less than 500 ms Series connected equipment D C line characteristics of series CPE Port to port voltage drop via each leg L
42. regeneration Confirm by functional test that device cannot be operated without security code 126 PTC 200 May 2006 11 SUPPLEMENTARY SERVICES AND SPECIAL FEATURES 11 1 Analogue Calling Line Identification equipment The test set up for testing the additional requirements below which are not covered elsewhere in this Specification is shown in Fig A9 25 Hz 80 V ringing generator Transmit level 13 dBm PC serial MODEM port Bell 202 Artificial line Ringing Detector RN 5 Set serial port 8 bits data 1 stop bit CSS Start DO D1 D2 D3 D4 D5 D6 D7 Stop Start Do D7 DO 0101 0101 5 5 hex 55 Notes Checksum 2 s complement of the modulo 256 sum of all words from the message type onwards Modulo 256 sum exclusive OR of each word 2 s complement X 00 X FIG A9 TEST SET UP FOR ANALOGUE CALLING LINE IDENTIFICATION EQUIPMENT 11 1 2 On hook impedance For this requirement the method of testing can best be determined by the Testing Authority 11 1 3 Ringing The ringing detector RN 5 should respond to ringing with the DUT across the line 11 1 4 Data capture 1 The CLI device shall be checked to ensure it responds to both SDMF and MDMF on hook data generated by the Bell 202 modem The data format is described in Technical document TNA 102 Section 10 127 PTC 200 May 2006 2 Response shall be checked for all four DA r
43. shall be in a format as close as practicable to that given in the Test Schedule shown in Appendix 3 of this Specification All tests shall be addressed stating NA where a test is not applicable 3 Photocopies of original Test Reports shall be accompanied by either colour photographs or colour photocopies of the product 4 In cases where equipment has been previously tested on behalf of another Telecommunications Authority the resultant test results may be submitted to Telecom as additional support for a Telepermit application Such test results must be relevant to 22 PTC 200 May 2006 the appropriate PTC Specification requirements for them to be considered for the grant of a Telepermit In general Authorities compliance certificates alone are not sufficient for acceptance e Test reports provided by overseas testing laboratories may provide more or less detail than is required by this Specification Such reports are acceptable as supporting evidence but additional tests to cover any Telecom requirements which differ from such standards may have to be carried out e A composite Test Report to the required format is to be supplied but this may be prepared from several other separate reports 2 12 Multi function and series connected equipment 2 12 1 Types of signal 1 There are four main types of signal which are passed between customer equipment and the PSTN the requirements for which are each covered separately in subseq
44. shall be such that the return loss complies with sub clause 4 5 1 8 b Each individual signalling tone of a burst when measured against 6 00Ohms on a zero length line shall be at a power level between 4 dBm and 13 dBm c For successful operation of DTMF signalling between customer premises it is recommended that DTMF send levels be in the range 4 dBm to 10 dBm d There shall be a pre emphasis in the range 1 to 3 dB for the high frequency tone group relative to the low frequency group e During DTMF signalling any individual distortion or intermodulation products shall comply with clause 4 3 2 2 5 2 3 Signal timing The duration of transmitted DTMF signals shall comply with the following requirements a The minimum valid tone duration shall be 60 ms and the minimum inter digital pause shall also be 60 ms exclusive of any rise and fall times b The valid tone duration shall be timed when the signal is within the acceptable tolerances stated in clauses 5 2 1 and 5 2 2 c The inter digital pause shall be measured following rapid successive operation of any of the DTMF keys e Even if buffering of manually operated DTMF signals is not provided the minimum tone duration is still likely to be around 60 ms 5 2 4 Series connected equipment 1 Any harmonic distortion of DTMF signals introduced by series connected devices shall not exceed 5 2 For terminating series connected devices any DTMF signallin
45. should meet requirements before a Telepermit can be granted 2 Telecom however reserves the right to call for larger samples to be tested if the test results and or other information supplied indicate doubtful compliance If considered necessary Telecom will call for a sample of 20 units to be tested against selected clauses of Section 4 and an acceptable quality level AQL of 10 defective ref British Standard BS 6002 will be used to determine acceptability 3 Should test results indicate that a sample made up of two or more types of telephone claimed to be electro acoustically identical actually consists of differently performing designs the Testing Authority shall arrange for additional units to be provided by the Applicant to make up the full sample of each type A1 2 2 Other devices 1 Asample of one unit of non telephony devices shall be submitted to a recognised Testing Authority for testing against this Specification 2 Also at the discretion of Access Standards for more complex or specialised telephony devices testing of only one unit may be accepted 106 PTC 200 May 2006 PTC 200 APPENDIX 2 TEST PROCEDURES A2 1 GENERAL CONDITIONS FOR TESTING 1 Unless otherwise stated in this Specification the tests are to be carried out under the normal operating conditions of connection to the Telecom network and with the equipment operating as intended 2 All claimed product functions requiring compliance wit
46. signal a break equal to the TBR signal If a separate call waiting key is provided it shall either provide the same facility as the TBR or be rendered inoperable and suitable mention made in the User Instructions 3 Where provided the TBR of customer products shall be within the range 300 ms to 800 ms If a product cannot be set to operate within this range then the TBR function shall be disabled Also a suitable explanation shall be inserted in the User Instructions advising users that the facility is not available 4 For the highest probability of correct operation in all situations TBR should be within the range 500 650 ms e Following investigations it has been found that there are a number of earlier exchanges which require TBR to be within 500 800 ms to ensure consistent and reliable operation e While most modern PABXs will accept a lower TBR on their extension ports some earlier PABX products many of which are still in service require that TBR be in the range 300 650 ms 5 Since 100 certainty of operation cannot be guaranteed for products with TBR of less than the preferred minimum the following warning notice shall be included in the User Instructions for all products providing a TBR of less than 500 ms The recall facility of this product may not always operate correctly on some parts of the Telecom network or on some PABXs available on the market If this is the case then recall can be activated
47. the same number for each manual operation e Any device which makes more than one call attempt to the same number is classified as an automatic calling device and is covered separately in Section 8 3 The user instructions associated with any automatic dialling equipment shall clearly state the following This equipment shall not be set up to make automatic calls to the Telecom 111 Emergency Service e This warning notice also appears under section 8 1 7 of this specification entitled User Instructions Test Laboratories need not apply the same warning notice twice to items of CPE 4 Equipment designed for automatic dialling shall be capable of having the called numbers re programmed or edited This may take the form of installer programming locally or from an external source internal software programming or associated DTMF keypad for the purpose of manually editing individual programmed numbers e It is sometimes necessary to insert prefix digits additional to the number programmed see clause 5 6 2 below 5 Where an adjunct unit has an integral keypad it shall be regarded for dialling purposes as equivalent to CPE with an integral display unit 6 When dialling a local number only the 7 digit number shown in the directory needs to be dialled Nevertheless a customer may dial the 0 and the area code for a local call wholly within the Telecom network This does NOT incur a toll charge 7 Sho
48. the RN rating determined in g above connected in parallel with a 10 kOhms resistor shall not cause ring trip e Clause 6 10 5 a describes off hook ring trip conditions i Ringing cadences used should preferably be in accordance with those stated in Technical Document TNA 102 clause 6 4 with a tolerance of 10 The preferred cadence is DA1 e Some CPE may only respond to DAT e This requirement relates particularly to use of terminating devices designed to respond to distinctive alert cadences j If the ringing cadence used is not in accordance with TNA 102 the following warning notice shall be included in the User Instructions Devices designed to respond to particular ringing cadences may not respond when used with this equipment 7 8 Ringer ON OFF switch Control switches for the ringer are permissible as a means of allowing a greater number of CPE items to be connected to the same line without exceeding the ringing loading e The provision of a ringer ON OFF switch is regarded as a marketing feature 7 9 Bell tinkle Reference clause 7 5 2 4 for requirements 78 PTC 200 May 2006 8 AUTOMATIC CALL SET UP ANSWERING amp RECORDING FUNCTIONS 8 1 Automatic call set up and repeat calls 8 1 1 General This clause covers the calling requirements for equipment which is programmed to both automatically initiate and dial up predetermined calls It is not intended to cover manually initiated functions such as
49. the following warning notice shall be included in the User Manual This equipment does not fully meet Telecom s impedance requirements Performance limitations may occur when used in conjunction with some parts of the network Telecom will accept no responsibility should difficulties arise in such circumstances 5 The relaxed requirements for the minimum return loss of non voice devices are as follows subject to the condition stated in sub clause 4 above a Minimum return loss measured against the reference impedance BT3 shall be at least 8 dB at any frequency in the band 300 to 3400 Hz or b minimum return loss measured against an impedance of 600 Ohms shall be at least 16 dB at any frequency in the band 300 to 3400 Hz or c minimum return loss measured against a reference network made up from a 220 Ohms resistor in series with a parallel combination of an 820 Ohms resistor and a 120 nF capacitor shall be at least i 10 dB at any frequency in the band 300 to 600 Hz and ii 15 dB at any frequency in the band 600 to 3400 Hz e The impedance described in c is the ACIF objective requirement 42 PTC 200 May 2006 e Suppliers should note that any equipment complying only under these relaxed conditions may give trouble when used in conjunction with some parts of the network Telecom will accept no responsibility should difficulties arise in such circumstances Suppliers are advised to monitor the performance of the
50. the purposes of this Specification noise also includes unwanted electrical energy at frequencies outside the normal speech band of 300 Hz to 3400 Hz Non terminating device is a series connected device which is not capable of originating or answering a call when connected to the PSTN and is associated with a separate terminating device e See also definition of series connected device Off hook is the condition where the equipment is connected to line and is used to initiate or take part in a call sometimes referred to as on line On hook is the condition where the equipment is connected to line in the idle state awaiting receipt of an incoming call or available to initiate a call sometimes referred to as off line e The above terms are derived from the term hookswitch which is used to describe any device which changes the status of the equipment from on hook to off hook or vice versa PABX is a form of telecommunications system designed for use in a customer s premises which provides full switching facilities between individual extension devices and the Telecom PSTN e For the purposes of defining interface requirements a PABX system may be considered to provide a similar range of conditions to that of a public exchange line 31 PTC 200 May 2006 e For the purposes of this and other PTC Specifications and TNA documents the term PABX embraces all Private Automatic Branch Exchange PABX Key Telep
51. transmission facility provides for the display of the calling telephone number on the called party s terminal equipment e Otherwise known as calling line identification e On hook data transmission and Analogue Calling Line Identification Presentation Analogue CLIP are described in Technical Document TNA 102 CNG Tone calling tone Is an interrupted tone 1100 Hz transmitted by automatic calling non voice equipment e Reference ITU T Recommendation T 30 1993 dBmP is the absolute psophometric power level with respect to 1 mW expressed in decibels See also the separate definition of psophometric e Psophometric weighting for use on telephone type circuits is as indicated in ITU T Recommendation 0 41 dBm0OP is the absolute psophometric power level expressed in decibels with reference to a point of zero relative level i e 0 dBr point dBPa is the absolute sound pressure level with respect to 1 Pa expressed in decibels dBr is the relative power level at a given point on a circuit with reference to a point of zero relative level i e 0 dBr point e Digital codecs used in the Telecom network are defined as 0 dBr points ref ITU T Recommendation P 66 1993 Clause 3 27 PTC 200 May 2006 dBV is the absolute voltage level with respect to 1 V expressed in decibels Distinctive Alerts DA are the four different ringing cadences DA1 to DA4 used on PSTN lines and which may be used as
52. up for through transmission but which provide a line termination shall have an insertion loss of no more than 3 dB at all frequencies in the off hook condition e 1 OB insertion loss will be required wherever it is considered reasonable to do so e Many series connected devices are capable of performing a terminating function and a non terminating function at different times during the same call ref clause 2 12 For this reason the terms are used to describe the state rather than the device even though they can serve to describe some devices 4 9 5 Bridging devices The maximum insertion loss for bridging devices shall be 1 dB at all frequencies in the range 300 3400 Hz 4 10 Send and Receive Loudness Ratings SLR amp RLR 1 The transmission performance of telephony devices shall be assessed in terms of ITU T IRS Loudness Ratings in accordance with Recommendations P 64 1993 P 65 1993 and P 79 1993 The test arrangements are given in Appendix 2 2 Loudness ratings shall be assessed by taking measurements at 14 separate frequencies and weighting the results appropriately For 14 frequency measurements the frequencies and their weightings are given in Table 1 of Appendix 2 3 The aim is that if a telephony device is set to the SLR and RLR limits stated below when connected to the Telecom PSTN the combined performance of that device and the network will satisfy ITU T Rec G 111 1993 and Rec G 121 1993 e R
53. waiting PABXs providing 100 V d c signal for call waiting shall comply with the requirements of Specification PTC101 Complies Yes No RINGING General Is the device Equipped with Type1 Type2 or both decoder functions Specify or N A Stand alone ringers and alerting devices The stand alone ringer for interior use shall be capable of BT plug connection Complies Yes No If fitted with integral capacitor is BT plug wired across pins 2 amp 5 If Shunt wire used plug shall be wired to pins 2 amp 4 Complies Yes No Externally mounted devices All new equipment mounted externally shall incorporate the following 2 wire connection with a capacitor of value not greater than 1uF Complies Yes No Screw or IDC terminals Complies Yes No Weather resistant cable access Complies Yes No Audible characteristics The sound level of the audible sounder 1 m away from the ringer source Limit gt 50 dBA Ringer sensitivity and loading General operation of the ringer Is the sensitivity and loading clauses 7 5 2 amp 7 5 3 satisfactory for all four cadences DA1 4 If No is this indicated by a warning notice in the User Instructions PTC 200 May 2006 Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No 4i 4ii 7 5 2 1 7 5 3 7 6 1 2 7 7 7 7 1 141 The DA1 4 cadence decoding duration from the moment the
54. 1 The concept of a naive user was introduced by Telecom to cover any member of the general public who does not have specialised terminal equipment or knowledge e Reference British Standard 6789 1987 Section 3 2 2 This Specification is intended to provide a degree of protection for such naive users so that they may purchase with reasonable confidence any equipment which has been granted a Telepermit by Telecom 3 Naive users should not be misled or disadvantaged by equipment which is connected to the Telecom network by other persons Such problems would occur in the event that inadequate operating procedures or other design deficiencies lead to users being charged for ineffective calls 4 Calls from ordinary customers having only telephone facilities may be inadvertently routed to automatic non voice answering equipment This may result in a chargeable but ineffective call e To minimise this problem voice messaging back up is recommended 5 The correct operation of non voice communications requires that both calling and called parties have compatible terminal equipment As such neither is regarded as a naive user for this class of call Nevertheless calls from customers having only telephone facilities may be inadvertently routed to automatic answering non voice equipment or such equipment may call an ordinary customer or naive user in error In such cases it is important that such customers are not subjected to nuisance
55. 2 This applies to both 2 wire and 3 wire devices 7 6 Ringing number RN 1 The ringing number RN allocated shall be in the range 0 5 5 and shall be equal to the higher of the following a Ringer sensitivity number ref clause 7 5 2 b Ringer loading number ref clause 7 5 3 2 If the RN derived as above equates to zero then it shall be rounded up to 0 5 e Telecom reserves the right to increase the value of RN above that derived in 1 and 2 if other factors such as excessive on hook d c indicate the need However this is expected to occur in only rare and exceptional cases 3 For correct operation the total of the RN s of all devices connected to a PSTN line at any given time should not exceed 5 e Note that the RN assessment is not intended to be an accurate measurement but is primarily a simple guide to customers as to the total number of items they may connect to a line 4 Where equipment is not intended to be connected to a line in parallel with other terminal equipment this shall be clearly stated in the user instructions e Some items of series connected equipment do not normally have other devices connected in parallel with their PSTN line port In cases where this possibility is envisaged then the factors influencing the RN should be considered in the design 7 7 Series connected devices e See clause 2 12 and Fig 7 2 for explanation of series connected devices 7 7 1 General re
56. 6 way North American modular plug and socket is recommended where only 2 pair or 3 pair cable is installed 3 It is strongly recommended that the BT plug and socket arrangement is not used for either of the above applications This will avoid the confusion of PSTN telephones or other devices having BT plugs being incorrectly connected to the wrong interface 91 PTC 200 May 2006 11 SUPPLEMENTARY SERVICES AND SPECIAL FEATURES 11 1 Analogue Calling Line Identification CLI equipment 11 1 1 General 1 Analogue CLI equipment designed for the Telecom Caller Display service uses the on hook data transmission facilities described in Technical Document TNA 102 Sections 10 and 11 2 The basic on hook requirements stated in this Specification apply to analogue CLI equipment except where specifically stated in the following clauses Also there are certain requirements and design considerations which are not covered elsewhere in this Specification The following clauses detail these additional requirements and also include some general requirements for on hook data transmission devices which could be used for future services Fig 11 2 shows the test set up for these additional requirements for analogue CLI devices 3 Where the CLI receiver is incorporated in other customer equipment covered by this Specification then the normal overall requirements for that type of equipment will apply along with the following additional requirement
57. 78 8 1 2 Sie E 78 8 1 3 Automatic re attempts to the same number 78 8 1 4 Automatic calls to different numbers sss sese 79 8 1 5 Termination of failed call attempts eee eee 79 8 1 6 Call identification phase 79 8 1 7 USEF IMSUUGCIONS E 80 8 1 87 Hee e lne EE 80 8 2 Automatic answering equipment eee eee 81 8 2 1 Call answering DEE 81 8 2 2 Voice announcements and recognition tones see 82 8 9 Remote interrogations aenesenenenenene eaea ea ees 82 OA e TE 82 8 5 Recording TUNGUONS eck calito ee ht ah eae hana eet Ee 83 9 BILLING SECURITY EE 85 G H ss EEN 85 9 2 Security codes for cordless devices AA 85 10 NETWORK CONNECTION eee 87 10 1 KEE ale le DEES 87 10 2 Connection methods 87 5 PTC 200 May 2006 10 3 Series connected devices eee 88 10 3 1 Line grabbing ele le ee 88 Re SN Ei EE 88 RE WR GU ee 89 10 4 Connection method for externally mounted devices AAA 89 10 5 Other jackpoint Connections sss eee eee eee eee eee 90 11 SUPPLEMENTARY SERVICES AND SPECIAL FEATURES nsan 91 11 1 Analogue Calling Line Identification CLI equipment 91 HPs el e 91 1 N WE ee ele lune Tn eiere ieie eee enese eee eeto nt tiea g eee 92 IES RINING EE 93 1114 RER EE 93 11 1 5 Number format passed from the network eee eee 94 KENE SR Ee e 95 11 1 7 Data e e es xo5 soe ase a ne a a aa es ee as a ec ee anana 96 11 1 8 Dial back Gorete sees 97 12 PHYSICAL CONSTRUCTION AND MODIFICATIONS sxs sexe eee eee 98 n E NEE Ee S Te
58. ELES souepeduy EIST L souepedu vue SOMOS julodyoer JIM Z UOIMS gouepey ZAG dy Fig A8 TEST SET UP FOR SERIES RINGING DEVICES 124 PTC 200 May 2006 7 7 Series connected devices 7 7 1 General requirements See clause 7 5 1 When measuring ringing parameters of a series device the aim is to assign an RN to the device in such a way that the rules for adding RNs up to a maximum of 5 still apply This means that the maximum applies to devices on both the load side and the network side of the device plus the RN of the series device itself 7 7 2 Devices without terminating facility 1 a The test set up for determining the RN is shown in Fig A8 The set up shall be calibrated as follows i Close all switches Sw1 to Sw10 leaving switches SwA to SwJ open ii Adjust the variable resistor until V 107 Vp p e Itis important that this V is a true peak to peak measurement and not calculated from an r m s measurement as most ringers only conduct over part of the waveform b Open all switches Sw1 to Sw10 Close switches SwA to SwJ one by one until the peak to peak voltage V falls below 107 Vp p and then re open one switch The maximum load Lry which represents the total RN that can be connected to the terminal equipment port of the device is determined as follows LRN number of switches closed 2 Result must equal no less than 4 2 4 For devices which do not incorporate
59. Equipment goes off hook after say 3 4 seconds of commencement of incoming ringing at this point charging for the call begins b Within 500 ms of going off hook the equipment returns three tones e g 256 Hz for 400 ms 100 ms silence 304 Hz for 400 ms 100 ms silence and then 383 Hz for 600 ms this corresponds to the first three notes of a C minor chord An alternative to the three tones is a voice message instructing the calling party as appropriate c The equipment then returns the North American ringing tone cadence of one second of 400 Hz followed by a 3 second gap all repeated up to 5 times During this period the equipment monitors the incoming call for any tones such as CNG fax or DTMF answerphone to determine the correct destination of the call d If the call has not been successfully dealt with within 5 cadences the equipment sends a single tone of say 1800 Hz for 200 ms then terminates the call Alternatively it is acceptable for the switch to divert the call to the fax machine at this point on the basis that the originating call may have been from a manual fax machine which would not send CNG tone 8 3 Remote interrogation Facilities for the interrogation and remote control of automatic answering equipment by a remote device are acceptable but are regarded as marketing features The remote device shall satisfy the Telepermit requirements applicable to its normal functions 8 4 Call release 1 All equipment whi
60. MR against the Telecom network terminating impedance BT3 does provide some measure of sidetone performance e Zs0 is also sometimes known as the minimum sidetone line impedance e Traditionally the ZsO of telephones has been considerably more reactive than BT3 in order to match more closely the combination of long cable pair connections in the local loop and the exchange impedance This is no longer favoured due to the rapidly increasing number of short cable connections being used 49 PTC 200 May 2006 4 11 3 Sidetone Masking Rating STMR 1 STMR shall be measured separately against the two impedances 600 Ohms and the Telecom network line terminating impedance BT3 2 The value shall be no less than 7 dB against BT3 3 It is preferred that STMR also be no less than 7 dB against 600 Ohms e Measurement against two different impedances provides a better understanding of the likely sidetone performance when installed in practical conditions s This test requirement does not include use of an artificial line 4 12 Instability 1 All devices shall be stable under any normal range of conditions when connected to a PSTN line 2 Telephony devices shall be tested using the test set up shown in Fig 4 1 with the handset placed face down on a hard flat surface it shall not be possible under any condition to induce an audible oscillation in the telephone when terminated by the following impedance networks a a 270 Ohms re
61. Specification PTC 200 Requirements for Connection of Customer Equipment to Analogue Lines Access Standards Telecom New Zealand Limited Wellington New Zealand May 2006 2 PTC 200 May 2006 Table of Contents MAD Gs eG e an 2 RELATED TELECOM DOCUMENTS ee dere geseet ESTO 6 REFERENCE DOCUMENTS including later amendmente sss sese 6 POREWORD EE 7 TELECOM DISCLAIMER ee 9 T SCOPE EE 10 1 1 Equipment types and associated Specifications sse eee 10 1 2 Electromagnetic interference EMI eee eee 11 1 2 1 Radiated energy requirement sss 11 1 2 2 Immunity from radiated energy 11 1 3 E e Ee e EE 11 TA SEE XCIISIONS E 12 1 5 Compliance with International standarde eee eee eee 12 1 6 Temporary relaxatloms E 12 1 7 Mandatory requirement eee eee 12 1 8 Exemptions from full compliance eee eee eee eee 12 t9 Warning R e Ree EE 13 1 10 Non compliance aspechs eee 13 1 11 E leie Ener 14 1 12 Product and service compatibility AAA 14 1 13 Ongoing complian E E 14 PAE E EE 16 2 1 Mode of TI TEE 16 22 Related SpecificatioNS E 16 2 3 Marketing WEE 16 2 4 Specialised services amp features sse 16 2 5 Variants of the same basic design 17 2 6 Disabling of prohibited features sese 17 2 e EE 18 2 0 _ e enle T e EE 19 2 8 1 Genel al AE E AEA AE ATA AE EAE EAEE OEA EAEE EOE 19 2 8 2 External power Supplies eee eee eee 19 2 8 3 Plug in Cards or modules isien ea a EEA DEA RERA 19 2 8 4 Earth connections eee 19
62. Such cases must be fully represented giving all details and each case will be treated on its individual merits b For signals of less than 5 seconds duration the level of individual tones shall not exceed 4 dBm e Speech signals from a telephone instrument conforming to this Specification will typically have a nominal level of 12 dBm measured against 600 ohms when averaged over three seconds e Automatically generated DTMF signals are subject to this requirement see clause 5 2 2 Manually generated DTMF signals since they are under the direct control of the user cannot be easily restricted or measured However it is assumed that any individual DTMF digit is unlikely to exceed 5 seconds c The maximum instantaneous peak power of any transmitted signal measured 38 PTC 200 May 2006 across an impedance of 600 Ohms shall not exceed a level that corresponds to that of a sine wave of 0 dBm e Transient voice peaks may be as high as 12 dBm These because they are very brief do not normally exceed the limit in 1 c above 2 On any telephony device it shall not be possible to generate a signal exceeding 10 dBV rms across a 600 Ohms termination for any acoustic stimulus at the microphone e This requirement relates to the limit set on line signals such that potential interference to other Telecom customers due to crosstalk is minimised 3 Any recorded message or voice signal transmitted into the Telecom PSTN shall be
63. This impedance shall be removed either when the second ring cadence occurs preferably just before or when another device on the same line goes off hook b If coded ringing is implemented on the same line the unit shall also decode the ringing to determine when the impedance should be applied and removed e There is potential for confusion between DA2 and DA4 because of the extended silent period between the first two bursts of ringing e The difference should be noted between the standard Telecom New Zealand oft book impedance BT3 ref clause 4 5 1 and the 600 Ohms plus 2 16 UF series network commonly used on North American products However it is not anticipated that this difference will cause any problems for on hook data transmission 2 At all other times the on hook impedance shall be as stated in clause 4 5 2 93 PTC 200 May 2006 11 1 3 Ringing 1 The four ringing cadences DA1 DA4 used on PSTN lines are described in Section 6 of Technical Document TNA 102 and the requirements for response to these cadences are detailed in Section 7 of this Specification On hook data when available will be capable of being transmitted on all four cadences 2 It should be noted that due to the difference in cadences there is less time available for data transmission than the nominal 4 seconds available in North America This limits the amount of data that can be sent particularly for cadences DA3 and DA4 but this should not impac
64. URRENT Rg of 0 5 mm ARTIFICIAL LINE Full current max 80 mA 400 Q 0 km 45 mA 400 350 O 2 km 30 mA 400 850 O 5 km 25 mA 400 1350 Q 8 km 20 mA 400 1750 Q 10 km e The above are approximately equivalent only e There is no requirement to test above 80 mA If full current is greater than 80 mA it may be adjusted down to that value by increasing the value of R 12 Simple functional tests may be carried out to ensure that the equipment is operational to the extent that calls may be initiated answered and terminated reliably under a typical range of line conditions and to confirm that the basic functions of the equipment can be demonstrated Only used for 3 wire devices gt 400 uF TEST DEVICE INSTRUMENT ARTIFICIAL 2 WIRE UNDER or LINE JACKPOINT SIGNAL 0 3 6km TEST GENERATOR see Fig A1 b R as specified for particular test MINN gt S Zen Rg 400 xz 5 gt 10 H where x value necessary to achieve specified line current 50 V Rs Note The 400 Z includes total resistance of inductors FIG A1 a TEST SET UP 422 12 5 nF T T 12 5 nF 42 FIG A1 b ARTIFICIAL LINE SEGMENT 0 5 km Line Length 108 PTC 200 May 2006 A2 2 TEST SET UP PROCEDURES A2 2 1 This Specification covers a wide range of equipment types and actual tests required will vary from item to item The Testing Authority will have to use some discretion in defining the test programme necessary for each case This will d
65. W Cadence Switch 804 ns 0 5 pF 25 Hz Sinusoidal d Voip Rin ging Voltage FIG 7 1 TEST SET UP FOR RN ASSESSMENT 3 Telephony devices shall be tested for ringing detector response to applied ringing of 40 ms duration If a ringing detector does respond then the following warning notice shall be included in the user instructions This device may be subject to ringing or bell tinkle when certain other devices are connected to the same line If this occurs the problem should not be referred to the Telecom Faults Service 73 PTC 200 May 2006 e A typical example of this problem may arise if a customer uses the device in conjunction with a fax machine and Telecom s Faxability service 4 Devices shall be tested for impulse immunity from any parallel connected device If a ringing detector does respond to impulses then the following warning notice shall be included in the user instructions This device may be subject to ringing or bell tinkle when calls are made from another device on the same line If this occurs the problem should not be referred to the Telecom Faults Service 7 5 3 Ringer loading As for ringer sensitivity all ringing detectors shall be assigned a ringer loading RL number on a scale of 0 5 which shall be determined using the test set up shown in Fig 7 1 The method used for determining this ringer loading number is described in detail in Appendix
66. a complete list of warning notices is given in Section 13 Each notice is referenced to the relevant clause in the text 2 To fail to pass on this information may be in breach of the Consumer Guarantees Act 1993 and may result in the Telepermit holder being liable to compensate the user for any Telecom call out charges 3 It is recommended that all warning notices in the User Manual be incorporated either in one place or preferably at the appropriate places within the text This reduces the risk of the information being overlooked e These warnings assist both the supplier and the user as they explain what is required or what restrictions apply to the product in service As such they inform the user and are also likely to protect the supplier under the Consumer Guarantees Act 1 12 Product and service compatibility 1 This Specification deals with Telecom s requirements for ensuring compatibility with the basic functions of its network As such the granting of a Telepermit does not necessarily imply that a product is compatible with all of Telecom s supplementary services Similarly any two products which have been granted Telepermits are not necessarily fully compatible with one another e As at January 2004 some 8000 items have been granted Telepermits and these cover a wide range of products Similarly the range and number of Telecom s network services are being progressively increased 2 Some common potential CPE inco
67. a ring detector HN is derived as follows RNL RL 5 Lrn Measure RN of the device with switches SwA to SwJ open as per clause 7 6 This value is defined as RNo The RN of the device is defined as the higher of the values RN and RNo Ringing Numbers of zero are rounded up to 0 5 5 If a device incorporates a ring detector RN is derived as follows a For devices which switch to the load on the terminal equipment port only after analysis of ringing has been completed e g distinctive alert decoders RN shall be determined by assessing ringer sensitivity and loading as in 7 5 and 7 6 with the load disconnected SwA to SwJ open b To determine the sensitivity of the ringer on devices which respond to ringing with the load connected to the terminal equipment port check that it does operate with Lrn loads connected as determined in 1 above If not reduce Lou by opening switches SwA to SwJ one by one until the ringer operates according to the criteria of 7 5 1 125 PTC 200 May 2006 HN is then derived as follows LRN number of switches closed 2 RN RS 5 Len c Measure RN of the device with switches SwA to SwJ open as per clause 7 6 This value is defined as RNo The RN of the device is defined as the higher of the values RN and RNo Ringing Numbers of zero are rounded up to 0 5 e The following information will be indicated on the PTC label a Maximum aggregated RN which can be connected to the t
68. al digits manually in addition to those dialled by an automatic dialling device Usually this will be carried out from an associated telephone Use of such arrangements may give rise to the following difficulties a If both the adjunct automatic dialling unit and the associated telephone draw current from the line there may be insufficient current available to power both devices b If both devices terminate the line the combined impedance of the two devices is unlikely to meet the requirements of clause 4 5 e This is acceptable for a limited period before actual speech transmission takes place provided that the automatic dialling device goes on hook as soon as dialling is completed e From a user viewpoint the need to manually dial part of the number via the telephone is not very convenient Also if the two devices are connected in parallel rather than series then the sound level from the receiver may be objectionable when the display unit is dialling the remaining digits series connected devices are required to comply with the speech path suppression requirements of clause 5 2 5 c Adjunct dialling units use DTMF signalling and can therefore only be used in conjunction with DTMF telephones 58 PTC 200 May 2006 e See also clause 5 1 3 e These potential problems are likely to result in complaints from users and possibly product returns d An adjunct dialling unit is unlikely to be able to suppress the speech performanc
69. al hardware to be used or ii The necessary hardware shall be supplied with the equipment concerned b The equipment connection shall be such that it ensures connection of other socket terminations across the line in the idle condition e A typical example of such equipment is an alarm system designed to make calls in an emergency 10 3 2 Handover 1 A device may plug into a Telecom socket and provide its own extension socket Another item of equipment plugged into that socket usually a telephone is used to establish a call Once the call has been established the equipment usually under manual control will then grab the Telecom line from the secondary device and continue with the same call 89 PTC 200 May 2006 2 During a handover process any d c break shall be no greater than 9 ms 3 One of the following alternatives shall apply a The appropriate requirements for 3 wire connection as detailed in clauses 10 2 and 10 4 of this Specification shall be complied with or b If a 2 wire socket to clause 10 3 is used the User Manual shall contain a warning to the effect that not all telephones will respond to incoming ringing when connected to the extension socket A common example of this arrangement is a dedicated telephone connected to the extension socket of a modem or facsimile machine preferably with no other equipment connected to the same line e Where any Telepermitted device may be associated with the port
70. amental network differences As a result it is not possible for Access Standards to accept test reports to ACIF specifications without the differences in the standards being fully addressed 1 6 Temporary relaxations The requirements of this Specification apply from the date of publication All earlier relaxations in Specifications PTC 202 PTC 211 and PTC 212 have now expired including those given for telephones in the draft Issue 2 of Specification PTC 202 1 7 Mandatory requirements 1 All mandatory requirements of this Specification are denoted by use of the word shall and are highlighted by shading for ease of identification 2 The requirements of such clauses are also included in the test schedule detailed in Appendix 3 These requirements will in general be regarded as the minimum requirements for the grant of a Telepermit e Appendix 3 also includes some tests of requirements which although not mandatory are required for information and comparison purposes 1 8 Exemptions from full compliance 1 Notwithstanding the statement in clause 1 7 above Access Standards reserves the right to grant exemptions to any mandatory requirements of this Specification where considered appropriate Most such exemptions will be in the category of professional equipment or equipment designed for users with special needs Other typical examples are a Closed systems where one or more dialling devices call special answering
71. amp Off Hook limits gt 40 dB Frequency Response Send Frequency response Limit plot within mask Receive Frequency response Limit plot within mask For non voice equipment Capability of automatic reduction of the transmitted signal bandwith eg fall back Limit successful operation Warning notice in User Instructions For series connected and bridging CPE Minimum Insertion Loss for 2 wire series connected device in non terminating state while the terminating device is off hook Limit lt 1 dB Insertion Loss for 4 wire series connected device in non terminating state while the terminating device is off hook 2dB lt Limit lt 3 dB Minimum Insertion Loss for series connected device with line termination but in through transmission state with the terminating device off hook Limit lt 3 dB Minimum Insertion loss of bridging device Limit lt 1dB Yes No Yes No Yes No NA Yes No NA PTC 200 May 2006 4 10 4a 4 11 3 1 2 4 12 1 2a 2b 4 13 4 14 1 4 15 1 133 Send and Receive Loudness Rating Send Loudness Rating vs current 20 mA 45 mA 80 mA 8 dB lt Limit lt 2 dB Receive Loudness Rating vs current Without Volume Cont or with Vol Cont on min setting 20 mA 45 mA 80 mA 3 5 dB lt Limit lt 9 5 dB With Vol Cont on max setting 20 mA 45 mA 80 mA Limit lt 14 dB Sidetone Sidetone Maski
72. an acceptance of such responsibilities by Telecom nor is it an endorsement of that product by Telecom It is simply a public statement that the product concerned may be lawfully connected to the Telecom network Under New Zealand consumer legislation suppliers have legal responsibilities to ensure that their products are suitable for their intended purpose As such they are responsible for ensuring that any conditions relating to the grant of a Telepermit are made known to their customers PTC 200 May 2006 9 PTC 200 May 2006 TELECOM DISCLAIMER Telecom makes no representation or warranty express or implied with respect to the sufficiency accuracy or utility of any information or opinion contained in this Specification Telecom expressly advises that any use of or reliance on such information is at the risk of the person concerned Telecom shall not be liable for any loss including consequential loss damage or injury incurred by any person or organisation arising out of the sufficiency accuracy or utility of any such information or opinion The grant of a Telepermit for any item of terminal equipment indicates only that Telecom has accepted that the item complies with minimum conditions for connection to its network It indicates no endorsement of the product by Telecom nor does it provide any sort of warranty Above all it provides no assurance that any item will work correctly in all respects with another item of Telepermitted eq
73. arded primarily as function descriptions rather than equipment descriptions e An example of a multifunction device is a fax machine which responds to distinctive alert signals i e Telecom e Faxability service 25 PTC 200 May 2006 3 DEFINITIONS 3 1 General 1 In general definitions set by the International Telecommunications Union and published in the ITU T Recommendations apply throughout this Specification Nevertheless some ITU T definitions are not particularly informative for those unfamiliar with telecommunications engineering In the circumstances the following definitions are supplemented by explanatory paragraphs which elaborate on the formal wording 2 Additional definitions are provided in Specifications PTC 100 AS NZS 60950 and TNA 102 Nevertheless some definitions are repeated in this Specification in order to explain aspects which directly relate to its requirements Acoustic stability is the ability of a telephone device to prevent oscillations occurring when sound waves from the earpiece are fed back into the mouthpiece e Such feedback can occur when a telephone handset is placed face down on a hard flat surface Answering machine is any form of automatic device whether stand alone or integrated into some other class of equipment which provides facilities to answer a call without human intervention e Answering machines and telephone instruments are now often combined into a single integrated ite
74. arnings taken from Specification text 2 11 1 Compliance testing 6 amp 7 Functional tests Typical warning for 56 kbit s modems as an example This equipment is not capable under all operating conditions of correct operation at the higher speeds for which it is designed Telecom will accept no responsibility should difficulties arise in such circumstances 4 5 1 Off hook line impedance 4 This equipment does not fully meet Telecom s impedance requirements Performance limitations may occur when used in conjunction with some parts of the network Telecom will accept no responsibility should difficulties arise in such circumstances 5 6 1 General requirements automatic dialling devices 3 This equipment shall not be set up to make automatic calls to the Telecom 111 Emergency Service 5 5 4 Manual insertion of additional digits 2 This unit will only work in conjunction with a tone signalling DTMF telephone but some telephones may not be compatible Since noise or speech from the telephone can upset dialling from this unit errors may result if the devices are used together in other than quiet conditions Where it is necessary to dial prefix digits such as a Caller Display override code 0196 or 0197 this unit will have to be used in conjunction with an associated tone signalling DTMF telephone Note that some telephones are NOT compatible with this unit and dialling
75. art of the Test Report or b Supplied by the Applicant in which case they must be verified by the Testing Authority as authentic photographs of the product concerned e Relevant details would include circuit boards containing telecommunications functions power supplies and any modifications which could affect compliance with PTC Specifications Photographs are required only of assemblies which contain components likely to affect compliance with any PTC Specification 100 PTC 200 May 2006 13 EQUIPMENT DOCUMENTATION 13 1 General All CPE designed for connection to the Telecom Network shall be supplied with appropriate documentation The requirements for documentation will vary according to the intended function and complexity of the CPE in question 13 2 Documentation requirement Documentation should cover the following topics 1 Installation Instructions This would normally include a Unpacking instructions b Assembly instructions c Instructions for connection to Power Supply Telecom Network and other equipment d Set up instructions 2 Operating Instructions 3 Special Conditions a The Special Conditions will usually be set as a result of the equipment complying with either a requirement less stringent than Telecom s objective requirement or a limitation in the equipment capability which may prevent access to a particular network function b These conditions shall be documented as warning
76. ask 3 At 8 kHz the receive sensitivity should be not greater than 15 dBPa V when measured on a zero length line e This is a preferred requirement for any telephony device which is likely to be connected to a PABX or other digitally encoded customer premises equipment using 8 kHz sampling 4 The receive frequency response and 8 kHz sensitivity shall be measured Up per limit wo 2 ZG S 7 om 4000 SS a S 500 4 2000 4 5000 2 5 Z F 10 Weg 10 000 12 A oi ap 300 20 D TO 25 8 100 200 300 d00 500 1000 2000 2000 5000 Frequency Hz FIG 4 8 RECEIVE FREQUENCY RESPONSE OF TELEPHONY DEVICES 4 9 3 Non voice equipment 1 The frequency range normally available over the Telecom PSTN for the transmission of data is 300 3400 Hz ref Document TNA 102 clause 8 1 2 Subject to the power limits stated in clause 4 2 any equipment may transmit frequencies in the range 0 4000 Hz but there is little likelihood that the network will pass signals over the whole of that frequency range e Signal frequencies above 4 kHz are treated as noise and shall satisfy the requirements detailed in clause 4 3 2 3 Any non voice device which transmits operational signals outside the basic 300 3400 Hz band shall have the capability of automatically reducing the transmitted signal bandwidth until it operates successfully A suitable warning notice shall be inserted in the User Instructions for such devices see also
77. at such features are permanently disabled Depending on the type of product and feature concerned Telecom reserves the right to insist on such disabling as a condition of a Telepermit grant Disabling may be carried out in one or more of the following ways a An internal hardware modification b Internal switching or strapping inaccessible to the normal user c Ensuring that the prohibited features can only be enabled by external programming the information for which is not available to the user 18 PTC 200 May 2006 4 In all cases where the disabling of a function is mandatory for the grant of a Telepermit the following conditions shall apply a No software based disabling arrangements which are lost when the device is unplugged from the line disconnected from a c mains or during replacement of an internal battery shall be used b No prohibited feature shall be automatically enabled after any disruptions of the type described in a above 5 Some parameters are configurable by either the user or service personnel and can affect compliance with PTC Specifications The correct settings for such equipment shall be noted as part of the test results for the parameter s concerned and shall be included in the User Instructions e Parameters which are set up by DIP switches strapping fields or non volatile memory are applicable Typical parameters are transmitted levels signalling options etc 2 7 Naive users
78. ation generally follows that used in the 1997 edition some changes have been made where it is desirable to associate related requirements in one area 2 2 Related Specifications 1 For any Telepermit application to be successful the equipment concerned shall comply with the requirements of the following specifications AS NZS 60950 Electrical Safety Requirements see also clause 2 8 TNA 102 Analogue PSTN Line Interface Conditions 2 All Telepermit applications and ongoing product marketing shall comply with the requirements of Specification PTC 100 3 As outlined in Specification PTC 100 where any conflict arises between its requirements and those of this Specification the requirements of this Specification shall take precedence 2 3 Marketing features Some equipment features or characteristics are regarded as purely marketing issues and their requirements are therefore not necessarily dealt with in this Specification However in cases where clarification is considered desirable explanatory notes are provided e Although regarded as marketing features it is a requirement that they be included in the features list referred to in clause 2 4 5 below 2 4 Specialised services amp features 1 Some products incorporate one or more special features which interact with the Telecom network and which may affect the mandatory requirements of this Specification 2 In addition some products using specialised services have
79. between the limits of 6 VU and 16 VU when measured using the test arrangement shown in Fig 4 1 a on a 0 km line The preferred range is 6 VU to 12 VU 4 For any device capable of transmitting pre recorded music synthesised music or composite speech and music signals the level of music or composite signals shall be between the limits of 12 VU and 25 VU when measured using the test arrangement shown in Fig 4 1 a on a 0 km line e See Appendix 2 for further information on VU volume unit measurements 4 3 Noise and Crosstalk 4 3 1 Equipment on hook 1 The idle state or on hook psophometric noise power level measured against 600 Ohms of any device connected to a Telecom line shall be no greater than 65 dBmp e Mean psophometric noise power should be measured in accordance with ITU T Rec O 41 1994 e On hook noise may affect the perceived performance of other telephones used on the same line Also excessive noise levels on one line may induce unwanted noise on adjacent lines 2 a The power level of individual spectral components above 4 kHz should not exceed the limits formed by straight lines joining the following coordinates see Fig 4 2 Frequency Power Spectral Density kHz dBm 4 0 40 10 0 40 20 0 50 50 0 70 gt 50 0 amp lt 100 0 70 gt 100 0 amp lt 10 MHz 50 b The one minute mean power level in any 3 KHz bandwidth contained wholly above 4 kHz shall be no greater than the limits
80. ble of direct plug connection to the network e The BT jackpoint is not suitable for external use due to its lack of corrosion protection 2 Telecom s standard installation practice is for fixed wiring from the device to be BT plug connected within the building 3 The cable used to connect any exterior mounted device to the internal building cabling shall be of a suitable type for the environmental conditions This implies the need for relatively thick insulation and sheathing For this reason all such devices shall have terminals suitable for connection of heavier weather resistant cable 90 PTC 200 May 2006 e The most suitable means of connection is to terminate the external cable from the device on a terminal block mounted adjacent to or within the mounting box of a standard jackpoint which is part of the internal premises cabling within the building A flying lead with one end connected to this terminal block can have a BT plug on the other end which inserts into the standard jackpoint 10 5 Other jackpoint connections 1 For connection to analogue leased lines the modular connection arrangement shown in Technical Document TNA 102 clause 9 3 3 is recommended e This is the standard 8 way plug and socket commonly known as RJ45 Commercial building cabling compliant with AS NZS 3080 uses this type of socket 2 For connection of proprietary interfaces such as the extension phones on some key systems and PABXs the 4
81. by flashing the switch hook or repeat use of the recall button RECALL PROBLEMS WITH THIS PRODUCT ARE NOT TO BE REPORTED TO THE TELECOM FAULTS SERVICE 6 9 Series connected equipment 6 9 1 D C line characteristics 1 Some series connected devices provide a continuous d c path between ports at some stage of operation On such devices the sum of the total voltage drops between ports via each leg shall for the off hook condition not exceed the limit curve shown in Fig 6 2 which is formed by straight lines joining the following coordinates LINE CURRENT MAX VOLTAGE DROP 0 30mA 3V 100 mA 6V ed d kend Hanes 100 6 By P 30 3 10 20 30 40 50 DI HU DU 30 100 Current Tom A FIG 6 2 VOLTAGE DROP THROUGH SERIES CONNECTED DEVICES 2 Some series connected devices perform a switching function during ringing and it is necessary to restrict any in rush current that may occur In such cases the current drawn at the line port shall fall to a level not exceeding 5 mA within a period of 10 ms 65 PTC 200 May 2006 following the connection of a call to a terminal equipment port The following test set up shall be used see Fig 6 3 a With a 50 V dc source in series with a 400 Ohms resistor connected directly to the line port and b a series network consisting of a 5 uF capacitor and an 1800 Ohms resistor connected to the terminal equipment port Ofthook Sensing Co Esp R naionv on
82. ce point in Pa Pen is the sound pressure generated in the artificial ear in Pa b The masked sidetone loudness rating STMR in dB is calculated from the 116 PTC 200 May 2006 formula 10 14 STMR 0 225 logig 10 0 0225 LMestn Lee Win n 1 where Wun is the sidetone weighting factor given in Table 1 LmesTn is the sidetone loss in dB Len is the real ear loss given in Table 1 in dB 4 12 Instability test 1 Check stability of normal operations of all devices other than telephony devices when connected as in Fig A1 with a 0 km artificial line and a BT3 network connected in place of RL This check shall be carried out with line currents of 20 mA and full current or 80 mA 2 amp 3 For telephony devices the test set up is as shown in Fig A1 with 0 km artificial line The handset is placed off hook face down on a hard flat surface for the duration of the test With the line current set at 20 mA checks are to be made for any sustained audible oscillation emitted by the device when each of the following alternative terminations are used in place of R a A270 Q resistor and b a1600 Q resistor in series with a 510 nF capacitor This test is to be repeated at full current or 80 mA Also for devices fitted with a user controlled receive volume control the checks are to be made with the volume control set at both maximum and minimum positions 4 13 Acoustic shock tests of telephony devic
83. ch is capable of either automatically initiating and or answering calls shall release such calls ref clause 6 4 3 as follows a Within 60 seconds in the event of carrier failure or lack of activity e Failed call attempts by automatic calling equipment are covered separately in clause 8 1 5 e Voice equipment such as answer phones must be careful to differentiate between disconnect tone and voice activity when determining the beginning of the timeout process e If one party releases the other party may receive disconnect tone or one of the other supervisory tones from the exchange In some circumstances this may be mistaken for interrupted carrier e g the frequencies used by the backward channel of a V 23 modem are very close to the disconnect tone frequency e ITU T fsk modems Recommendations V 21 and V 23 specify a maximum carrier on to carrier off detection delay of 80 ms 83 PTC 200 May 2006 b Within 15 seconds of completion of its intended function e For example a modem should release within 15 seconds of the DTE negating circuit 108 2 and a fax machine should release within 15 seconds of the sending reception of the end of procedure EOP message ref ITU T Rec T 30 c Within 5 seconds in the event of a failure in the power supply to the equipment 2 For answering devices which cannot detect the difference between legitimate carriers and disconnect tone the call release mechanism
84. ct Explanatory only Terminal equipment port 1800 5 uF 400 z 50 V To other Terminal Equipment Terminal Ports equipment port Terminal device Series Connected device with Other multiple ports terminal equipment ports FIG A4 TEST SET UP FOR SERIES CONNECTED DEVICE 6 9 4 Line grabbing equipment 1 A suitable test set up using a reference telephone connected to the terminal equipment port shall be used to enable the timing requirements to be checked 6 10 D C line feed to other devices 4 5 amp 6 Test measurements to be carried out using a reference telephone connected to the port under test 6 11 Fail safe requirements Functional checks only required To simulate a power failure the supply voltage should be gradually be reduced until the equipment fails to operate 7 1 General 7 The test method see 7 5 amp 7 6 below for Ringing Number quantifies both sensitivity and loading on a scale of 0 5 5 The test set up is shown in Figure A5 Because of the adoption of 2 wiring 3 wire CPE will be rated connected via a 2 wire socket The sensitivity test also covers sensitivity to cadence timing The RN shall be measured and recorded for each of the Distinctive Alert ringing cadences and also separately for the on and off states of equipment with a ringer on off option 120 PTC 200 May 2006 7 4 Audible characteristics of ringer Minimum ringing acou
85. ded that a ringer be capable of producing a minimum acoustic level of 75 dBA However this is not mandatory 2 There are no further requirements e g frequency specified for the audible characteristics e The nature of the sound output signal and the frequency or frequencies used are regarded as marketing features 7 5 Ringer sensitivity and loading 7 5 1 General operation 1 During assessment of ringer sensitivity and ringer loading ringing detectors shall operate reliably and any audible ringer shall be deemed to operate when it emits an audible signal compliant with clause 7 4 e An audible ringing detector is regarded as operating reliably when it rings audibly and cleanly with no hesitation stuttering or shortening of the on period e Note that operation of a ringing detector does not mean answering a call It simply means the reliable indication of the presence of ringing on the line 2 The sensitivity and loading requirements shall be tested for each of the four Distinctive Alert cadences DA1 DA4 unless the device is set to differentiate between DA s and operate to only one of them Where a device does not respond to all DA s an indication of the DA s which the device does not respond to shall be included on the Telepermit label along with the RN allocated ref clause 7 6 Also the following warning notice shall be included in the user instructions This
86. device only responds to Distinctive Alert cadence s DA x 3 Where Distinctive Alert decoding is built in on equipment other than automatic answering devices the ringing detector shall provide an alerting signal as soon as possible after completion of the decoding process and not more than 3 seconds after ringing is applied e The minimum time in which the decoding process can be completed is 1600 ms Therefore a distinctive alert decoder is required to extend ringing between 1600 ms and 3000 ms of ringing being 72 PTC 200 May 2006 applied 4 For a product to be claimed as compatible with a given Distinctive Alert cadence the ringing detector shall respond reliably to cadence on periods within the range of 360 ms to 440 ms Also although the following specified ringing cadence ranges for on periods are not mandatory requirements performance shall be tested against them to provide an indication of their capabilities I Capability A 320 ms to 480 ms ii Capability B 280 ms to 520 ms 7 5 2 Ringer sensitivity 1 Where ringing detectors are provided the ringer sensitivity RS on a scale of 0 5 shall be determined using the test set up shown in Fig 7 1 The method used for determining RS is described in detail in Appendix 2 This applies to both 2 wire and 3 wire devices 2 Ringing detectors shall not operate to ringing voltages of 30 Vp p or less For wire devices ory SW T
87. dge of the artificial ear 4 9 1 Send frequency response of telephony devices The telephony device is connected to the test equipment as shown in Fig A1 with RL set at a value of 600 O resistive a line length of 0 km and current set at 20 mA Measurements shall be made a using the 14 test frequencies specified in Table 1 or b making a continuous sweep across full frequency band specified The send sensitivity Smjn is determined by the procedure described in ITU T Recommendation P 64 1993 The output voltage is measured at the fundamental frequency of the stimulus The results are expressed in IBV pa 4 9 2 Receive frequency response of telephony devices The test set up is the same as for send frequency response ref clause 4 9 1 above with the generator set to deliver an e m f of 10 dBV The receive sensitivity Sjen is measured as a function of frequency as described in ITU T Recommendation P 64 1993 The sound pressure is measured at the fundamental frequency of the stimulus The results are expressed in dBPa 4 9 3 Frequency response of non voice equipment 3 On devices that transmit frequencies above 3400 Hz check that operation between units continues when the frequency range is restricted to 300 3400 Hz For this test a suitable low pass filter with a cut off frequency between 3400 Hz and 3500 Hz shall be inserted in the connection between units 114 PTC 200 May 2006 4 9 4 Frequency response
88. during all four DA codes a warning notice shall be included clearly stating which DA codes device is compatible with Yes No Complies Yes No Receivers shall perform satisfactorily over zero 3 km and 6 km artificial lines In each case test shall be carried out with and without a ringer built out to RN of 5 and ringer shall remain operational for all tests Yes No Complies Yes No Receivers shall perform satisfactorily on a 6km line in parallel with an RN of 5 with time between ringing and CSS 60ms Complies Yes No Yes No All on hook data messages containing corrupted data shall be discarded Yes No Complies Yes No Data Display Where the display does not correspond exactly with the number to be called back the need to insert prefix es for manual dialling shall be explained in the User Instructions ref 5 6 5 Yes No Complies Yes No PTC 200 May 2006 11 1 7 12 0 12 2 12 3 12 4 148 Data Storage If data storage is incorporated the CLI device shall discard any corrupted data Yes No Complies Yes No Dial Back Considerations Display units with no dial back facility shall be provided with clear instructions to users such that wrong numbers are minimised This particularly applies to units which do not display precisely the digits to be dialled Yes No Complies Yes No PHYSICAL CONSTRUCTION amp MODIFICATIONS Switches amp Connectors All connectors switches ke
89. e of an associated telephone during dialling ref clause 5 2 5 Use in high ambient noise areas or during loud conversation could lead to digits being ignored by the local exchange and calls timing out e Note that this affects ONLY the calling party as missed digits usually do not result in a wrong number 2 Where it is necessary to use an associated telephone with an adjunct dialling unit for dialling prefix es suppliers shall include the following warning notices in sales brochures and user instructions This unit will only work in conjunction with a tone signalling DTMF telephone but some telephones may not be compatible Since noise or speech from the telephone can upset dialling from this unit errors may result if the devices are used together in other than quiet conditions Where it is necessary to dial prefix digits such as a Caller Display override code 0196 or 0197 this unit will have to be used in conjunction with an associated tone signalling DTMF telephone Note that some telephones are NOT compatible with this unit and dialling errors may result if the two devices are used together in other than quiet conditions The Telecom Faults Service is NOT to be called should such problems arise In such cases it is recommended that the prefix and wanted number are dialled manually 5 5 5 User instructions 1 In view of the above complications resulting from use of automatic dialling devices
90. e cordage and plug attached and with the device connected to the relevant test circuit via the new Telecom standard 2 wire line termination and jackpoint combination see Technical Document TNA 102 Fig 6 c for component and wiring details The 2 wire jackpoint shall satisfy the requirements of Specification PTC 223 8 For apparatus which must be used with protection barriers or line isolating units the specified type is connected in its normal position for the tests 9 Where the device is reliant on more complex equipment for its operation arrangements may be made for assistance to be given by the Applicant to the Testing Authority for the test set up Such arrangements will be at the discretion of the Testing Authority 10 Where called for performance shall be assessed against an artificial line made up of sections of maximum length 0 5 km ref Fig A1 b providing an adjustable line length of from 0 to 6 km For preference line lengths of 0 1 km should be used each consisting of two series resistors of 8 4 Q and two parallel capacitors of 2 5 nF as shown in Fig 4 1 b 107 PTC 200 May 2006 11 Test procedures for several parameters are specified for different values of line current The source resistance Rs is adjusted to obtain the current required for each test see Fig A1 Alternatively these tests may be performed by switching discrete values of Rs as follows APPROX EQUIVALENT LENGTH APPROXIMATE LINE C
91. e not logged or b the user is fully aware that unsuccessful calls and wrong numbers will not necessarily show up on the machine record 8 1 9 Recording Billing Information after Called Number Answer 1 Systems that collect dialled numbers for call billing purposes shall not record any end to end DTMF signalling that takes place after an answer signal has been received e Digits signalled after an answer signal do not relate to call charging but they may contain information that is confidential to the customer 81 PTC 200 May 2006 8 2 Automatic answering equipment 8 2 1 Call answering 1 The requirements for equipment which has an automatic answering function are as follows a It is strongly recommended that all incoming calls are answered in not less than 5 seconds and not more than 15 seconds b All incoming calls shall be answered in not less than 3 seconds and not more than 30 seconds of receipt of the ringing signal This shall apply independently of which of the four Distinctive Alert ringing cadences is used The only exceptions are those given in sub clause 4 below c In all cases where the mandatory requirements of b above are not met detailed reasons shall be given Telecom reserves the right to decline any product if the reasons given are considered less than satisfactory e This ensures that the caller does hear at least a short burst of ringing tone This helps in locating faults or operating problems
92. e subject to drift If this proves to be inconvenient and your calls are interrupted then the problem of timing should be discussed with the equipment installer The matter should NOT be reported as a fault to Telecom Faults Service 6 11 1 All customer equipment fail safe requirements 3 IMPORTANT NOTICE Under power failure conditions this telephone may not operate Please ensure that a separate telephone not dependent on local power is available for emergency use 7 5 1 General operation ringer sensitivity and loading This device only responds to Distinctive Alert cadence s DA x 7 5 2 Ringer sensitivity 3 This device may be subject to ringing or bell tinkle when certain other devices are connected to the same line If this occurs the problem should not be referred to the Telecom Faults Service 4 This device may be subject to ringing or bell tinkle when calls are made from another device on the same line If this occurs the problem should not be referred to the Telecom Faults Service 103 PTC 200 May 2006 7 7 5 Locally generated ringing f Difficulties may be experienced with this device ringing some types of telephone connected to it If this problem occurs it should be referred to the equipment installer The matter should NOT be referred to Telecom Faults Service U Devices designed to respond to particular ringing cadences may not respond when used with th
93. ecommendations P 64 1993 and P 65 1993 Simple telephone is an apparatus for voice communication over the PSTN for which both initiation and termination of the call is under manual control and involves the mechanical lifting of a part or the whole of the apparatus and incorporating a key pad or rotary dial to provide signalling e The term simple telephone relates to its basic operation not to its facilities or features Thus a multi button telephone with repertory dialling clock calculator etc may be included within this definition e A simple telephone may be directly powered from a line powered by internal batteries or via power units connected to the public supply e For the purposes of this Specification a simple telephone does not include any instrument capable of directly accessing two or more telephone lines Supervisory equipment is any equipment intended to monitor and or detect some parameter and which is capable of initiating or terminating a call in order to pass the information over the Telecom line to some remote point Supervisory system is the combination of some central control equipment the Telecom network and one or more items of supervisory equipment which together form a complete telemetry system e Such equipment has generally been regarded as professional equipment in the past but the growth of security burglar and fire alarm systems for normal residential applications has led to such equipment
94. eference also Specification TNA 151 Issue 2 4 a The send and receive loudness ratings at all line currents with the telephone connected directly to the feed bridge shall be within the following limits SLR dB RLR dB Minimum Loudest 2 9 5 Objective Margin POS 6 5 3 Maximum Quietest 8 3 5 b There should be no more than 3 dB difference between the maximum and minimum send loudness rating results measured at line currents of 20 mA 45 mA and 80 mA e The 3 dB recommended maximum difference reflects the preference for non regulated telephones to be used 48 PTC 200 May 2006 5 To assist suppliers to optimise performance the following is the ideal design target area for SLR and RLR with the telephone connected directly to the feed bridge SLR dB RLR dB 0 km Line 5 0 1 6 5 1 e It should be noted that these design target area limits are not test limits for production samples They are given here for guidance only 4 11 Sidetone for telephony devices 4 11 1 Significance of sidetone 1 Sidetone is an important factor in telephony and can have as much effect on the perceived quality of a telephone conversation as the actual loudness and clarity of the speech signals 2 Sidetone performance results from human head characteristics in combination with the mechanical and electro acoustical properties of the telephone Some sidetone is important to avoid deadness on a telephone but excessive levels of side
95. ement as most ringers only conduct over part of the waveform b Sensitivity test procedure Connect the device and close all switches The ringing source is switched on and off in accordance with the cadence DA1 DA4 under test If the ringer does not operate reliably see 2 below the switches are opened one by one until the ringer does operate reliably The Ringer Sensitivity number RS is derived as follows RS 10 minus the number of loads switched in 2 121 PTC 200 May 2006 For 3 wire devices only SWT Sw2 Cadence Switch 80Vrms 25 Hz Sinusoidal 50 V All component tolerances to be 1 FIG A6 RINGING TEST SET UP The above shall be repeated for each of the four Distinctive Alert cadences DA1 DA4 and the following recorded a Determine the codes to which the equipment does or can be programmed to respond to b Confirm that when programmed for a specific code the device does not respond to any other c Determine which codes the equipment responds to when i it is not programmable or ii is progammable but not programmed for any specific code d Determine the functions which each code invokes 2 The ringer is tested for operation when the voltage across the ringer is reduced to 30 Vp p The test set up is as per Fig A6 with all 10 loads switched in and the variable resistor adjusted accordingly 3 To test response of the ringer to short ringing bursts the test arra
96. epend on the functions offered by the product under test A2 2 2 Clause by clause procedures The following Clause numbering corresponds with that used in the body of this Specification and the Test Schedule in Appendix 3 4 1 General also ref clause 4 14 1 c Where adjustable volume controls are fitted on telephony devices two sets of tests will be required for the parameters affected The tests are necessary to determine the effects of the volume control and ensure that there is at least one setting at which the transmission performance requirements are fully complied with The tests affected are to clauses 4 2 to 4 13 of this Specification and each should be carried out with the volume control set in turn to both minimum and maximum 2 In most cases where a proprietary interface is involved it will only be necessary to test the combination of non terminating series connected device and terminal device However if the interface can function as proprietary or standard depending on the number of individual connections used then the series connected device should also be tested as such on its own e Typical examples are some small PABX KTS s with extension interfaces which are basically designed for proprietary telephones and consist of typically separate data or signalling and voice connections In some such cases standard 2 wire telephones can be connected using the voice connections only 4 2
97. erminating equipment port of the series connected device Lpy as derived in 7 7 2 1 b b RN for the series connected device as derived in 7 7 2 2 7 7 3 Devices with terminating facility For series connected devices with a terminating facility test as in 7 5 and 7 6 7 7 4 Terminal equipment or extension ports The requirements of this clause by observation and timing 7 7 5 Locally generated ringing a amp DI Ringing supplies to be tested against AS NZS 3260 c amp d Ringing connection and cadence reproduction to be checked by observation and timing e amp f Ringing waveform crest factor to be checked by examination using an oscilloscope g amp h Use Test Set up shown in Fig A8 Open all switches Connect ringing source under test in place of the variable resistor the cadance switch the 80 V ringing source and the 50 V battery Close switches SW1 to SW10 one at a time until the volatge falls below 107 Vpp The number of switches closed is N The RN that the ringing source can support is N 1 2 8 AUTOMATIC CALL SET UP ANSWERING amp RECORDING FUNCTIONS The methods of testing for this Section will vary from product to product and can best be determined by the Testing Authority in each case Mandatory requirements specified can be checked by observation and manual timing of events 9 1 Cordless devices security 2 Establish number of security codes available and methods of allocation and
98. errors may result if the two devices are used together in other than quiet conditions The Telecom Faults Service is NOT to be called should such problems arise In such cases it is recommended that the prefix and wanted number are dialled manually 5 5 5 User instructions 4 If a charge for local calls is unacceptable the Dial button should NOT be used for local calls Only the 7 digits of the local number should be dialled from your telephone DO NOT dial the area code digit or the 0 prefix 102 PTC 200 May 2006 6 3 Off hook d c line characteristics 3 This equipment may not provide for the effective hand over of a call to another device connected to the same line 6 8 Recall and call waiting 5 The recall facility of this product may not always operate correctly on some parts of the Telecom network or on some PABXs available on the market If this is the case then recall can be activated by flashing the switch hook or repeat use of the recall button RECALL PROBLEMS WITH THIS PRODUCT ARE NOT TO BE REPORTED TO THE TELECOM FAULTS SERVICE 6 9 4 Line grabbing equipment 3 This equipment is set up to carry out test calls at pre determined times Such test calls will interrupt any other calls that may be set up on the line at the same time The timing set for such test calls should be discussed with the installer The timing set for test calls from this equipment may b
99. es The telephony device is connected to the test equipment as shown in Fig A1 with RL set at a value of 600 O resistive a line length of 0 km and full current or 80 mA The generator is set to deliver sinusoidal signals at an e m f of 24 dBV r m s ata frequency of 1kHz 4 14 Adjustable volume control See clause 4 1 4 15 Telephony security in on hook condition The telephony device is connected to a line in parallel with another telephony device With the first device on hook a call is established from the second device and conversation should proceed The first device while still on hook should then be monitored subjectively to ensure that no evidence of speech can be detected within 300 mm of the device 117 PTC 200 May 2006 4 16 Recorded speech quality The speech recorded for test purposes should be from a standard source established by the Testing Authority for this purpose The recording shall be the same as that used for testing power levels ref clause 4 2 A subjective assessment of speech quality shall be made 5 1 Signalling types 4 While testing transmission security ref clause 4 15 above a check shall be made to ensure DTMF signals cannot be transmitted while the device is on hook 5 2 Transmission of DTMF signalling DTMF signalling shall be tested using the set up shown in Fig A1 with set ata value of 600 Q resistive and full current or 80 mA For line powered devices additional tests sha
100. ests confirm correct operation of the device under worst limit conditions when connected to a nominal 24 V 400 Q source i e 24 3 V and 400440 Q 3 amp 5 The test set up in Fig A3 shall be suitably modified for these tests and the timing requirements checked 6 7 On hook line current With the device connected to the 50 V battery via a 1500 Q resistor the current drawn shall be checked under both normal and reversed line conditions The value to be recorded shall be the higher of the two measurements taken 6 8 Recall and call waiting For equipment with TBR recall and or call waiting key function the device should be connected as shown in Fig A3 in the off hook state with Rx set at 1750 Q or current set at 20 mA The duration of the timed break shall then be checked when the recall key is operated 6 9 1 D C line characteristics series connected equipment 1 The test set up is as shown in Fig A4 but with a reference telephone connected to the terminal equipment port With the telephone off hook the volt drop is measured between ports with feed currents of 20 mA 30 mA 40 mA and full current or 80 mA 2 On devices which perform a switching function during ringing the in rush current is checked as the switching takes place 4 Clauses 6 3 to 6 8 shall be checked using the test set up with reference telephone used in 1 above 119 PTC 200 May 2006 Off hook Sensing C
101. ethod e The reference to A amp B wires is used for convenience They do not necessarily relate to any particular polarity since there is a high risk of line reversals occurring see also clause 6 2 3 3 An acceptable alternative plug and socket arrangement for 2 wire connection in a business premise is the 8 way modular connector specified in IEC 603 7 and also in EIA TIA 568 and EIA TIA 570 The preferred pin out designation is T568A using pins 4 amp 5 as shown in Technical Document TNA 102 Fig 7 e This modular connector is also specified in AS NZS 3080 1996 and ISO IEC 11801 1995 e This 8 way plug and socket is commonly known as RJ45 in New Zealand However this is not strictly the correct designation 4 Either BT plugs or 8 way modular plugs may be fitted on 2 wire connected CPE without the need for separate Telepermits However where the 8 way plug is fitted this should be clearly shown on product packaging 88 PTC 200 May 2006 5 Devices fitted with plugs of types other than those described above will be considered for the grant of a Telepermit in the following circumstances a If a device is offered for sale complete with an adapter unit which provides a means of compliance with this Section b If a device is regarded as an integral part of another item of equipment In this case the device may be connected to its parent equipment by means of a non standard plug and socket e An example
102. following the application of high voltages to a Telecom line or to changes in local earth potential The only requirements are those of AS NZS 3260 1993 e Any such additional protection is regarded as a marketing feature 2 10 Temperature All products should be compliant with this Specification at all temperatures in the range 10 C to 40 C 2 11 Compliance testing 2 11 1 Test procedures 1 The sampling evaluation and test procedures required for granting a Telepermit for any product covered by this Specification are detailed in Appendices 1 and 2 2 The selection of tests applicable to the stated features of the product is the responsibility of the Testing Authority For this reason it is important that details of all available features be supplied by the applicant If the Testing Authority is not advised of all features and additional ones are discovered after a Telepermit has been granted then it may be necessary for the product to be retested Where there is any doubt the matter should be discussed with Access Standards preferably prior to commencement of testing e A subsequent retest is likely to involve the applicant in greater cost than if all features were declared originally 3 For some complex devices the Testing Authority may have difficulties performing the necessary tests In such cases the Applicant shall provide the necessary liaison to ensure that the Testing Authority has sufficient information to readily
103. for the centre frequency of the band as determined in a above 39 PTC 200 May 2006 4 40 Ke 40 2 10 A0 m 5i 20 50 is CH DL En Le K T n 10 20 30 40 50 Frequerey KHz FIG 4 2 NOISE POWER SPECTRAL DENSITY LIMITS 3 For telephony devices any coupling between the microphone and or receiver and the line shall be such that the requirement of sub clause 1 above is not exceeded when the room noise or conversation adjacent to the device is at a level of 65 dB SPL e This requirement relates to potential bugging whereby the telephone in its on hook state could provide a source of signals to an unlawful listener e dB SPL is the sound pressure level in dB referenced to 20 uPa 4 3 2 Equipment off hook 1 Non signalling call established state a The off hook psophometric noise power level generated by locally powered telephony devices when in the non signalling state shall not exceed 60 dBmp with the microphone rendered inoperative e Mean psophometric noise power should be measured in accordance with ITU T Rec O 41 1994 e A wide variation in ambient noise conditions may exist in any customer s premises and such noise is often at far higher levels than the electrical noise generated within modern terminal equipment b For devices transmitting recorded speech or music the combined recording and playback facility shall have a signal to noise ratio of at least 20 dB over the freq
104. g facility shall comply with the requirements of clauses 5 2 1 to 5 2 3 5 2 5 Speech circuit suppression 1 For all devices capable of sending DTMF signals the normal transmission path from any voice or similar source shall be attenuated in both directions of transmission by at least 30 dB during DTMF sending This applies to terminating devices and also to other series connected devices capable of being used on the same line as a terminating device 54 PTC 200 May 2006 2 On telephony devices a confidence tone may be applied to the receiver so that the user is aware that signals are being sent to line e The application of confidence tone and the level selected are regarded as marketing features Only used for Zare devices gt 400 pF DEVICE 2 WIRE D UND ER gl a TEST P as specified for pariicwar test 10 H 10 H H 400 Y O wee x valle necessary to d achieve specii ed line currert Mote The 400 O includes total resistance of inductors FIG 5 1 TEST SET UP FOR SIGNALLING TESTS 5 3 DTMF receivers 1 Any device incorporating a DTMF receiver as one of its main functions shall be capable of responding to DTMF signals in the following ranges a Any receive level between 5 dBm and 30 dBm b DTMF frequencies within 1 5 2 Hz of the nominal values ref clause 5 2 1 1 e It is strongly recommended that devices respond down to 40 dBm ref Document TNA 102 clause 5 2 2 2 The rece
105. g notice required in User Manual Complies Yes No NA Automatic Calls to Different Numbers Equipment programmed to call different numbers shall go on hook for minimum of 2 secs between calls Complies Yes No NA If requirements of 1 above are determined by other device e g PC warning notice required in User Manual Complies Yes No NA PTC 200 May 2006 Yes No Yes No NA Yes No Yes No Yes No NA Yes No Yes No Yes No Yes No NA Yes No NA Yes No NA 8 2 8 2 1 1 b 144 Termination of Failed Call Attempts If not answered in 90 secs equipment shall terminate call Complies Yes No Call Identification Phase Recorded message shall identify caller and be repeated at least once Complies Yes No Audio monitor provided If fax machine provision of CNG tone is mandatory User Instructions Warning notice s required to indicate that device shall not be set up to become a nuisance to other customers and or automatically call 111 Emergency Service Complies Yes No Call Logging Devices with logging facilities shall either log all calls initiated or include warning notice that log may not agree with Telecom account Complies Yes No NA Automatic Answering Equipment Call Answering Incoming calls shall be answered within 3 30 secs for all DA s 3sec lt Limits 30 secs In all cases where requirements of b are not met detailed reasons shall be supplied
106. gle data message format SDMF and multiple data message format MDMF shall be supported 2 Receivers should be capable of receiving data during any of the four ringing cadences used see clause 11 1 3 a above If not a suitable warning shall be included which clearly explains to the customer which DA codes the device is compatible with Fig 11 3 illustrates the timing requirements for analogue CLI devices with respect to the different DA codes e It should be noted that the data is limited to Time Date and Directory Number when sent with DA3 and DA4 cadences 3 Receivers shall perform satisfactorily when connected via a zero 3 km and 6 km artificial line see Fig 4 1 b in Section 4 In each case the test shall be carried out with and without a ringer built out to a RN of 5 ref Section 7 connected in parallel The ringer shall remain operational for all the tests in which it is connected 4 Response shall be checked at 6km in parallel with ringing detector RN 5 with CSS preamble beginning 60 ms after the end of the first ringing cadence 5 All messages that contain corrupted data as indicated by an incorrect checksum shall be discarded 94 PTC 200 May 2006 6 It is recommended that the receiver functions should be independent of the exact length of the CSS and pre message mark signal e These are not included in the checksum and do not carry any information except to function as a wake
107. h devices e See also clause 5 6 4 and the associated mandatory warning notices 6 9 2 Call pick up Where appropriate provision may be included on series connected devices for DD PTC 200 May 2006 incoming calls to be picked up by terminal CPE other than that receiving an incoming ring This can be achieved by going off hook and sending a suitable signal back to the series connected device to divert the incoming call e This is a common feature on PABXs and may soon be regarded as normal for multiple port Distinctive Alert decoders 6 9 3 Call collision 1 Acommon problem for series connected switching devices is for an outgoing call attempt to occur while an incoming call is being processed i e call collision To avoid this possibility it is recommended that the switching device returns busy tone to all ports during the processing period 2 The normal network busy tone is defined in Document TNA 102 clause 7 1 It may however be desirable to consider use of a more urgent busy for this application e This recommendation applies particularly to multiple port Distinctive Alert decoders e Care must be taken to make sure no lockup situations arise from solutions to call pickup clause 6 9 2 and call collision 6 9 4 Line grabbing equipment 1 Some series connected devices incorporate a line grabbing function whereby all other equipment normally connected is isolated from the line see clause 10 7 1 The following co
108. h this Specification shall be tested 3 Not all requirements of this Specification are included in the Test Schedule in Appendix No 3 The schedule includes only those requirements which are considered consistent with acceptable performance However Access Standards reserves the right to amend the Test Schedule should ongoing experience reveal that this is necessary 4 The primary aim of the test programme is for the independent Testing Authority to be able to satisfy itself that the product under test does in fact comply with Telecom requirements and therefore is not likely to cause trouble to either the user or the Telecom network or to lower customer perception of network performance 5 The performance criteria quoted in this Specification are regarded as true values Testing Authorities will be required to indicate the measurement uncertainty in cases where the test result fails that specified by a small margin The uncertainty may be used to adjust the calculated mean of any marginally failing test result in the Applicant s favour In general component tolerances of test set ups should be 1 6 Tests are made in any order except where otherwise specified Where testing involves taking measurements at different currents or line lengths measurements are made at the lowest current first increasing sequentially to the highest in order to avoid a heating effect on the line test circuit 7 The tests are made with the appropriat
109. he matter with that Testing Authority to establish whether or not to proceed with the Telepermit application and b Where there is apparent justification for an exemption the matter should be addressed to Access Standards for consideration 1 9 Warning to Suppliers 1 Compatibility between the Telecom network and any type of equipment covered by this Specification is necessary for satisfactory operation To ensure that the maximum degree of compatibility is achieved the equipment should fully comply with this Specification 2 It is not possible to guarantee compatibility in every conceivable situation and similarly it is not possible or practicable for Telepermit testing to cover every situation Nevertheless the majority of operating conditions are covered by the testing requirements defined in Appendix 3 3 Suppliers should note that a equipment which is not fully compliant with this Specification may suffer a higher proportion of service problems than that which complies in all respects The cost of dealing with such problems will normally be borne by the customers involved e Suppliers should also note that under the Fair Trading Act 1986 and Consumer Guarantees Act 1993 customers may have the right to pass on this cost to the supplier b Should problems result from use of a product that has granted a Telepermit as the result of limited compliance testing Telecom Access Standards reserves the right to amend the
110. hin 5 seconds details of which shall be given in the User Manual e Techniques such as watch dog timers and relays which connect through in their power off state are typical solutions which would achieve the above requirements s In the event of failure it is normally expected that all telephones are connected but not automatic 69 PTC 200 May 2006 answering devices 3 Single port devices a It is strongly recommended that the failsafe mechanisms necessary for multiple devices be provided on single port devices b User Manuals associated with single port devices shall include details of whether or not there is any failsafe connection provided in the event of any type of failure 6 12 PABX call waiting On some PABXs the call message waiting indicator on extension devices is activated by a 100 V d c signal from the PABX CPE items with this facility shall satisfy all electrical safety requirements of Specification AS NZS 60950 70 PTC 200 May 2006 7 RINGING 7 1 General 1 The provision of any form of ringing detection is not mandatory for devices connected to the Telecom PSTN If however a ringing detection device is connected across a line in the on hook state it shall comply with the requirements of this Section 2 There are four possible ringing cadences used which are known as Distinctive Alerts DA1 DA4 Full details of these are covered in Technical Document TNA 102 The requirements for ident
111. hone System KTS Small Business Exchange SBX and other equipment intended for installation in a customer s premises to switch calls between separate telephone lines e For Telepermit purposes it is necessary to divide PABXs amp KTS s into two defined categories PABX Type 1 is a 4 wire switching device digital or analogue which by its very nature is designed to have an inherent 2 3 dB transmission loss between extension and 2 wire analogue trunk ports e Reference Specifications PTC 107 PTC 108 amp PTC 109 for full details Larger PABXs are normally Type 1 and may also have provision for digital trunks PABX Type 2 is a 2 wire analogue switching device without networking facilities or the capability for such facilities which has a nominal 0 dB 1 dB transmission loss between extension and analogue trunk ports s Kts can normally be categorised as Type 2 e For Telepermit purposes Type 2 can normally be tested against this Specification Professional equipment is equipment of a special nature not generally intended to be offered for sale to the general public e Professional equipment is required to be granted a Telepermit before it is connected to the Telecom network However because of its special nature and the fact that the purchaser will usually have some formal performance agreement with the supplier there may be variations in the conditions which are applied to the grant of a Telepermit Proprietary i
112. ices 4 7 Impedance of bridging equipment The impedance of bridging equipment shall be measured as in clause 4 5 2 above 4 8 Impedance balance ratio to earth Impedance balance ratio to earth shall be measured with the equipment in both on hook and off hook conditions using the test set up shown in Fig A2 The test shall be performed with V4 set at 1 Vims and Rg set at 400 Only used for 3 wire devices C gt 470 UF 2 WIRE DEVICE JACKPOINT UNDER TEST C gt 470 uF 50 V FIG A2 MEASUREMENT OF IMPEDANCE BALANCE RATIO TO EARTH 113 PTC 200 May 2006 4 9 amp 4 10 Frequency response and Loudness Ratings NOTE Some of the following clauses relate to electro acoustic tests of telephony devices The basic requirements for such tests are as follows a All electro acoustic tests are to be carried out in an environment where the ambient noise is insufficient to influence the acoustic measurements being made b The setting up of the mouthpiece and earpiece shall be as follows i Where the mouthpiece of the handset is fixed relative to the earpiece the handset is placed in the loudness rating guard ring position as described in CCITT Blue Book Recommendation P 76 Annex A ii Where the mouthpiece of the device is not fixed relative to the earpiece the front plane of the mouthpiece is mounted 15 mm in front of the lip ring and coaxial with the artifical mouth iii The earpiece is sealed to the knife e
113. ification of these cadences by decoding devices are included in this Section 3 As an operational guide the standard Telecom ringing supply is 25 Hz and the voltage at the customer s premises will generally lie in the range 30 85 V rms Testing to this Specification is based on 38 V rms which is typical for a line with multiple CPE connected e See Technical Document TNA 102 Section 6 for further details on ringing supply 7 2 Stand alone ringers and alerting devices 1 Stand alone ringing devices have long been a common method of providing an auxiliary ringing facility These include bell sets sounders lamp units or other alerting devices which are not an integral part of another item of customer equipment 2 Older designs currently in use are suitable for connection to the previous standard 3 wire wiring arrangement making use of the ringing shunt wire and not having an integral capacitor As stated in clause 7 1 6 above the preference now for all CPE is for 2 wire connection with the capacitor incorporated although this is only mandatory for CPE mounted outdoors see clause 7 3 below 3 Ringers for interior use The requirements for stand alone ringing devices designed for use within buildings on customers premises are as follows a New ringer designs intended for mounting within the customer s premises and not exposed to the weather shall be either 1 Plug connected using the standard BT plug to clau
114. ifications will be carried out by the manufacturer In other cases however the modifications will be carried out after importation and Telecom needs assurance that the quality of the modification work is satisfactory and reliable e The intention is to protect the Telecom Network and personnel suppliers and customers from manufacturers who modify units for compliance testing without later incorporating those modifications into all of their production units Failure to carry out modifications could have implications for importers distributors and retailers under the New Zealand consumer protection legislation 4 Upon application to Telecom for a Telepermit grant Telecom will assess whether further tests will be required on production samples 90 PTC 200 May 2006 e Retesting may be necessary if the production implementation of a modification potentially impacts upon the compliance of some other parameter s For example a modification to the circuitry in the vicinity of the Telecom line interface to comply with network requirements may also alter creepage distances between tracks and or components and thus possibly invalidate some of the test results against Specification AS NZS 60950 for electrical safety 12 4 Photographs All Telepermit applications shall be accompanied by detailed colour photographs showing relevant internal construction details These photographs may be either a Taken by the Testing Authority and included as p
115. igits indicating local calls vary from area to area this arrangement is likely to be practicable only for Computer Telephony Integration CTI systems b Where an exchange line access prefix is necessary the device may be programmed to automatically insert it In such cases the access prefix must only be inserted for local and national calls and not for calls internal to a Centrex group or PABX network e To avoid any customer misunderstanding it is recommended that suppliers clearly state in the product brochures whether or not the product is Centrex compatible 5 5 3 Non code access to other networks 1 Many Telecom customers use another carrier s toll services for their national calls and have their line set up so that their chosen carrier s access code is automatically inserted by the Telecom exchange This service is activated when the caller dials a O or 00 prefix before the wanted number Should such a customer dial the 0 prefix and area code for local calls these calls will also be passed to the other carrier as if they were national calls As a result a toll charge may be incurred 2 Telecom area codes serve more than one local calling area As a result on caller display devices complex user programming would be necessary to automatically separate local calls from national calls as covered in clause 5 5 2 above 5 5 4 Manual insertion of additional digits 1 In some cases it is necessary to di
116. ignal frequency in the range 300 Hz to 3400 Hz used by the device The noise signals both above and below 4 kHz shall be measured as in clause 4 3 1 above 111 PTC 200 May 2006 4 3 3 Multi line devices A 1000 Hz test signal shall be applied to one line at a level of 0 dBm and crosstalk isolation measured on each other line on the device For the off hook condition the microphone of each handset on the device shall be replaced by a resistor of value equivalent to the resistance of the microphone at 1000 Hz 4 4 Distortion 1 b Total send harmonic distortion of devices transmitting recorded speech or music should be measured using a signal frequency of 1000 Hz Where the record level is adjustable the input test signal shall be adjusted so that the associated VU meter indicates 0 dB It is assumed that any equipment having automatically controlled recording levels will be already set to this level c Total send harmonic distortion introduced by non terminating devices should be measured using a signal frequency of 1000 Hz applied at a level of 4 dBm 4 5 1 Off hook impedance 2 amp 3 a The minimum Return Loss and Echo Return Loss of the device against a reference impedance of BT3 shall be measured at the line terminals with the telephone off hook and supplied from a high impedance d c feed see Fig A1 The microphone on each telephony device tested shall be replaced by a resistor of value equivalent to the resis
117. imit lt 3 V at 0 30mA Limit lt 6 V at 100 mA The line current measured at the line port during ringing with 50V 400Q connected to the line port and 5uF 18000 connected to the terminal equipment port Limit lt 5mA Is each terminal port on multi port device compliant with 6 9 1 1 2 Yes No N A In conjunction with any other terminating CPE is the series connected device compliant with 6 3 to 6 8 Yes No N A Is line grabbing function provided If SO How long is clear signal applied before initiating next call Limit 2 2 sec Does equipment comply with 8 1 2 1 Is warning notice in User Instructions D C line feed to other devices All ports of a device for series connected CPE shall provide d c line feed PTC 200 May 2006 Yes No NA Yes No NA Yes No NA Yes No Yes No Yes No Yes No NA Sa Sb 6a 6b 6 11 6 11 1 Gab Gab 2a 2b 139 Any restrictions on the loop resistance for series connected device in order to establish OFF Hook condition Ripple components psophometric limit for series connected port Limit lt 2mV OFF Hook d c feed current for series connected port and load of 10KQ Limit gt 15 mA ON Hook d c feed current for series connected port and load of 10KQ Limit lt 5 mA Is the series connected port capable of supplying continuous ON Hook d c current for CPE with memory functions If Yes is
118. in that test calls can be made manually to confirm whether switching through the network has been successful e Calling line identification information is transmitted during the first cadence of ringing It is important therefore that the first cadence 3 seconds is not interrupted 2 For any automatic answering device where the requirements of 1 above are determined by other equipment e g software in a PC then the following warning notice shall be incorporated in the User Manual Some parameters required for compliance with Telecom s Telepermit requirements are dependent on the equipment PC associated with this device In order to operate within the limits for compliance with Telecom s Specifications the associated equipment shall be set to ensure that calls are answered between 3 and 30 seconds of receipt of ringing 3 An incoming call should not be answered if the primary function of the equipment is either non operational or is still in the process of resetting after release from a previous call e Examples of being non operational are as follows a A facsimile machine which has no paper or message storage facility b A modem with circuit 108 2 negated c An answering machine with no storage capacity remaining 4 Consideration will be given to exemptions from the answering delay requirements in sub clause 1 above in the following circumstances each case being considered on its individual merits a
119. ing function are characterised by the application of a D C loop and transmission termination either in response to incoming ringing or for the purpose of initiating a call 2 12 3 Bridging function 1 A bridging function involves no application of a D C loop signal and generally performs a monitoring role only With the exception of devices designed specifically to monitor ringing or on hook data signals bridging equipment relies on other separate terminating devices to provide the D C loop 22 PTC 200 May 2006 2 All customer equipment effectively performs a bridging function when in the on hook idle state and shall be tested as such The requirements are detailed as on hook requirements in subsequent Sections of this Specification 2 12 4 Series connected devices 1 Series connected devices interposed between the PSTN line and another CPE item can operate under two separate functional modes as follows a Terminating b Non terminating 2 Terminating devices Series connected equipment which has only a terminating function is characterised by the following a The line port terminates the PSTN line b The terminal equipment port presents a network like interface to the terminal device c Signals are received on one port and similar signals not necessarily identical are reproduced on the other port bi directional A common example of terminating series connected equipment is a PABX
120. inging cadences Timing requirements are given in Fig A10 3 Response shall be checked with and without the ringing detector connected for each of the 0 km 3 km and 6 km lengths of artificial line Ringing detector shall remain operational when connected 4 Response shall be checked at 6km ringing detector with CSS preamble beginning 60 ms after the end of the first ringing cadence 5 Send data to unit with incorrect checksum and confirm that information is discarded css MK DS Ban tae 180 bits Customers Calling Line Information 200 ms 0101 1111 note could be as 250 ms 150 ms short as 60ms Beginning of 2000 ms DA1 the Second 2600 ms DA2 ee 1400 ms DA3 DA4 End of the First Ringing Cadence FIG A10 TIMING DIAGRAM FOR ANALOGUE CLI SIGNALS 11 1 6 Data display Establish whether call back number displayed is identical to number to be dialled In particular check insertion of prefix digit 0 for toll calls 128 PTC 200 May 2006 APPENDIX 3 PTC200 TEST SCHEDULE TEST REPORT TO SPECIFICATION PTC 200 Product Manufacturer Product Type Serial Numbers Tested Overall Compliance YES or NO COMMENTS 2 0 2 8 2 11 1 6 7 4 0 4 1 1a 1c 1f 4 2 1a 1b 1c 4 3 4 3 1 1 129 GENERAL Electrical safety Compliance as applicable with AS NZS 3260 Limit complies Yes No Test procedure Functional tests d
121. inusoidal voltage exists which develops 1 mW in a resistance of 600 ohm 0 dBm e Since the impedance of the DUT should be DI 3 rather than 600 Q an error is introduced when measuring However this error is ignored for the purpose of these measurements b When monitoring telephone speech signals the measurement is determined by the greatest deflections on the meter occurring in a period of about 5 to 10 seconds One or two occasional deflections of unusual amplitude should be ignored c The attenuator should be adjusted until the deflections interpreted as described in 2 above just reach the scale point corresponding to reference deflection 0 VU The volume in VU is determined by the markings on the attenuator control at the setting thus obtained d If for any reason the deflections cannot be adjusted to the reference deflection the measurement is given by the algebraic addition of the attenuator setting and the actual deflection as read on the meter scale e Equivalent test results using one of the internationally recognised peak programme meters ppm will also be accepted In such cases the ppm standard used should be stated with the results so that they can be correctly evaluated e The speech recorded for test purposes should be from a standard source established by the Testing Authority for this purpose f The same recording shall be used for testing power levels and for the subjective assessment of speech quality
122. ional numbers are expected to be made available to New Zealand customers Where such numbers are available for presentation the number sent forward from the Telecom network will be in the format country code plus area code plus customer number No 00 international call prefix will be passed forward from the network As a result there could be confusion between national and international numbers on display units e When international numbers are available for presentation to New Zealand customers the number length may be any length up to 15 digits See warning note on clause 11 1 6 e The timing for such a service introduction is unknown at this stage 4 For incoming calls wholly within a Centrex group the number passed forward will be the extension number used within that Centrex customer s network The number length will be within the range of 2 to 7 digits 5 The number actually passed from the network may not relate to a specific person or line e For example where the pilot number of a DDI PABX group is passed forward a display user dialling that number is likely to reach the PABX operator not the person who originally made the call Similarly a small percentage of displayed numbers may not correspond with a number that can be called back 11 1 6 Data display 1 It is strongly recommended that the number displayed should in ALL cases correspond with the number to be dialled back by a residential or di
123. ir equipment supplied under the relaxations of this Specification and to advise their customers where there is reason to believe that such problems will occur 6 Non voice devices operating over a limited bandwidth e g 1000 Hz to 2500 Hz shall have minimum return loss of 3 dB against BT3 at frequencies outside the operating band This relaxation is conditional on any signal transmitted outside the operating band being less than 30 dBm 7 Where a hold facility is provided on any type of device the echo return loss against BT3 during activation of the hold condition shall be no less than 3 dB 8 While DTMF signals are being transmitted during the setting up of a call the minimum return loss against BT3 shall be no less than 5 dB e This relaxation does not apply to the transmission of DTMF signals following establishment of the call e g signalling CPE to CPE 4 5 2 On hook line impedance The on hook impedance including impedance of bridging equipment of any device connected to a Telecom line shall be not less than 10 kohms for the frequency range 300 Hz to 3400 Hz when measured with 1 Vims applied e This requirement may be relaxed for certain devices where it is known that they will definitely not be connected in parallel with any other device e Relaxation of this requirement may also be considered for devices using on hook data transmission see Section 11 4 6 Port impedances of series connected devices e See clau
124. is an internationally accepted method of objectively measuring the performance of telephones from the mouthpiece to a given point on the line and vice versa to the earpiece The approach enables computer controlled measuring equipment to be used for making quick accurate and above all repeatable tests e A loudness value is the result of a calculation based on fourteen separate measurements made at pre determined frequencies within the normal telephony frequency range each measurement being weighted according to its effect as perceived by the human ear when listening to normal spoken words e The loudness measurement value is actually the loss involved in the circuit under test relative to an internationally accepted reference standard Thus the higher the loudness value the quieter the perceived signal volume A negative value occurs when the loss is less than that of the reference standard e Loudness is closely related with Sidetone in any assessment of telephone performance see definition of Sidetone e See also definitions for Artificial ear and Artificial mouth Loudspeaking facility is a facility to permit several people to take part in a telephone conversation by incorporating a microphone usually but not necessarily separate from the one in the handset which is designed to pick up speech in the near vicinity of the telephone set e It incorporates an amplifier and a loudspeaker for the reception of incoming speech
125. is equipment 8 1 3 Automatic re attempts to the same number 2 Some parameters required for compliance with Telecom s Telepermit requirements are dependent on the equipment PC associated with this device The associated equipment shall be set to operate within the following limits for compliance with Telecom s Specifications a There shall be no more than 10 call attempts to the same number within any 30 minute period for any single manual call initiation and b The equipment shall go on hook for a period of not less than 30 seconds between the end of one attempt and the beginning of the next attempt 8 1 4 Automatic calls to different numbers 2 Some parameters required for compliance with Telecom s Telepermit requirements are dependent on the equipment PC associated with this device In order to operate within the limits for compliance with Telecom s Specifications the associated equipment shall be set to ensure that automatic calls to different numbers are spaced such that there is no less than 5 seconds between the end of one call attempt and the beginning of another 8 1 7 User Instructions automatic call set up b This equipment shall not be set up to make automatic calls to the Telecom 111 Emergency Service 8 1 8 Call logging automatic call set up b The call log incorporated in this equipment does not record all answered calls The call log therefore may not agree
126. is reason it is not permitted to have customer equipment incorporating constant current sinks as a means of holding the line in a seized condition This is reflected in the d c characteristic upper limit curve having a finite slope from the 20 mA minimum rather than a vertical constant current characteristic 6 Any CPE device that relies entirely on a local power source for its operation either battery or mains shall automatically release any call in progress within 5 seconds of failure of that power source e This does not necessarily apply if some functions are line powered For example a mains powered answerphone with a line powered handset does not have to release a call while the handset is being used on a call in progress e See also Section 8 for requirements for automatic calling and automatic answering devices 6 5 Hold Condition e This facility typically places a condition on the line to maintain a call in progress while the user is away from the telephone or wishes to transfer to another device connected to the same line to retrieve the call This condition typically does not apply to PABXs or other customer switching devices 1 Where a device has a manually operated hold commonly used for call handover facility such a facility shall be subject to at least one of the following conditions a Some part of the equipment such as a control switch etc shall be clearly seen to be in other than the normal idle cond
127. itches keys relays etc that are associated with a device the operation of which depend on moving parts or physical contact shall function reliably and positively at all times e Failure to do so can result in the false operation of network equipment which is liable to inconvenience other Telecom customers 12 3 Modifications 1 Any interim or temporary modifications carried out prior to submission for testing shall be detailed by the applicant This information shall be submitted to the Testing Authority and shall also accompany the documentation submitted to Telecom in support of a Telepermit application 2 In many cases modifications are suggested by the Testing Authority to enable a product to comply with the test requirements of this and any other relevant PTC Specifications Details of all such modifications shall be recorded as part of the Test Report for that product and a complete list of all modifications shall be furnished as part of the application 3 For each modification the Applicant shall submit the following information in accordance with the above a Technical details of the modification indicating both the schematic changes and the physical implementation b Details of how the permanent modification is to be incorporated into production units This shall include information on who will implement the modification c The parameters which the modification is intended to rectify e In some cases mod
128. ith the second wire serving as a ring return path Complies Yes No NA Ringing supply frequency Limit 25 1 Hz PTC 200 May 2006 Yes No NA Yes No NA Yes No NA Yes No NA Yes No NA Yes No NA Yes No NA 8 1 3 1a amp b 143 Is crest factor between 1 2 and 1 6 If No then warning notice required in User Instructions Complies Yes No NA Maximum ringing load RN With twice the value of RN determined in g in parallel with a 10KQ resistor and connected in parallel with the device does it cause ring trip Complies Yes No Ringing cadence should preferably comply with the requirements of TNA 102 clause 6 4 with a tolerance of 10 If No then warning notice required in User Instructions Complies Yes No NA AUTOMATIC CALL SET UP ANS amp RECORDING FUNCTIONS Automatic Call Set up amp Repeat Calls Call Initiation Equipment designed for automatic calling shall either Detect dial tone Introduce delay before commencement of dialling 1 sec lt Limits 7 secs Equipment shall only go off hook automatically for call attempt or On no more than two occasions for 1 5 secs each and only within 30 min period following call or call attempt Complies Yes No Automatic Re attempts to Same Number No more than 10 attempts with at least 30 secs between each attempt Complies Yes No If requirements of 1 above are determined by other device e g PC warnin
129. ition or b Some form of lamp or signal shall be provided to clearly indicate that the terminal equipment is in the bold condition 63 PTC 200 May 2006 and c The terminal equipment shall time out the hold condition and release within 3 minutes 2 When hold is activated the device shall maintain the line current at not less than 15 mA when connected to a nominal 24 V 400 Ohms source 3 Following activation of the hold condition as described in sub clause 2 above full release to the on hook condition shall occur within 500 ms of separate application of each of the following a A450 Ohms resistive shunt b The same type of terminal device connected in parallel to the same source going off hook c Disconnection of the line current source 4 It is strongly recommended that the hold condition should be inoperable if another device on the same line is off hook 5 On series connected automatic dialling devices the dialling feature shall release from the line and hand over control to the associated telephone within 1 second of sending the last digit of the called number e The Telecom network now makes extensive use of No 7 signalling such that the call may be switched through immediately the last digit is received Should the dialling function hold across the line it may prevent the associated telephone receiving sufficient line current to turn on If the called party answers immediately an
130. ity reasons Only in very specific and strongly justified circumstances are such devices acceptable to Telecom 8 1 3 Automatic re attempts to the same number 1 Automatic call re attempts to the same number shall be restricted as follows a Not more than ten call attempts to the same number within any 30 minute period and b The equipment shall go on hook for a period of not less than 30 seconds between the end of one attempt and the beginning of the next attempt e It is recommended that the period between calls to the same number be greater than the mandated minimum of 30 seconds Statistically it is likely that any call detected will still be in progress after a further 30 seconds A more realistic period between attempts is 60 seconds 2 For any automatic calling device where the requirements of 1 above are determined by other equipment e g software in a PC then the following warning notice shall be incorporated in the User Manual 79 PTC 200 May 2006 Some parameters required for compliance with Telecom s Telepermit requirements are dependent on the equipment PC associated with this device The associated equipment shall be set to operate within the following limits for compliance with Telecom s Specifications a There shall be no more than 10 call attempts to the same number within any 30 minute period for any single manual call initiation and b The equipment shall go on hook for a period of not less
131. iver shall recognise any valid DTMF signal that is present for a minimum of 55 ms as long as it is preceded by a continuous pause of at least 55 ms 5 4 Breaks in line current during signalling 1 During the switching of any call through the PSTN there may be short periods when the line current feeding CPE is interrupted Where such interruptions occur they are usually within the inter digital pauses or at the end of dialling during the call set up period 2 The dialler circuitry on any DTMF device shall be capable of tolerating line breaks of up to 50 ms at any time during call set up without affecting the signalling performance e Although this requirement is mandatory products will only be subjected to formal compliance testing if other tests indicate that performance is being adversely affected 55 PTC 200 May 2006 5 5 Automatic dialling devices 5 5 1 General requirements 1 Devices which have automatic dialling features but which do not forward a pre recorded voice or data message when the call is answered shall only be activated manually This includes devices with features such as last number re dial memory dialling automatic dial back etc e Requirements for automatic calling equipment with calling messages such as memory fax machines telemarketing equipment alarm security equipment etc are covered separately in Section 8 2 For the purpose of this clause there shall be no more than one call attempt to
132. ixed to the CPE next to the switch or If selected via software settings the user manual shall contain a warning not to use the decadic or pulse option e It is strongly recommended that the decadic or pulse option be disabled 4 It shall not be possible for any device to send DTMF signalling to line in the on hook condition e When initiated Handsfree operation of telephony devices is regarded as an off hook condition 5 The test set up for signalling tests is shown in Fig 5 1 5 2 Transmission of DTMF signalling e Reference ITU T Recommendation Q 23 5 2 1 DTMF frequencies 1 The allocation of DTMF signalling frequencies shall be as follows Low Group High Group Hz Hz 1209 1336 1477 1633 697 1 2 3 A 770 4 5 6 B 852 7 8 9 C 941 0 D 2 Each transmitted frequency shall be within 1 5 of the nominal frequency 3 DTMF signalling devices shall support at least the 10 numeric digits plus and symbols 53 PTC 200 May 2006 s The Al B C and D are rarely used at the date of issue of this Specification 5 2 2 DTMF signalling requirements 1 For optimum performance all transmitted DTMF frequencies shall comply with the requirements of this Specification at all line currents in the range 20 mA to full current 2 All devices shall satisfy the following requirements during the transmission of DTMF signalling a The impedance of the equipment
133. lected the purpose for its collection how it is used and what is disclosed to any other party 4 There are two basic categories of two way recording device as follows a An answering machine with the facility to record complete conversations The technical requirements for answering machines detailed throughout this Specification shall apply to such devices b A recording device designed to bridge a telephone line Such devices shall comply with the requirements of this Specification 85 PTC 200 May 2006 9 BILLING SECURITY 9 1 Cordless devices 1 Cordless devices include the following types of equipment a Simple cordless telephones with one portable unit dedicated to one base unit CT1 b The more complex arrangements such as CT2 and CT3 multiple user systems 2 Cordless devices shall incorporate a security system which will as far as practicable eliminate the risk of other similar devices accessing the transmission of speech or other communications Such security systems fall into one of the following categories a A system of security codes which satisfies the requirements of clause 9 2 b A process accepted within the industry as being highly secure Such a process will be subject to acceptance by Access Standards e An example of an acceptable highly secure process is the DSS system 9 2 Security codes for cordless devices 1 The following requirements relating to the use of security c
134. ll be performed at 25 mA line current 5 2 2 Gel A test frequency of 1 kHz shall be used for the test to satisfy requirements of clause 4 3 2 2 5 5 1 Automatic dialling devices general requirements Functional check and timing only required 5 5 2 Caller display equipment Functional check only required 6 2 Function of d c line feed polarity reversals 3 It will not be necessary to repeat all tests with the line polarity reversed Having confirmed compliance with other performance requirements using a particular line polarity a simple functional test with the polarity reversed shall be carried out to ensure that transmission and signalling are operational 3 wire devices only Device under test Jackpoint FIG A3 TEST SET UP FOR D C CHARACTERISTICS 118 PTC 200 May 2006 6 3 Off hook d c line Characteristics The DC characteristics shall be tested using the set up shown in Fig A3 The voltage and current measurements shall be taken with the resistance Rx set to 2600 Q 1750 Q and 350 Q respectively approx 15 mA 20 mA and 45 mA 6 5 Hold condition if provided 2 With the hold facility activated the off hook line current shall be adjusted to 20 mA by varying Rx with the device connected to a 400 Q 24 V dc source ref Fig A3 The line current shall be checked when an additional 40 Q resistor is placed in series with the source and the source voltage is reduced to 21 V e The above t
135. ly Teminal eguipmert To other Teminal Eqguipm ert Teminal Ports eguipmert port Te minal device Seres connected device with Other multiple ports ben nal eguipmert ports FIG 6 3 SERIES CONNECTED DEVICE TEST SET UP 3 For connections between the line port and each terminal port of multiple port devices the requirements of sub clauses 1 and 2 above shall apply see Fig 6 3 e This ensures that the local exchange will not detect any in rush current caused by the capacitive loads as an off hook condition The time at which a connection is made to the terminating equipment cannot be clearly defined and may be outside the period during which the local exchange equipment is desensitised to in rush current 4 All series connected equipment shall in conjunction with any terminating device satisfy the requirements of clauses 6 3 to 6 8 e For 2 wire 4 wire 2 wire devices see Fig 4 5 in Section 4 the 2 wire PSTN line port provides termination of the d c path and it is important that it satisfies all d c requirements even though it is not strictly functioning as a terminating device 5 For some series connected automatic dialling devices when dialling it is necessary for both the device and an associated telephone to terminate the line at the same time Depending on the characteristics of the telephone this may present difficulties as there may be insufficient current to serve bot
136. ly be connected to the network ref Specification PTC 100 e The only exceptions are those devices supplied by Telecom or NZ Post Office prior to 1 May 1988 and those classes of product listed as exceptions in Specification PTC 100 12 PTC 200 May 2006 1 4 Exclusions Devices designed to be acoustically coupled to telephony devices are excluded from coverage by a Telepermit Telecom accepts no responsibility for the quality of signals transmitted or received via any acoustically coupled device 1 5 Compliance with International standards 1 As far as is practicable Telecom complies with ITU T Recommendations in the design of its network and the requirements of its PTC Specifications Reference is frequently made to specific Recommendations throughout this Specification Such references indicate the Recommendation current at the date of issue of this specification 2 Also wherever possible Telecom endeavours to harmonise Telepermit requirements with equivalent overseas specifications This particularly applies to Australian Communications Industry Forum ACIF requirements e The original issues of PTC Specifications were harmonised with British Standards as far as possible owing to the fact that the Telecom network design was originally close to that of British Telecom It is now New Zealand Government policy to align Australian and New Zealand Standards wherever possible Complete alignment however is not practicable due to fund
137. m of equipment In such cases the complete unit will be regarded as an answering machine Artificial ear is a measuring device the input of which has an acoustic impedance equivalent to the acoustic impedance of the average human ear and forms part of part of an artificial head e It comprises an acoustic network and a measurement microphone which permits calibration of earphones used in audiometry and telephony and is used in the measurement of loudness rating e Reference ITU T Recommendations D 57 1993 and P 65 1993 Artificial head is a purpose designed jig which includes the artificial ear and mouth and ensures that they are in the correct relationship for measurement of the loudness rating of telephones s The head also provides facilities to clamp a telephone handset in the designated speaking position e The equipment includes computer controlled frequency generators and amplifiers audio spectrum analyser and other specialised electronic test equipment all set up to provide rapid and accurate measurements of the various performance parameters Artificial mouth an electro acoustic transducer used for the testing of microphones at close speaking distances and forms part of an artificial head e Reference ITU T Recommendations D 51 1993 and P 65 1993 Auto answering is the procedure by which equipment automatically answers an incoming call on detection of the ringing voltage Auto answering mode is the mode in
138. mber received from the network comprises 7 digits or less e Such short numbers indicate either a Centrex call or an incoming international call for which the number is not available 6 For international length numbers an adjunct caller display unit should be capable of storing and or displaying up to 15 digits If a dial back feature is provided on such units the digits OO should be inserted as the first digits for all cases where the number received from the network comprises 11 or more digits e The majority of numbers of this length will in due course represent international incoming calls e Note that there may be some incoming international calls which result in number lengths of less than 10 digits but these are expected to be in the minority Typical examples are those from the Pacific 57 PTC 200 May 2006 Islands 7 Display units providing auto dial back facilities may also provide the following facilities a For dialling local numbers a device may be programmed to automatically delete the 0 prefix and area code digit and dial only the 7 digits of the local number e It should be noted that every area code used in the Telecom PSTN serves more than one local calling area Any dial back logic will thus need to examine the one digit area code and one or more digits of the following 7 digit number in order to accurately determine whether the number received from the network relates to a local call Since the d
139. metric noise power level to line in Off hook state Limit lt 60 dBmp Signal to Noise Ratio of recorded speech or music in 0 1 5 KHz band Limit gt 20dB One minute mean off hook noise power above 4 kHz Limit below limits in Fig 4 2 The individual power level of any extra neous frequency in 0 3 5 kHz range during signalling Limit gt 20 dB below One minute mean Signal to noise Ratio during signalling Limit gt 20 dB Crosstalk isolation for multi line device in 0 3 3 4 kHz range Limit gt 50 dB Distortion Total send harmonic distortion of recorded speech in 0 3 3 4 kHz range Limit lt 10 Total send harmonic distortion introduced by non terminating serial device Limit lt 5 Line impedance of the device OFF HOOK line impedance Min Return Loss in 0 3 1 kHz range Limit gt 10 dB Min Return Loss in 1 3 4 kHz range Limit gt 12 dB note Return loss figures from 300 Hz to 1000 Hz at 100 Hz intervals and 1000 to 3400 at 200 Hz intervals to be attached Echo Return Loss Limit gt 14 dB Is the warning notice required Limit YES or NO PTC 200 May 2006 Yes No Yes No Sc ii 4 5 2 4 6 4 6 1 131 Minimum Return Loss BT3 relaxed Limit 28dB or N A Minimum Return Loss 6009 relaxed Limit gt 16dB or N A see note for 4 5 1 2 Minimum Return Loss FRG relaxed in 300 600 Hz range Limit gt 10 dB see note for 4 5 1 2
140. mpatibility aspects are dealt with in this Specification Typical examples are ringing loading and sensitivity and D C characteristics Similarly some potential problem areas are covered by notes or recommendations Nevertheless it is not practicable to guarantee inter compatibility for the vast number of potential CPE combinations connected on any line 1 13 Ongoing compliance Where modifications are necessary for products under test to comply with Telepermit 15 PTC 200 May 2006 requirements ref clause 12 3 the modifications shall be applied to all items supplied to the market For ongoing compliance such modifications shall be applied to all future batches of the product supplied 16 PTC 200 May 2006 2 GENERAL 2 1 Mode of presentation 1 The requirements of this Specification are printed in plain type with each paragraph formally numbered Informal comments recommendations and explanations which are added only as indications of the means of compliance with this specification are shown in italics Smaller type is used and each paragraph is preceded with a symbol instead of a clause number 2 Mandatory requirements are indicated by use of the verb form shall and clauses including such requirements are highlighted as demonstrated here 3 Voluntary and preferred requirements or recommendations are indicated by use of the verb forms should or may 4 While the clause numbering basic format used in this Specific
141. nditions shall apply a Where the line grabbing function is designed to seize the line even when another call is in progress the equipment shall terminate the existing call by opening the loop for at least 2 seconds before initiating the next call b To initiate a subsequent call the equipment shall comply with the call initiation requirements of clause 8 1 2 1 e It should be noted that a few older generation Telecom exchanges provide for a calling party to hold a call for up to 8 seconds when the called party breaks the connection In such cases a line grabbing device may not be able to release an existing call and initiate a new call unless a suitable delay is incorporated or several attempts are made and dial tone is detected before signalling commences 2 Line grabbing equipment designed to make automatic test calls shall incorporate in the User Instructions suitable information advising the customer of the conditions to be experienced if they are using the line when a test call occurs Routine test calls should preferably be delayed until the line is free e Disconnecting or dialling over a call in progress inconveniences customers and is only really necessary in an emergency 3 The following warning notices shall be inserted in the User Instructions for all line grabbing equipment This equipment is set up to carry out test calls at pre determined times Such test calls will interrupt any other calls that may be set
142. ndix 2 e In some cases the line ports of series connected devices are not expected to be connected in parallel with other devices However the possibility of this occurring has to be allowed for 7 7 3 Devices with terminating facility Series connected devices capable of a terminating function shall comply with the requirements of clauses 7 5 and 7 6 7 7 4 Terminal equipment or extension ports 1 Series connected equipment shall not connect ringing to any terminal port which is in the off hook condition Similarly after ringing has been applied to a port it shall be disconnected within 100 ms of detection of an off hook condition e This requirement applies to the application of either network ringing or locally generated ringing 2 Series connected equipment designed to extend calls to a terminal equipment port via a 4 wire path shall be capable of reproducing at the terminal equipment port the original ringing cadence received at the PSTN line port The timing distortion of the cadence produced between the two 2 wire ports shall not be in excess of 5 e If timing distortion is excessive it is recommended that the correct cadence is regenerated 7 7 5 Locally generated ringing On series connected devices which generate their own ringing for local use and do not simply extend the network ringing to the associated CPE the local ringing source shall satisfy the following requirements a The ringing supply shall c
143. ne Systems a This Specification covers most types of analogue devices intended for connection to the Telecom PSTN or to PABX systems in customers 11 PTC 200 May 2006 premises It also includes coverage of the most significant aspects of more simple PABX KTS systems categorised as Type 2 b For Type 1 PABX KTS systems this Specification covers the basic requirements of trunk interfaces for connection to PSTN lines All further PABX requirements are covered separately by the Specifications PTC 220 and PTC 107 e See Section 3 for definitions of Type 1 and Type 2 PABX KTS systems 1 2 Electromagnetic interference EMl 1 2 1 Radiated energy requirements 1 All equipment used in New Zealand shall comply with the Radio Communications Act 1989 the Radiocommunications Radio Regulations 2001 and any subsequent Gazetted Notices as regards radiated energy These requirements are administered by the Ministry of Economic Development and responsibility for such compliance rests with the Telepermit applicant under a supplier self declaration scheme This applies to all telecommunications CPE e In particular any microprocessor based equipment is likely to give rise to unwanted radiation and it is necessary that EMC compliance is confirmed by a formal test process before any equipment is released onto the New Zealand market 2 Ministry of Economic Development EMC compliance requirements are not part of Telecom S requiremen
144. ne for telephony devices AAA 48 4 11 1 Significance of sidetone EE 48 4 11 2 Optimum sidetone performance sees eee eee ee 48 4 11 3 Sidetone Masking Rating GTM 49 EE Teil TTT 49 4 13 Acoustic shock protection sss 49 4 14 Adjustable volume controls on telephony devices 49 4 15 Telephony security in on hook condition sees eee eee eee 50 4 16 Recorded message Oualtv rt trtrrnnnnnn rrn rrreennn 50 B Se IRSCH GEMENG ere deed 52 SE Signaling types sei a eeaeee ete 52 5 2 Transmission of DTMF signalling sss eee eee eee eee 52 5 2 1 DIMF HEIEREN sese 52 5 2 2 DTMF signalling requirement sss eee eee eee eee eee 53 523 e IB le D 53 5 2 4 Series connected eutpment eee eee eee 53 5 2 5 Speech circuit SUPPFESSION eee 53 537 Elke 54 5 4 Breaks in line current during aonallmg eee 54 5 5 Automatic dialling ELE 55 5 5 1 General requirements eee eee eee ee 55 5 5 2 Caller display equipment eee eee eee 56 5 5 3 Non code access to other networks eenen 57 5 5 4 Manual insertion of additional dote 57 5 5 5 User instructions wind hanenn e ne eel mal cite a a a mil A E ER 58 57 0 e BE EE 59 5 7 1 International standard layout 59 5 7 2 Tactile performance and service ie 59 6 DiC lCHARACTERISTICS EE 60 6 1 GPE power supply methodS EEN 60 6 2 FUNCHON Belge Ee EE 60 6 3 Off hook d c line characteristics sse eee 60 6 4 Supervisory EEGEN 62 Bio Hold EEN WEIER 62 6 6 Line TTT 63 4 PTC 200 May 2006 6 7 On ook line currente
145. network consisting of a 370 Ohms resistor in series with a parallel combination of a 620 Ohms resistor and a 310 nF capacitor see Fig 4 3 This network is known as BT 3 for convenience e This impedance network was originally used by British Telecom 41 PTC 200 May 2006 e The impedance of a telephone instrument is also of extreme importance when connected to any private network or PABX Incorrect impedance can result in excessive sidetone echo and or instability problems 620 n oro n 310 nF FIG 4 3 IMPEDANCE REFERENCE NETWORK BT 3 2 Apart from the exceptions described in sub clauses 4 to 8 below the minimum return loss of the line port of any device against the impedance BT 3 shall be no lower than the following limits for line currents of 20 mA and 80 mA a 10 dB at any frequency in the band 300 1000 Hz b 12 dB at any frequency in the band 1000 3400Hz 3 Apart from the exceptions described in sub clauses 7 and 8 for telephony devices the echo return loss against the impedance BT 3 shall be no less than 14 dB e Echo return loss is derived from the return loss at individual frequencies using the same formula as that described in ITU T Recommendation G 122 1993 Annex B 4 for the derivation of echo loss 4 For non voice devices the impedance requirements are relaxed from those stated above and are as stated in sub clause 5 below However where a device meets only these relaxed requirements
146. nfused with the separately defined Loudspeaking facility e With the handsfree facility the only microphone provided is that within the handset and the loudspeaker is disabled whenever the handset is off hook Headset is an assembly comprising transmit and receive transducers but without signalling ringing or full transmission circuitry designed for fitting on the user s head in order to leave the hands free for other activities Hold is any temporary condition applied to a line while a call is in progress to maintain that call and permit its subsequent retrieval Hookswitch is the general term covering any switch or other device which is operated when the handset is returned to its normal rest position e Hookswitch includes any control buttons used to initiate or terminate a call and also includes any switch feature of one piece or novelty telephones which performs the ON OFF function e See also definitions for On Hook and Off Hook Hookswitch flash is the momentary operation by the user of the Hookswitch to perform a re call or similar function e This causes a brief interruption to the line current but the duration is not long enough to be detected and interpreted as the completion of the call Informed user is a person who is familiar with the use of certain non standard specialised equipment in order to initiate or receive calls e This term includes users who are situated remote from the specialised te
147. ng Rating STMR against BT3 against 6000 Limit for BT3 2 7 dB Instability Stability under operating conditions Limit stable behaviour Stability terminated with 270Q Limit compliant YES or NO Stability terminated with 1 6kQ 510nF Limit compliant YES or NO Acoustic Shock Protection The sound pressure at the earpiece Limit 118 dB 111 dBA headsets Adjustable Volume Control 4 2 to 4 13 must be tested with the minimum and the maximum settings Limit compliant YES or NO The volume control should not affect compliance with d c voltage or the send performance characteristics Limit compliant YES or NO Telephony Security while on hook On hook coupling from the line There shall be no evidence of coupling Limit compliant YES or NO Yes No Yes No Yes No Yes No Yes No Yes No PTC 200 May 2006 4 16 1 5 0 5 1 3 5 2 5 2 1 1 2 134 Recorded Message Quality Intelligibility of recorded message to the distant party Limit suitably intelligible YES or NO SIGNALLING REQUIREMENTS Signalling Types Decadic signaling disabled or suitable warning provided Limit compliant YES or NO On hook signalling should not be possible Limit compliant YES or NO Transmission of DTMF signalling DTMF Frequencies The Low Group frequencies shall be as follows line current 80 mA 697 Hz 770 Hz 852 Hz 941 Hz Limit
148. ngement shown in Fig A6 calibrated as in 1 a above should be used Switches Sw1 to Sw10 should then be opened and the cadence switch operated to apply 40 ms bursts of ringing 4 To test impulse immunity the equipment is connected to the test set up shown in Fig A7 Sw1 is switched on for 35 ms off for 65 ms 10 times followed by a break of 750 ms This sequence is repeated 10 times Record whether or not the ringer operates when this sequence is applied 122 PTC 200 May 2006 CPE only 2 wire socket FIG A7 IMPULSE IMMUNITY TEST SET UP 7 5 3 Ringer Loading Connect the Device under Test DUT as in Fig A6 calibrate as per clause 7 5 2 1 a and open switches Sw1 Sw10 a If the measured voltage falls below 107 V p p when connected the ringer loading and the resultant RN is to be assessed as greater than 5 and the ringer is failed for excessive loading b If the measured voltage is above 107 Vp p when connected then switches Sw1 Sw10 are to be closed one by one until the it falls below 107 Vp p One switch is then opened again The Ringer Loading number RL is defined as follows RL 10 minus the number of loads switched in 2 7 6 Ringing Number RN The Ringing Number RN is defined as the higher of the Ringer Loading Number RL the Ringer Sensitivity Number RS If the resultant RN is zero then it shall be rounded up to a value of 0 5 PTC 200 May 2006 123 LNG p jp uuog S
149. nterface is a company or industry interface that does not conform to national or international standards e A proprietary interface may conform to an industry standard not used by Telecom but proprietary to a particular manufacturer Such an interface may be acceptable for Telepermit purposes if it is not used for direct connection to an interface specified Telecom Psophometric is the term used to describe a method of measuring noise within the speech band while weighting the value of each frequency component present in accordance with its relative effect on the human ear e Such measurements are made with a psophometer which is a voltmeter fitted with a standardised frequency weighting network and calibrated to indicate noise power in psophometric units dBmP e The weighting coefficients defined in ITU T Recommendation O 41 1994 for telephone circuits and weighted to a reference tone of 800 Hz are used by Telecom for telephony purposes PSTN is the Public Switched Telephone Network e New Zealand s PSTN services may be provided by a number of different Network Operators see also Telecom PSTN Quantity is any batch order or shipment from which a sample is drawn e The word Quantity is used to avoid any confusion with the formal meaning of the word batch to quality assurance personnel Recall is the procedure used to re connect the register function of a switching system to enable additional features of that system to be
150. o the Telecom network is now 2 wire and all new devices should be compatible with this arrangement e This is in line with most international standards 2 The previous Telecom standard was a 3 wire parallel connection arrangement which included provision of a ringer capacitor a surge suppressor and an out of service resistor in the network termination Master Socket e Further information is given in Specification TNA 102 Section 9 3 3 wire connected CPE is no longer acceptable for Telepermitting purposes 10 2 Connection methods 1 The primary method of connection of terminal equipment is via a plug to BS 6312 1985 with the latch adjacent to plug pin 6 The plug mates with a standard Telecom socket which terminates the customer s premises wiring e The plug to BS 6312 1985 is commonly known as a BT plug 2 a The socket plug pin numbering is as follows Pin 1 not used Pin 2 A wire Pin 3 not used Pin 4 not used Pin 5 B wire Pin 6 not used e It should be noted that the present terminating hardware used by Telecom in customer premises wiring introduces another numbering reversal between the socket pin numbers and the wiring terminal numbers see TNA 102 clause 9 3 2 Suppliers should be aware of this potential source of confusion b The A amp B wires referred to socket pins 2 amp 5 are the two wires of the line to the Telecom local exchange and they form the basis of the 2 wire connection m
151. odes apply as appropriate a No less than 8000 security codes shall be provided to control radio frequency access between a portable handset and its base unit s e This is required to minimise the risk of fraudulent calling by any person roaming with a cordless handset or inadvertent access to an adjacent base station of the same make and model over a common radio channel e The requirement for the increased number of security codes from the 1000 minimum proposed in November 1995 recognises the continuingly increasing numbers of cordless telephones in service in urban areas e It is estimated that there may now be 100 000 or more of the most common models in service on the Telecom network The 8000 codes now called for together with the number of selectable frequencies available and the geographical location factors ensure a security probability closely aligned with the ACA requirement without being excessively restrictive b The applicant shall state in the User Instructions the number of discrete codes that are available to each model for which a Telepermit is required c The applicant shall describe in general terms how the security codes are allocated Also a written assurance shall be given stating that allocation of those security codes is randomly spread over the entire range specified by the manufacturer e For example are they pre allocated by the manufacturer on a truly random basis or are they generated within the
152. oes device perform basic functions satisfactorily If answer is No are functional limitations covered by warning notice in User Instructions TRANSMISSION REQUIREMENTS General Number of samples Tested For electro acoustic device Limit 3 or N A For other device Limit 1 or N A Indicate No tested Receive Volume Control tests carried out for all settings Limit PTC200 Ministry of Commerce Compliance Limit RFS29 Transmitted Power Limitations Signals to line of more than 5 seconds Limit lt 9dBm Signals to line of less than 5 seconds Limit lt 4dBm The maximum instantaneous peak power Limit lt 0dBm Signal limitations to line on any acoustic stimulus Limit 10dBV Any recorded message or voice signal transmitted Limit 6 to 16VU Pre recorded music synthesised music or composite speech and music signals Limit 12 to 25VU Noise and Crosstalk On Hook Noise and Crosstalk The psophometric noise power level to line in on hook state Limit lt 65 dBmp PTC 200 May 2006 Yes No Yes No Yes No NA Yes No NA Yes No NA 4 3 2 1a 1b 1d 2a 2b 4 3 3 4 5 4 5 1 2a 2c 130 One minute mean on hook noise power above 4 kHz Limit below limits in Fig 4 2 With room noise background conversation at approx 65 dB SPL is on hook coupling to line lt 65 dBmp Off Hook Noise and Crosstalk The psopho
153. of this is a facsimile machine with an integral one piece telephone Any Telepermit granted for such telephones will be as part of the facsimile machine not as a stand alone telephone instrument e A further example is a device connected to a PABX or KTS by means of a proprietary interface Similarly such a device will be treated as part of the PABX or KTS c Devices categorised as PABXs or key telephone systems which are designed to be hard wired to PSTN lines via a distribution terminal 6 All types of plugs or circumstances not covered by sub clauses 1 to 5 above shall be regarded as unacceptable for Telepermit purposes e This exclusion applies also to the commonly known RJ11 or RJ12 miniature 4 way or 6 way versions plug which will physically mate with an RJ45 socket This combination is not considered satisfactory as the plug is insecure when in position and the plug moulding may overstress the outer springs of the socket 10 3 Series connected devices 10 3 1 Line grabbing connections 1 Some series connected devices incorporate a line grabbing function whereby all other equipment normally connected is isolated from the line It is necessary to connect such equipment on the network side of all installed sockets and the following connection arrangements shall apply a Detailed instructions shall be given on the correct method of installing the equipment and either i These instructions shall nominate the actu
154. offered As a result a number of variants may qualify for individual Telepermits based on the one series of tests e To be regarded as the same electro acoustic design the variants of any telephony device concerned shall use the same types of transducers microphone and receiver the same handset geometry and construction and the same associated transmission and signalling circuitry For other categories of product the same line interface circuitry should be common to all variants 2 This also applies where two or more versions of equipment are marketed and the only difference is in the quantity of identical modules used 3 In assessing the test results the Testing Authority shall be satisfied that the same basic design is used and that all variants meet the requirements of this Specification 4 A separate Telepermit will usually be issued for each functionally different model so that the general conditions of the Telepermit system can be applied independent of the performance of other models 2 6 Disabling of prohibited features 1 Some devices originally manufactured for overseas applications incorporate features which are either prohibited or incompatible with the Telecom network 2 User Instructions for such devices shall either completely omit reference to the facilities in question or clearly explain that they are not available on products intended for connection to the Telecom network 3 It is strongly recommended th
155. ok condition c However is normally maintained by the very small current flowing when the customer equipment is on hook 2 For both line and locally powered equipment satisfactory performance is dependent on the d c characteristics of that equipment satisfying the off hook requirements of clause 6 3 3 With certain exceptions see sub clause 4 below all customer equipment shall continue to operate normally and the requirements of this Specification shall be met independently of changes to the d c line conditions described in Section 4 of Technical Document TNA 102 Typical changes are short breaks transient voltages line polarity etc Changes to line polarity may occur as follows and customer equipment shall not be affected by such changes a Rearrangements within the network may result in reversal of the line polarity Customer wiring also does not necessarily maintain polarity b Line reversals can occur before during or after the application of ringing and at other times during a call 4 Some locally powered devices are dependent on a particular line polarity e g some PABXs etc for correct operation This requirement shall be made clear to both customers and installers and the matter will need to be discussed between installers and local Telecom staff at the time of installation 6 3 Off hook d c line characteristics 1 For all devices designed for connection to a PSTN line to ensure satisfactory opera
156. omply with the electrical safety requirements of AS NZS 60950 b The ringing voltage and duration shall comply with the requirements of AS NZS 60950 c Ringing shall be connected to the port as a loop connection i e one terminal of the ringer supply connected to one wire of the port with the other wire serving as a ring return path to the other side of the ringer supply d The ringing frequency shall be 25 1 Hz e The crest factor of the ringing waveform shall be checked and should preferably be 77 PTC 200 May 2006 between 1 2 and 1 6 s The crest factor is defined as the ratio of the peak to r m s voltage and this equates to a value of 1 414 for a pure sine wave e Some telephone devices tend to be subject to premature ring trip when subjected to square wave ringing signals f If the crest factor is outside the limits stated in e above then the following warning notice shall be included in the User Instructions Difficulties may be experienced with this device ringing some types of telephone connected to it If this problem occurs it should be referred to the equipment installer The matter should NOT be referred to Telecom Faults Service g The ringing output shall be rated for the aggregated RN of the CPE which will respond reliably to ringing This is defined as the number of 0 5 uF 1loads across which the ringing source can maintain 107 Vp p divided by 2 h The application of a load of twice
157. onents on a telephony device shall be capable of reproducing audible or intelligible speech while that device is on hook and there is conversational speech present from another device connected to the same line e An example of this is a ringing detector which responds to speech signals present on the line while the device is on hook e This requirement relates to potential eavesdropping whereby the telephone in its on hook condition could provide a source of signals to an unlawful listener 4 16 Recorded message quality 1 The speech quality of any recorded message transmission shall be suitably intelligible to the party on the other end of the call e Reference clause 4 2 for power level of stored message transmissions e Reference clauses 4 3 amp 4 4 for noise and distortion requirements 2 Overall speech quality will be assessed subjectively by the testing authority and in any cases of doubt finally assessed by Access Standards at the time of application e A suitable quantitative means of assessment may be introduced at some future date e Quantitative or subjective mean opinion score assessment of speech quality is extremely complex and would be costly to the applicant For this reason no formal qualitative requirement is stated in this Specification 3 Telecom reserves the right to re assess the quality of the recorded speech transmission of any product after the grant of a Telepermit if there is evidence of sub
158. ook line current for the maintenance of memory information The line feed provided by series connected switching devices shall either a provide a d c power source capable of supplying a continuous on hook current of at least 150 pA in order to maintain such memories or b have a clear warning inserted in the User Instructions advising users that such terminal devices used with the series connected device may lose their memory functions e Series connected devices without switching facilities will normally apply feed voltage to all terminal CPE ports in the on hook condition anyway 7 The User Instructions shall give some indication of the maximum number of 68 PTC 200 May 2006 parallel CPE devices that can satisfactorily be operated on one port This number of devices however is subject to the limitations of clause 7 7 2 which means the maximum will never exceed 4 or 5 e Individual items of CPE are normally restricted to drawing no more than 120 UA from the line in the on hook condition This limit may be used as a means of establishing the number of items likely to operate 6 11 Fail safe requirements 6 11 1 All customer equipment 1 On restoration of power after a power failure all equipment powered by a c mains shall comply with the following a Revert within 5 seconds to or continue in the on hook state without seizing the line and b Remain in the on hook state until another incoming or outgoing call i
159. perform the tests It is recommended that specific complexities be discussed with Access Standards in the first instance particularly if the device incorporates any process such as adaptive self adjustment of its parameters e This applies particularly if the device is dependent upon host equipment for operation 4 The Testing Authority may be able to modify the device temporarily to meet the Telepermit requirements but is under no obligation to do so Full details of such modifications shall be included with the test report and furnished as part of the application e Such modifications are likely to increase the cost involved and the overall time taken for the testing process 21 PTC 200 May 2006 5 Tests and measurements are to be carried out with the equipment functioning normally and the relevant requirements of this Specification shall be complied with under normal working conditions Where appropriate the following shall be made available to the Test Laboratory a Information on the most suitable means of disabling any automatic facilities during the test programme e Unless suitable procedures are provided by the supplier it may be necessary for the Testing Authority to spend additional time defining suitable test methods Such activity will normally result in additional cost to the Applicant b Any equipment or software necessary for the initialisation of the device under test e Some equipment is dependent on an ex
160. pment is to be used with a separate external power supply the combination of equipment plus power supply shall comply with the requirements of AS NZS 60950 and AS NZS 3260 1993 Compliance testing to AS NZS 60950 may only be undertaken by an IANZ registered laboratory one which has been accredited by an IANZ affiliated laboratory registration authority or one which is recognised by the Operations and Risk Management Division of the Ministry of Economic Development 2 Where the equipment is to be used with a separate external power supply and a non proprietary power supply is used the operating voltage and current rating and preferably the polarity of the connector should be marked on the case adjacent to the socket concerned e This recommendation avoids the risk of an unsuitable power supply being connected via a standard or commonly used type of connector 3 Where a battery charger is used and this can be connected to the equipment while the equipment is simultaneously connected to the Telecom PSTN line such chargers shall comply with the requirements of AS NZS 60950 and AS NZS 3260 1993 2 8 3 Earth connections 1 Where for any reason an earth connection is necessary for the correct operation of any equipment the requirements of AS NZS 60950 shall be complied with e Suppliers should note that such telecommunications equipment is referenced to both the local earth and the remote telephone exchange earth In the event of po
161. pted for products with layouts that are numerical only or that are similar to the above but with Q and Z on digit 1 or with Q and Z omitted 4 Equipment that does not use a keypad for sending e g modems and PC s shall be exempt from the requirement to comply with the above layout 5 6 2 Tactile performance and service life There is no formal requirement for keypad performance e The operating life of a keypad its construction and function are all regarded as marketing features 60 PTC 200 May 2006 6 D C CHARACTERISTICS 6 1 CPE power supply methods Customer premises equipment connected to a PSTN line may be powered by two alternative methods as follows a Line powered which relies entirely on the d c supplied from the line for all its electrical functions b Locally powered which has its own power source for the main functions i e speech transmission etc but relies on the line feed for supervisory functions e Locally powered includes battery powered devices such as some types of Caller Display Units 6 2 Function of d c line feed 1 For line powered devices the d c line feed from the exchange performs two basic functions by providing power for the following a Supervisory and signalling functions b Speech signals and general operation of customer equipment c Maintenance of memory facilities in customer equipment e a and b are dependent on d c line current in the off ho
162. quirements The requirements for general operation stated in clause 7 5 1 shall be applied equally to series connected devices 74 PTC 200 May 2006 Kont Ringing Ringing Detector Generator Ringing a Detector Teminal a P equipment PSTN Line Line port port Teminal Series connected device device in teminating mode Ringing Detector Teminal NJ equipment port _Lowserles Impedance Cd PSTN Line High shunt l impedance Teminal Series connected device device in non terminathng mode FIG 7 2 TERMINATING amp NON TERMINATION SERIES CONNECTED DEVICES 7 7 2 Devices without a terminating facility 1 Series connected devices which do not have a terminating facility shall be tested using the test set up shown in Fig 7 3 Details of the test methods are given in Appendix 2 2 All such series connected devices shall be allocated a ringing number RN as described below 3 All such series connected devices shall extend ringing to their terminal equipment ports such that a ringing load Law having a total RN of not less than 4 shall operate satisfactorily when ringing is applied to the line port The ringer loading number RL of the series connected device shall then be derived as follows RL 5 Lrn e This means that the Ringer Loading of all such devices cannot exceed a value of 1 75 PTC 200 May 2006 I PTC 200 August 1997
163. recorded voice message is used this shall comply with the following a It shall provide clearly the identity of the caller b It shall be repeated at least once 2 Automatic calling equipment designed for attended operation shall provide an audio monitor during the call set up phase e This enables the calling party to identify that a wrong number has been called and avoid repeat calls to the same number 3 In the case of a facsimile machine with automatic dialling facilities the identification tone known as CNG tone shall be provided as per ITU T Recommendation T 30 The implementation of CNG tone is mandatory for all facsimile devices 80 PTC 200 May 2006 e Facsimile calls are often manually set up on a call by call basis but automatically executed including re tries on an unattended basis Accidental calls to ordinary telephone customers can at least be identified by those customers by the presence of the CNG tone 8 1 7 User Instructions The user instructions associated with automatic calling equipment shall a Include a statement to the effect that such equipment should not be used under any circumstances which may constitute a nuisance to other Telecom customers b In the case of voice equipment clearly state the following This equipment shall not be set up to make automatic calls to the Telecom 111 Emergency Service e Under Telecom s terms for the provision of service no Telecom customer i
164. rect line user To achieve this the digit insertion rules of clause 5 5 2 apply 2 Where the display does not correspond exactly with the number to be called back the need to insert prefix es for manual dialling shall be explained in the user instructions see clause 5 5 5 e Displaying the number complete with any necessary prefixes is most likely to avoid users calling the wrong numbers 96 PTC 200 May 2006 e Some display units will be capable of storing any digits which exceed the display length and or any prefix digits that are automatically inserted for dialling back to the calling number Nevertheless it is preferred that the display matches the actual number to be dialled in all cases This will minimise any potential confusion for users e Business customers connected to Centrex or PABX extensions will also need to dial a trunk access prefix The capability to insert this prefix is regarded as a marketing feature 3 Where 0000 is displayed for incoming international calls and not translated into some form of informative text the significance of the 0000 should be explained to the user 4 The provision of a display facility on analogue CLI devices is not mandatory as it may be provided separately on other associated equipment such as PC s In such cases an interface such as V 24 RS232 will be necessary Wherever provided the following display functions are recommended a Minimum display of time date and
165. rements of this Section The device shall be tested at each combination of transmit bit rate and type of modulation available Where the transmit rate is continuously variable the highest bit rate shall be used 2 For a series connected device providing a proprietary interface for a terminal device the combination of terminal and series connected devices shall comply with the applicable requirements of this Section e A typical example is a PABX with a system dependent extension phone 37 PTC 200 May 2006 3 Except where otherwise stated the test set up for transmission testing shall be as indicated in Fig 4 1 Cry used for J wire devices NSTRUMENT ART FICIAL DEY ICE or LINE GN AL 0 3 6 km GENERATOR see Fig A1 D an specifiedfor particular test gt 10H A 400 te where x value necessary to achieve specified line currert 10 H Ps Nde The 400o includes total resistance of inductors FIG 4 1 a TEST SET UP FOR TRANSMISSION TESTS 4203 12 5 nF i 12 5 nF 4203 FIG 4 1 b ARTIFICIAL LINE SEGMENT 0 5 km Line Length 4 2 Transmitted power limitations 1 Signals transmitted to line from any device shall not exceed the following limits a Signals of more than 5 seconds duration shall not exceed a level of 9 dBm when averaged over 1 minute e Special consideration may be given for a relaxation of this limit to a level between 4 dBm and 9 dBm for signals of between 5 and 30 seconds duration
166. ringing is applied Limit lt 3 sec The compliance to ringing cadence ON period 360 ms lt Limit lt 440 ms Is the ringer compatible with 20 ringing signal deviation 320 to 480 ms Yes No N A Is the ringer compatible with 30 ringing signal deviation 280 to 520 ms Yes No N A Ringer sensitivity Ringer sensitivity RS for 2 3 wire CPE Limit 0 lt RS lt 5 Ringer minimum operate voltage Limit gt 30 Vp p Does ringer respond to ringing of 40 ms duration If Yes is there a warning notice in the User Instructions Is there bell tinkle from parallel connected device If Yes is there a warning notice in the User Instructions Ringer loading Ringer loading RL for 2 3 wire CPE Limit 0 lt RL lt 5 Ringing number RN for 2 3 wire CPE Ringing number RN shall be the highest value of RS or RL as in 7 5 2 or 7 5 3 Limit 0 5 lt RN lt 5 Is the device intended for stand alone connection and not in parallel with other CPE Yes No If Yes is statement in User Instructions Series connected devices General requirements as for 7 5 1 PTC 200 May 2006 Yes No NA Yes No NA Yes No Yes No Yes No Yes No Yes No Yes No 7 7 2 Sa Sb 7 7 3 7 7 4 1 142 Series connected device without a terminating facility Ringing Load Lrn supported at terminal equipment port Limit gt 4 Ringer loading
167. rivation of echo loss given in ITU T Rec G 122 1993 Annex B 4 is used Facsimile is a system for transmitting and receiving text and images For the purposes of this Specification the medium over which the image information is carried is the Telecom Public Switched Telephone Network Full current is the current drawn by any item of terminal equipment when connected directly to a 50 V 400 ohms source in the off hook condition e Full current is used for test purposes and defines the maximum current that can be drawn under zero length line conditions e On some exchanges operated by Telecom the line current limits at 80 mA maximum Handover is the process of transferring a call which is in progress from one item of terminal equipment to another while maintaining the connection Handset is a rigid combination of telephone microphone and telephone receiver in a form convenient for holding simultaneously to mouth and ear respectively e The geometric relationships between the receiver and microphone positions for optimum transmission performance are given in ITU T Recommendation P 35 1988 Handsfree facility is the provision of a loudspeaker and amplifier within the telephone such that calls may be established without lifting the handset 28 PTC 200 May 2006 e Call progress can be monitored and the handset only needs to be picked up for actual conversation when the called party answers This facility should not be co
168. rminal equipment concerned e Such equipment will often be automatic calling or answering devices e See also Naive user Insertion loss is the ratio of the loss or gain through a network when a device is connected to that when the same device is not connected normally expressed in dB Inter digital pause is the interval between successive DTMF tone bursts in a series of digits Key Telephone System KTS See definition of PABX Type 2 Last number re dial LNR or LND is the process of sending DTMF signals They are manually dialled and stored in the sending device during the previous call attempt to establish a connection Line grabbing is the facility wnereby an item of equipment whether under manual or automatic control may disconnect any other terminal equipment from its line and seize that same line to either terminate or initiate a call Loop current is the standing d c current drawn by any equipment in the off hook condition e The loop current is dependent upon the resistance of the equipment the line length and any current 29 PTC 200 May 2006 limiting by the feed voltage Loudness Rating LR is a measure expressed in decibels for characterising the loudness performance of complete telephone connections or parts thereof such as the sending system line or receiving system e Reference ITU T Recommendations P 64 1993 and P 65 1993 and also ITU Recommendation P 76 1988 e Loudness rating
169. rmula 10 14 RLR 0 175 logig gt 10 9 0175 Sjen Len WRn n 1 where Wen is the receive weighting factor given in Table 1 Len is the real ear loss given in Table 1 in dB Sjen is the receive sensitivity of the line test circuit in dBPaj v 115 PTC 200 May 2006 TABLE 1 PARAMETERS REQUIRED TO CALCULATE SLR STMR AND RLR n fn LEn WRn Wsn Wun HZ dB dB dB dB 1 200 8 4 85 0 76 9 86 4 2 250 4 9 74 7 62 6 81 9 3 315 1 0 79 0 62 0 78 5 4 400 0 7 63 7 44 7 78 2 5 500 2 2 73 5 53 1 72 8 6 630 2 6 69 1 48 5 67 6 7 800 3 2 68 0 47 6 58 4 8 1000 2 3 68 7 50 1 49 7 9 1250 1 2 75 1 59 1 48 0 10 1600 0 1 70 4 56 7 48 7 11 2000 3 6 81 4 72 2 50 7 12 2500 7 4 76 5 72 6 49 8 13 3150 6 7 93 3 89 2 48 4 14 4000 8 8 113 8 117 0 49 2 NOTE Values fort are taken from BS 3593 1963 4 11 3 Sidetone Masking Rating STMR The telephony device is connected to the test equipment as shown in Fig A1 with RL set at a value of 600 Q resistive a line length of 0 km The test is performed with line currents of 20 mA 45 mA and full current or 80 mA The test is then repeated with H set at BT3 For each of the 14 frequencies fn the sidetone loss of the line test circuit is determined by a procedure consistent with that described in ITU T Rec P 64 1993 a The sidetone loss LmesTn is calculated from the formula Luestn 20 logio Pmn Pen where Dan is the free field sound pressure at the mouth referen
170. s 4 Analogue CLI equipment which is compatible with the recommendations of Bellcore Special Report SR TSV 002476 Issue 1 December 1992 is likely to satisfy the requirements of this Specification There are some differences which should be noted and these are stated where appropriate e The Telecom on hook data transmission and associated analogue CLI requirements are based on the Bellcore system However to call back the number passed forward from the network digit insertion or deletion is necessary This impacts on the design of any devices which provide a dial back feature 92 PTC 200 May 2006 25 Hz 80 ringing generator Transmit level 13 dBm MODEM Bell 202 Artificial line 0 3 amp 6km Ringing Detector RN 5 Sg serial port 8 bits data 1 stop bit CSS Stat DO D1 D2 D3 D4 DS D6 D Stop Start Do D7 DU 01010101 5 5 hex 55 Notes Checksum 2 s complement of the modulo 256 sum of all words from the message type onwards Modulo 256 sum exclusive OR of each word 2 s complement X 00 X FIG 11 2 TEST SET UP FOR ANALOGUE CALLING LINE IDENTIFICATION EQUIPMENT 11 1 2 On hook impedance 1 During the reception of data the receiver of an on hook device may for the purpose of improving impedance matching terminate the line with a more suitable a c impedance e g BT3 than that stated in clause 4 5 2 In this case the following shall apply a
171. s initiated 2 All battery powered equipment shall fail safe and not cause any harm to the Telecom network under the following conditions a If the life of its batteries is approaching a critical point b If the battery voltage falls for any reason to that level which could cause the device to malfunction 3 If under any power failure conditions the basic telephony functions of any device are lost then the following warning notice shall be included in the user instructions IMPORTANT NOTICE Under power failure conditions this telephone may not operate Please ensure that a separate telephone not dependent on local power is available for emergency use 6 11 2 Additional requirements for series connected equipment 1 Other than on 4 wire devices for which fail safe arrangements are difficult to achieve every possible step shall be taken to maintain basic telephone service when a failure of series connected equipment occurs To this end the fail safe mechanisms stated in the following sub clauses shall be provided 2 Multiple port devices see Fig 6 3 a In the event of a power failure the line port shall be directly connected within 5 seconds to at least one of the terminal equipment ports The port or ports shall be clearly marked and shall also be clearly indicated in the User Manual b In the event of a logic or component failure the device shall be designed to fail to a predetermined state wit
172. s of dBmp using psophometric weighting in accordance with CCITT Blue Book Rec O 41 Tests shall be carried out at full current or 80 mA 4 3 1 Equipment on hook 1 The noise level is measured by averaging over a minimum period of 1 second The measurement is made three times and the highest value of the three measurements is selected as a determination of the noise level 2 For noise signals above 4 kHz a spectrum analyser with the capability of measuring frequencies up to at least 150 kHz shall be used connected as above The analyser shall be set up to average no less than 50 samples 4 3 2 Equipment off hook For all noise tests with the equipment off hook the test set up is as above but with the microphone of any telephony device replaced by a resistor of value equivalent to the resistance of the microphone at 1000 Hz 1 a Noise signals in the 300 Hz 4000 Hz range shall be measured as in clause 4 3 1 1 above b Signal to noise ratio should be tested at 1000 Hz Where the record level is adjustable the input test signal will be adjusted so that the associated VU meter indicates 0 dB e It is assumed that any equipment having automatically controlled recording levels will be already set to this level d Noise signals above 4 kHz shall be measured as in clause 4 3 1 2 above 2 Signal to noise ratio should be tested using a signal of 1000 Hz set at a level equivalent to the lowest transmit level of any s
173. s permitted to cause a nuisance to other users of the network However users may not realize that the incorrect application of automatic calling equipment could give rise to such problems e A typical example of such nuisance calls is repeated attempts to make unsolicited sales offers to the same number or group of numbers such as when a block of numbers terminate on the same PABX 8 1 8 Call logging All automatic calling equipment which incorporates call logging facilities shall comply with one of the following a It is preferred that all calls which are answered should be logged regardless of whether they are successful or not If not then b if the equipment logs only calls which result in successful machine to machine handshake the User Instructions shall contain the following warning The call log incorporated in this equipment does not record all answered calls The call log therefore may not agree with the Telecom account which may include calls not shown on the log s This ensures that either a all calls from the calling equipment which are successfully switched through the Telecom Network may be reconciled with the Telecom billing record For example a facsimile call to a wrong number in an overseas country with several retries could run up a significant Telecom bill Even though the calls were actually answered this bill could not be reconciled with the facsimile machine record if the individual call attempts wer
174. se 10 2 or ii Provided with a suitable BT plug ended connecting cord adapter to permit plug connection in those cases where the basic design was originally fitted with screw or IDC terminations b The plug ended cord supplied with a ringer should be no longer than 3 metres in length c The design of existing ringers which have already been granted Telepermits should preferably also be converted to plug connection at the earliest opportunity e Telecom s aim is for all customer equipment to be plug connected so that customers have the opportunity to relocate their terminal equipment as and when necessary This also provides the benefit that suspect equipment can be removed for fault investigation without the need for a service call 71 PTC 200 May 2006 4 Ringers for exterior use See clause 7 3 below 7 3 Externally mounted devices All new equipment intended for mounting outside buildings or other weatherproof enclosures i e all weather resistant devices shall incorporate the following a 2 wire connection with a capacitor of nominal value not greater than 1 UF in series with the detector ref Section 10 b Screw or IDC terminals c Weather resistant cable access 7 4 Audible characteristics 1 The sound level for audible operation of a ringing detector if provided shall be at least 50 dBA when measured at 1 metre from the ringer in any direction while it is mounted on a hard surface s It is recommen
175. se 2 12 for general information on series connected devices e See also clause 4 1 2 for series connected devices with proprietary interfaces 4 6 1 Terminating devices 1 For series connected terminating devices including those containing a 4 wire element see Fig 4 5 the PSTN line port shall be as specified in clause 4 5 1 2 and 3 above with a reference BT3 network connected to the terminal equipment port 2 If the terminal equipment port of a series connected terminating device is 2 wire and provides a separately powered line feed to other terminal devices the port impedance shall be nominally BT3 and shall satisfy the requirements of clause 4 5 1 above 4 6 2 Non terminating devices For a non terminating series connected device designed for connection between the line and a separate terminal device the return loss requirements are as follows a The return loss at the line port of the series device shall be measured against BT3 for line currents of 20 mA and 80 mA with the terminal equipment port terminated in a reference BT3 impedance see Figs 4 4 and 4 5 e Ifthe series device is dependent upon the d c line feed for it s operation to test the return loss it may 43 PTC 200 May 2006 be necessary to also provide a d c termination with the BT3 a c impedance b The return loss measured shall be no less than 25 dB at any frequency in the band 300 3400 Hz Teminal equipment port Line PSTH por
176. should be capable of being initiated within 150 ms of carrier loss e The 150 ms is short enough to be well within the minimum off period of any exchange generated tone and long enough for carrier detect circuitry to detect loss of carrier 3 For automatic answering devices which have a switching function performed after the call is initially answered the call shall be released if the dependent terminal equipment does not go off hook within 60 seconds of the call being initially answered e This restricts the total call length so that the calling party is not billed for more than 1 minute for what is essentially an ineffective call 4 Automatic answering devices having no supervisory capability shall automatically release calls within 2 minutes of going off hook 8 5 Recording functions 1 There are legal considerations relating to the use of listening devices designed to record telephone conversations Section 216 of the Crimes Act 1962 which includes a definition of such devices makes it an offence to intentionally intercept a private communication by means of a listening device unless one of the permitted exceptions applies One of these is that at least one party to the conversation must be aware that the conversation is being recorded e This clause does not relate to a simple answering machine or voice messaging system which records a message from a caller and is not capable of recording a both way conversation The caller is
177. sistor b a 1600 Ohms resistor in series with a 510 nF capacitor 3 The requirement of sub clause 2 above applies to all telephony devices including those fitted with a receive volume control when adjusted to both minimum and maximum settings e Instability not only affects the user but will also upset the other person taking part in the conversation e The network described in paragraph 4 12 2 b copies the effect of an additional telephone attached to the same line being taken off hook during a telephonic conversation All telephone appliances must remain stable under the combined impedance of two parallel off hook telephones 4 13 Acoustic shock protection The sound pressure at the earpiece of telephony products shall not exceed the following limits when a 1000 Hz sinusoidal signal of up to 24 dBV 15 85 V is applied via a 600 Ohms resistor to the line terminals The equipment shall comply at all line currents between 20 mA and 80 mA and all signal generator voltages up to 24 dBV a For handsets max 118 dBA approximately equivalent to 24 dBPa b For headsets max 111 dBA e This requirement relates to the safety of the user and reduces the risk of line transients resulting in injury to the user s hearing 4 14 Adjustable volume controls on telephony devices 1 The requirements of clauses 4 2 to 4 13 shall be tested at both the minimum and maximum settings of all telephony products equipped with a receive
178. stantial complaints from customers 4 If during such a re assessment it is suitably established that the transmitted 51 PTC 200 May 2006 speech quality is unintelligible to another party when connected via the Telecom PSTN then either a the speech quality shall be improved to the satisfaction of Telecom or b the Telepermit will be cancelled 5 The cost of such re assessment shall be born by the Telepermit holder Also any cost incurred by Telecom for investigation of complaints by customers relating to transmitted speech quality may be passed on to the customer using the transmitting device 52 PTC 200 May 2006 5 SIGNALLING REQUIREMENTS 5 1 Signalling types 1 The standard method of signalling between customer premises equipment and Telecom telephone exchanges is dual tone multi frequency DTMF signalling This method is also widely used for signalling from customer to customer after a call has been established 2 The Telecom network has traditionally supported reverse decadic pulse signalling This dialling method will not be supported by the Next Generation Network NGN so Telecom s support for this signalling method has been withdrawn and CPE using only decadic pulse signalling will not be Telepermitted 3 Where CPE has the option of decadic signalling either The option shall be disabled or If selected by a user accessible switch a warning not to use the decadic or pulse setting shall be aff
179. stic output for acceptance is set very low at only 50 dBA This may be assessed subjectively and it need only be measured where there is doubt whether this level is met 7 5 1 General operation Reliable operation is described as follows a Devices with audible ringers The ringer under test is required to follow the ringing cadence reliably by ringing audibly and cleanly with no hesitation or stuttering Electronic ringers often take longer to start with decreasing voltage and this has the effect of shortening the ringing bursts within the cadence Where there is a discernible shortening by more than 5 of the ring burst when one extra load is load is switched in then the sensitivity shall be calculated with that load switched out b Auto Answer ringers Reliable operation for an automatic answer device is determined by the equipment answering on application of ringing in the expected number of cadences The test shall be repeated five times with the ring bursts lengthened and shortened by 40 ms see figure A5 and the equipment shall answer each time FIG A5 CADENCE TOLERANCE 7 5 2 Ringer sensitivity 1 a The test set up for ringer sensitivity is shown in Fig A6 The set up shall be calibrated as follows i Close switches Sw1 to Sw10 ii Adjust the variable resistor until V4 107 Vp Itis important that this V is a true peak to peak measurement and not calculated from an r m s measur
180. structions explain Dialling procedures adequately Impact of non code access Warning notice about local call charges Provided Yes No Keypad layout International standard layout Complies Yes No If No state details of layout DC CHARACTERISTICS Function of D C line feed Is the device polarity dependent Limit Yes No OFF Hook d c line characteristics The d c Voltage at various currents shall not exceed the upper mask d c Voltage at 15 mA Limit SOV d c Voltage at 20 mA Limit SOV d c Voltage at 45 mA Limit S lt 20V d c Voltage at max current Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No PTC 200 May 2006 6 5 Gab 137 Is the d c Voltage at any current below the lower mask Limit Yes No If the answer to the above is YES is the hand over warning notice provided Limit Yes No All devices shall fully operate down to 20 mA Limit Yes No Supervisory conditions Line seizure should be initiated by going OFF Hook and drawing d c current Complies Yes or No Ring trip shall be initiated upon answering an incoming call by going OFF Hook and drawing d c current Complies Yes or No Call release shall be initiated by going ON Hook and breaking the line current Complies Yes or No Does the device comply with the mandatory requirements of 6 3 Complies Yes or No In case of
181. t complies YES or NO Speech circuit suppression during DTMF keying Limit gt 30 dB DTMF Receivers DTMF receiver signal level range Minimum level Limit lt 30dBm Maximum level Limit 2 5dBm DTMF receiver frequency tolerance Limit 3 of nominal Yes No DTMF receiver timing recognition Limit at least 40 ms Yes No Automatic Dialling Devices General requirements Automatic dialling feature without pre recorded message Shall only be activated manually Limit complies YES NO No more than 10 calls to same number for each manual operation Limit complies YES NO Yes No Yes No Yes No Yes No PTC 200 May 2006 2b 5 5 5 5 6 5 6 1 1 3 6 0 6 2 3 4 6 3 136 No less than 30 secs between call attempts Limit complies YES NO Warning notice prohibiting automatic voice calls to 111 Limit complies YES NO Facility provided to reprogramme called numbers Limit complies YES NO Caller display equipment Adjunct caller display unit wiithout associated keypad Is digit O inserted on numbers of 8 9 digits received from the network Are no digits inserted on numbers of 7 digits or less Manual insertion of digits Warning notice for adjunct automatic dialling unit which requires associated telephone for inserting dialling prefixes Provided Yes No User Instructions Are clear user instructions provided Do user in
182. t Line Teminal device Series connected device FIG 4 4 2 WIRE SERIES CONNECTED DEVICE Teminal equipment port Tenn inal device Seres connected devez FIG 4 5 4 WIRE SERIES CONNECTED DEVICE 4 7 Impedance of bridging equipment See clause 4 5 2 4 8 Impedance balance ratio to earth 1 Devices which have a direct or indirect connection to earth shall for both on hook and off hook conditions have an impedance balance ratio to earth of not less than 40 dB over the frequency range 200 4000 Hz when tested as shown in Fig 4 6 2 For voice type equipment it is strongly recommended that in the off hook condition devices should also have an impedance balance ratio to earth of not less than 60 dB over the frequency range 200 1000 Hz 3 Equipment connected directly or indirectly to mains power supplies shall also comply with the requirements of this clause e ELV plug packs will provide some capacitive coupling between earth and the ELV output leads so may affect impedance balance to earth in some cases Equipment shall therefore be tested while connected to a power supply of the type supplied to customers A4 PTC 200 May 2006 Only used for Say ire devices gt 470 pF NOTES 1 Resistors R to be matched to within 0 1 2 Capacitors C to be matched to within 10 3 Power earth amp signal earth shall be connected together for duration of test 4 Balance Ratio to Earth 20 logy V1 V2 dB
183. t on the receiver e Although not planned at present there is always the possibility that Telecom may at some future date increase the data capacity by shortening the 500 ms and 200 ms gaps before and after data is transmitted see Fig 11 3 and also the message preamble 250 ms CSS and 180 ms mark Any equipment not dependent on the timing of these signals would remain compatible should such changes be implemented 3 On hook data transmission receivers shall be compatible with the requirements of Section 7 of this Specification 4 It is strongly recommended that on hook data transmission equipment should always look for data and not uses ringing as a wake up signal e This will allow the device to be compatible with future services such as message waiting indication which use on hook data transmission not associated with ringing e Any device which looks for data at all times and does not terminate the line should not experience any difficulties with the Telecom New Zealand ringing cadences DA1 DA4 e Any device which uses ringing as a wake up signal for data reception or to switch in an a c terminating impedance during data transmission is likely to experience difficulties with the ringing cadences particularly DA4 11 1 4 Data capture 1 The receivers of all devices which use on hook data transmission shall be capable of receiving data in the format described in Technical Document TNA 102 Section 10 Both sin
184. tance of the microphone at 1000 Hz Measurements shall be made at both 20 mA and full current or 80 mA on a 0 km line b The test signals shall be of the standard frequencies 300 to 3400 Hz in 100 Hz increments preferably at a level of 10 dBV Tests made with closer frequency separation are acceptable provided that the full range is covered e The test signal level of 10 dBV may not always be achievable on all test instruments and is therefore only stated as a preference to Test Laboratories 6 For devices equipped with a hold facility echo return loss will be measured as above but with the device on hook and the hold condition activated 4 5 2 On hook impedance The on hook impedance shall be measured at the line terminals with the device in the on hook condition and connected to a high impedance 50 V d c feed ref Fig A1 via a 0 km line Measurements shall be made by applying 1 Vrms over the frequency range 300 Hz to 3400 Hz at 200 Hz intervals using a known source impedance The required impedance magnitude at each frequency is calculated from the voltages across the known source impedance and impedance of the device 112 PTC 200 May 2006 4 6 1 Terminating devices 1 amp 2 The line port impedance of terminating series connected devices shall be tested as in clause 4 5 1 above with the terminal equipment port terminated with a reference BT3 network 4 6 2 Non terminating devices As for terminating dev
185. telephone as part of an initialisation process Ohms d If a security code can be lost for any reason then regeneration of a code shall also be on a random basis A security code shall not under any circumstances be allocated by means of a default code list for that particular make and model 86 PTC 200 May 2006 e Typically security codes may be lost in some models if the battery is removed or left discharged for a prolonged period e The applicant shall describe how the security codes used are transferred between portable and base units to ensure security from unauthorised handsets f Preferably if the handset of a simple cordless phone is in place on its associated base unit the PSTN line should not be accessible from another handset via the radio path e This does not apply in cases where a base unit is designed to cope with more than one portable unit as in systems using processes such as CT2 and CT3 g The following shall apply to all originated calls I The security code shall be automatically transmitted by the portable unit ii The base unit shall seize the PSTN line only after the pre determined security code is received h On incoming calls only the portable unit with the predetermined security code should ring regardless of other portable units being within radio range of the base unit 87 PTC 200 May 2006 10 NETWORK CONNECTION 10 1 Telecom standard 1 The preferred method of connection t
186. ternal device e g a computer and time can be wasted attempting to set up or initialise a device before tests can be carried out e Equipment that complies only under non operational conditions is not acceptable for the grant of a Telepermit 6 The testing of any product shall include simple functional tests to ensure the following a The equipment is operational to the extent that calls can be initiated answered and terminated reliably as appropriate to the product concerned b The equipment is operational over a typical range of line conditions c The basic functions of the equipment are demonstrated 7 Any functional limitations revealed by these tests shall be covered by an appropriate warning notice see 1 11 and Section 13 in the user instructions for the product e Typical examples of functional limitations are 33 6 and 56 kbit s modems both of which are likely to be restricted to lower bit rates when connected to some PSTN implementations It is important that customers are aware of such limitations if the supplier is to avoid breaching the Customer Guarantees Act Telecom gives no guarantee that such devices will operate over the PSTN at their maximum design speed see also clause 4 9 3 2 11 2 Test results 1 Full test results in the form of a Test Report issued by the Testing Authority which should include colour photographs shall be provided in support of all Telepermit Applications 2 Such Test Reports
187. test criteria in the light of actual service experience e Such an amendment would not necessarily affect the stated requirements of this Specification Normally only the testing requirements of Appendix 3 would be affected 1 10 Non compliance aspects All applicants for Telepermits covered by this Specification shall investigate those 14 PTC 200 May 2006 areas indicated by the Testing Authority as being non compliant The Telepermit application shall incorporate either a evidence that the product has been suitably modified to fully comply with this Specification together with an explanation of the arrangements made to ensure that these modifications will be carried out on all future production units or b an explanation giving justification for non compliance together with a statement of the applicant s intentions regarding the product s future compliance 1 11 Warning notices 1 There are many instances where the applicant is required to insert a warning notice in the User Manual for the product This usually applies when devices are not fully compliant with recommendations or provide features which are not supported by the Telecom network In such cases the grant of a Telepermit is conditional on the warning notices being inserted The Telepermit holder shall ensure that all such warnings are included in the relevant product user manual and brought to the attention of any prospective purchaser or user e For convenience
188. than 30 seconds between the end of one attempt and the beginning of the next attempt 8 1 4 Automatic calls to different numbers 1 Automatic calling equipment programmed to make a series of calls to different numbers shall go on hook for a period of not less than 2 seconds between the end of one call attempt and the beginning of the next 2 For any automatic calling device where the requirements of 1 above are determined by other equipment e g software in a PC then the following warning notice shall be incorporated in the User Manual Some parameters required for compliance with Telecom s Telepermit requirements are dependent on the equipment PC associated with this device In order to operate within the limits for compliance with Telecom s Specifications the associated equipment shall be set to ensure that automatic calls to different numbers are spaced such that there is no less than 5 seconds between the end of one call attempt and the beginning of another e See also clause 8 1 2 8 1 5 Termination of failed call attempts 1 For any call which is not answered within 90 seconds of the transmission of the last digit of the called party s number the equipment shall terminate that call and restore to the on hook state 2 It is recommended that such equipment terminate any such call within 30 seconds of receipt of busy tone number unobtainable tone or disconnect tone 8 1 6 Call identification phase 1 If a
189. the directory number b Minimum number capacity of 15 digits which allows for full international numbers to be displayed without prefix For the display to include the 00 international prefix then 17 digits is recommended c If fewer than the recommended number digits are displayed the display should right justify the full number so that the full local number will always be displayed In such cases it is preferable that the display has a scroll capability so that all digits can be viewed e Confusion can arise where displays do not show all digits of a number For example a 10 digit display might show 12 2283 6789 which could be a number in Sydney Australia with the first digit 6 of the country code not displayed Alternatively it could be a number in Cardiff Wales with the country code 44 not displayed or a number in some other country for which one or more leading digits are not displayed d Minimum capacity for name information 20 characters e Name information will not be available on early implementations of the Caller Display service and may not be present at all in some circumstances e Note that this field is simply alpha numeric text and could be used for displaying more general messages el Cause of absence of display i e Out of Area O or Anonymous P It is recommended that the complete IA5 ASCII character set for this field is decoded 5 The maximum number of digits that
190. the provision of a loudspeaker and amplifier for incoming signals such that call progress can be monitored Mute the temporary suppression of any speech transmission facility provided by an item of terminal equipment e Mute is used for security or confidentiality purposes and to enhance received speech perception in noisy ambient conditions Naive user is a person with no special knowledge of the characteristics of a particular complex system and having no specialised equipment that may be necessary to deal with a call from such systems e This concept is particularly applicable to equipment which has automatic calling or answering facilities s The concept of a naive caller is dealt with in British Standard BS 6789 and the definition has been amended for New Zealand applications to cover anyone who is not privy to the special requirements of an automatic system A system can thus have special characteristics in order to provide some degree of security against unauthorised users or those who are accidentally connected to the system e Application of the naive user concept provides for particular Telepermit grant conditions to be negotiated in some special circumstances especially where professional equipment is involved or where there is some need for additional security Noise is any unwanted electrical energy which can be measured psophometrically at the output of a device or line e See also definition of Psophometric e For
191. tion the d c voltage versus current characteristics in the off hook condition shall be no greater than the upper limit curve shown in Fig 6 1 This curve is formed by straight lines joining the following coordinates UPPER LIMIT CURVE CURRENT mA 0 20 60 61 PTC 200 May 2006 VOLTAGE Volts 9 9 27 2 In order to improve the chances of call handover where applicable the off hook d c characteristics should also not be less than the lower limit of the curve shown in Fig 6 1 This curve is formed by straight lines joining the following coordinates CURRENT mA 10 20 100 LOWER LIMIT CURVE VOLTAGE Volts 0 6 10 e Although not mandatory this requirement is strongly recommended for all devices with the possible exception of facsimile equipment and data modems where handover is unlikely to occur 20 7 s 60 27 20 Pender o He stichor D x Es NN EE SN Not Recommended dE 0 10 20 20 40 50 pU 70 an er Current nm FIG 6 1 LIMITS OF D C CHARACTERISTICS 3 For voice equipment with d c characteristics that lie beneath the lower limit curve shown in Fig 6 1 the user instructions shall contain a warning as follows This equipment may not provide for the effective hand over of a call to another device connected to the same line 4 All products shall be capable of full operation down to a line current of 20 mA e Satisfactory operation at line currents down to 18 mA is
192. tions e Telepermits will be granted under the PTC 2xx series categories shown in the above table and used since 1988 even though this Specification replaces the individual Specifications that were originally used This makes it easier to identify the functional grouping of products 4 For some types of equipment it is necessary to refer to other Specifications or standards in addition to this Specification as indicated below In each case the documents referred to shall be read in conjunction with this Specification a For all equipment which intentionally uses radio frequencies the applicable standards are defined by the Radio Spectrum Management Group of the Ministry of Economic Development Frequency allocations and a list of the applicable standards are published on line at www med govt nz rsm b For all devices with payphone facilities Specification PTC 213 shall be read in conjunction with this Specification 5 For PABXs and any device designed for use in conjunction with PABXs particularly when such a device is system dependent then this Specification shall be read in conjunction with Specifications PTC 107 9 or PTC 220 as applicable e Many PABXs and Key Telephone Systems provide extension ports designed for use with PSTN devices compliant with this Specification However compliance with the requirements of this Specification is no guarantee that a device will work satisfactorily with all PABXs and Key Telepho
193. tone have a marked effect not only on the perception of received signals but also on the volume of the speaker s voice Thus excessive sidetone in one telephone can have a marked effect on the received speech volume of the telephone at the other end of a call 3 A high level of sidetone also has a significant effect on the use of telephones in high ambient noise conditions making received speech extremely difficult to understand e Sidetone is related to SLR and RLR and any attempt to change them for telephones to achieve compliance with loudness rating requirements can also have a marked effect on sidetone performance e Reference ITU T Recommendations G 121 1993 and P 79 1993 and also ITU T Recommendation P 76 4 11 2 Optimum sidetone performance 1 The internationally recognised method for assessing sidetone is by use of sidetone masking rating STMR The preferred range of STMR for a telephone on a complete call connection is 7 12 dB e Reference ITU T Recommendation G 121 1993 2 For optimum sidetone performance in the Telecom network with the objective of being within the preferred range stated in 1 above the equivalent sidetone balance impedance of a telephone Zs0 should be close to the line terminating impedance BT3 ref Fig 4 3 e Accurate determination of STMR of a telephone for all types of complete connections is totally impractical due to the number of variables involved However assessment of ST
194. trex group e See also clause 11 4 5 for further information on number formats 2 There are three possible ways to avoid the problem described in 1 above and one of them should be employed on adjunct caller display units The possibilities are as follows a Dispense with the dial back feature totally b Provide for digit insertion in accordance with sub clause 5 below c Incorporate a keypad for manual insertion of digits 3 Telecom pre sets each line in the local exchange to either normally display or normally withhold the calling number as determined by the customer concerned It should be noted that callers who may or may not be the actual customer may wish to control the display of their numbers on a call by call basis as follows a To withhold a normally displayed calling number dial the prefix 0197 b To display a normally withheld calling number dial the prefix 0196 4 Where dialling such prefixes involves the use of an associated CPE device potential problems may arise as explained in clause 5 5 4 5 Where a dial back feature is provided on an adjunct caller display unit and there is no associated keypad on the unit a The digit 0 shall be inserted as the first digit where the number received from the network comprises 8 9 or 10 digits e Local and national calls are indicated by a number length of 8 9 or 10 digits b No digits shall be inserted where the nu
195. ts and as such are not pre requisites for the grant of a Telepermit However compliance is required by law This includes the appropriate C tick labelling of all products introduced to the Australian and New Zealand markets since 1 May 2003 and the need for importers to hold a Supplier Code Number e New Zealand requirements for EMC are now closely aligned with those of Australia under the Trans Tasman electromagnetic compatibility EMC regulatory arrangements These EMC arrangements have the same legal standing in both Australia and New Zealand and compliance in one country is recognised in the other 1 2 2 Immunity from radiated energy Although compliance is not mandated by the Ministry of Economic Development it is strongly recommended that all devices satisfy the requirements for immunity to radiated electromagnetic energy as stated in the relevant joint Australian and New Zealand standard such as AS NZS 4252 e The acceptable equivalent European standard is CENELEC CEN 50082 1 1992 1 3 Legal requirements Section 106 of the Telecommunications Act 2001 requires that nothing shall be connected to a telecommunications network without the agreement of the network operator For connection to the Telecom network any device shall comply with Telecom s PTC specifications and display a label as evidence that a Telepermit has been granted e The display of a Telepermit label clearly indicates to customers that the device may lawful
196. uency range 100 Hz to 5 kHz c For non voice devices the presence of unwanted signals in the frequency range 0 4 kHz is regarded as a marketing feature d For all devices the noise requirements at frequencies above 4 kHz shall be as stated for the on hook state in clause 4 3 1 2 above 2 During signalling call set up phase for all devices a The individual power level of any extraneous frequency in the range 300 Hz to 5 40 PTC 200 May 2006 kHz during signalling shall be at least 20 dB below that of the signalling frequency with the lowest level b The one minute mean power level in any 3 KHz bandwidth contained wholly above 5 kHz shall be at least 20 dB below that of the signalling frequency with the lowest level e Noise includes any unwanted signals such as distortion and intermodulation products that may occur during call set up signalling 4 3 3 Multi line devices Any device having direct access to more than one line shall have a minimum of 50 dB crosstalk isolation between individual lines over the frequency range 300 3400 Hz This shall apply to both on hook and off hook conditions e This requirement applies mainly to devices such as two line telephones and some simple key systems Requirements for products such as PABXs are covered separately in Specification PTC 109 4 4 Distortion 1 Send harmonic distortion a The total send harmonic distortion of any telephony device should not exceed 5
197. uent Sections of this Specification These functions are summarised as follows e Signalling between the PSTN and PABXs is regarded as a special case for the purposes of this clause since it is more complex than the following indicates ref Specifications PTC 107 108 and 109 a D C loop unidirectional CPE to PSTN ref clause 6 4 1 and 2 b Ringing unidirectional PSTN to CPE ref clause 7 7 c DTMF signalling unidirectional CPE to PSTN ref Section 5 d Voice frequency transmission primarily bi directional between CPE and PSTN ref Section 4 and also clause 11 4 e Clause 11 4 describes requirements for caller identification which is a unidirectional PSTN to CPE function However caller ID uses the on hook data facility which has bi directional capability and is described in Technical Document TNA 102 Section 10 2 There are three basic functional categories of equipment described in the following clauses These categories are dependent on various combinations of the above signalling functions and how they are used Some equipment will fall into more than one category and may change categories for some of the above functions at different stages of a call 3 All of the functional categories available on equipment shall be fully tested e See also clause 2 4 5 which calls for list of functions as a mandatory requirement for all Telepermit applications 2 12 2 Terminating function Devices with a terminat
198. uipment of a different make or model nor does it imply that any product is compatible with all of Telecom s network services 10 PTC 200 May 2006 1 SCOPE 1 1 Equipment types and associated Specifications 1 This Specification covers the technical requirements for devices intended for connection to the Telecom analogue Public Switched Telephone Network PSTN This includes analogue Centrex devices References are made to Technical Document TNA 102 which describes conditions applicable to all PSTN analogue lines PTC 200 and TNA 102 complement one another 2 This 2004 edition incorporates all changes announced in the Access Standards Newsletters since the publication of the 1996 edition 3 The requirements of this Specification cover the following types of equipment Type of device Category Telephony devices including those with monitoring or loud speaking PTC 202 facilities Cordless telephony devices see also sub clause 4 below PTC 206 Small PABXs KTS see also sub clause 5 below PTC 207 Headsets and handsets when marketed individually PTC 208 Miscellaneous and series connected devices PTC 210 Non voice devices fax machines modems etc PTC 211 Voice auto answering calling amp recording devices answering PTC 212 machines etc Payphones see also sub clause 4 below PTC 213 Conference terminals excluding conference bridges PTC 216 Other devices which incorporate one or more of the above as appropriate func
199. uld a Telecom customer also be the customer of a toll by pass carrier and subscribe to Telecom s non code access service local calls preceded by the 0 and area code will be passed to the other carrier see clause 5 5 3 e Such customers will need to choose whether or not the use of an automatic dial back feature is justified In some cases such units will be unacceptable 8 Where automatic calling devices are under centralised control so that large numbers of them can call the same PSTN number or group of numbers at the same time the user must negotiate the number of redial attempts and the delays between attempts with the Telecom service concerned e The circumstances of automatic calling are varied and the aim is to assess the specific calling conditions for each customer and negotiate precautions where required 56 PTC 200 May 2006 5 5 2 Caller display equipment 1 Caller display devices which offer a dial back facility represent a potential difficulty for users The number forwarded from the network comprises only the area code and the local number with no leading 0 Wrong numbers will result in MOST cases when such devices dial only the number received e Without the 0 prefix the area code is seen by the exchange as the first digit of a local number The last digit of the true local number is then ignored The only case for which the correct number is shown and dialled is where the device is used within a Cen
200. umber of product returns or claims by purchasers who make use of Telecom s non code access service 5 6 Keypad layout 5 6 1 International standard layout 1 The standard requirement for keypads is that they be alpha numeric The layout agreed internationally at the World Telecommunications Standardisation Conference March 1993 has been adopted by Telecom in New Zealand The layout is as shown below in sub clause 2 and the date for implementation was 1 April 1996 e This new standard is published in the following standard documents 1 ITU T Recommendation E 161 2 International Standard ISO IEC 9995 8 1994 3 ACA TS 002 1996 e ANSI and ETSI publications also include the same standard 2 The internationally agreed standard alpha numeric keypad layout is as follows ABC DEF 1 2 3 GHI JKL MNO 4 5 6 PQRS TUV WXYZ 7 8 9 z 0 3 For equipment which does not comply with this standard layout details of the actual layout shall be stated in the application or in an associated test report e It is strongly recommended that all products marketed comply with the layout in sub clause 2 above Failure to do so will inevitably cause confusion to callers Alpha numeric word numbers are very popular particularly for customers with 0800 or 0900 numbers e At some future date the alpha numeric layout shown in sub clause 2 above may become mandatory If so from that time no Telepermit applications will be acce
201. und cables Cables have increasing loss with increasing frequency 15 SS z000 4000 10 a up 05 Up per limit 5 K S 1000 3 200 0 1000 2000 3 S000 0 Low er limit dB Relative Arbitrary Levels dn G 100 200 300 400 500 1000 2000 2000 S000 Frequency Hz 22 FIG 4 7 SEND FREQUENCY RESPONSE OF TELEPHONY DEVICES 3 The send frequency response shall be measured 4 9 2 Receive frequency response of telephony devices 1 The receive frequency response of telephony devices connected to a zero length line with the line current set at 20 mA should be within the limits specified below and shown in Fig 4 8 2 The coordinates of the receive frequency response mask relative to the mid point of the mask at 1 kHz are as follows Frequency Lower Limit Upper Limit Hz dB dB 100 10 200 4 300 20 25 4 500 4 4 1000 4 4 2000 4 4 3000 12 25 4 4000 4 5000 2 Compliance is checked by plotting frequency response on the same scales as the mask and adjusting the mask for best fit The limit values shown are not absolute values but arbitrary relative levels with respect to the mid point of the mask at 1 kHz e The figures in parenthesis are shown for guidance only and indicate the preferred performance at 100 Hz and 5000 Hz 46 PTC 200 May 2006 e The receive response mask is deliberately flat the cable response being totally compensated for by the send response m
202. up on the line at the same time The timing set for such test calls should be discussed with the installer The timing set for test calls from this equipment may be subject to drift If this proves to be inconvenient and your calls are interrupted then the problem of timing should be discussed with the equipment installer The matter should NOT be reported as a fault to Telecom Faults Service e A typical example of such equipment is an alarm system designed to make calls in an emergency 67 PTC 200 May 2006 6 10 D C line feed to other devices 1 For series connected equipment all ports for connection to other items of CPE shall provide a d c line feed This may be sourced from the PSTN as specified in clause 6 9 1 or locally powered 2 There are two alternative recommended methods of locally powered line feed as follows a 50 V d c fed via a constant impedance source commonly 400 Ohms with current usually limited at around 60 80 mA b Constant or restricted current in the range 18 mA to 45 mA s It is expected that for most applications clause 2 b will apply Method 2 a is that normally used in Telecom exchanges e The line feed is normally applied as negative battery relative to earth on one wire and earth on the other This is not however mandatory for this application CPE devices are required to be polarity insensitive so it is not necessary to specify a particular polarity for line feed
203. used while a call is in progress Repeat calling is the function whereby equipment will automatically make a second 32 PTC 200 May 2006 or subsequent attempt to call a wanted number without intervention by a user e Repeat calling does not include functions such as Last Number re dial LNR which have to be initially keyed by the user before they are activated However any function which is automatically activated is included Return loss is a quantity associated with the degree of match between two impedances in a 2 wire speech path expressed in decibels and given by the expression Return loss of Z4 versus Z 20 log I Z1 Z2 z Z dB e Reference ITU T Recommendation G 122 1993 Annex B1 Ring trip is the process whereby the exchange ringing signal is automatically stopped when a suitable direct current path is connected across the line e The capacitor in the on hook termination blocks the path for any direct current but allows alternating current to flow through the ringers A d c path is provided when the call is answered and the current then flowing is referred to as the loop current Ringer or ringing detector is any device which responds to the alternating voltage applied to a telephone to indicate an incoming call e It should be noted that operation of a ringing detector does not indicate that an incoming call has been answered It simply indicates the presence of an incoming call Ringer Appro
204. volume control e These tests are carried out at minimum and maximum as they are normally the only readily discernable settings for a continuously variable volume control The intention is to demonstrate that the two extremes do in fact fit within the specified performance range 50 PTC 200 May 2006 2 When the volume control is set to maximum the receive loudness rating shall be no louder than 14 dB at any line current ref clause 4 10 4 3 It is strongly recommended that the volume control resets to a default setting when the device is restored to the on hook state This default setting should be such that the receive loudness rating resets to within the normal range 3 5 dB to 9 5 dB ref clause 4 10 4 4 It is preferable that the requirements of clause 4 10 4 b be complied with at both minimum and maximum settings of the volume control 5 User controlled volume controls shall not affect compliance with either the d c voltage or the send performance characteristics 6 The frequency response of a telephone in this class should preferably lie within the receive frequency requirements of clause 4 9 2 for both the minimum and the maximum setting of the volume control 4 15 Telephony security in on hook condition 1 The security of telephony devices between the transmitter and line while the device is on hook is adequately covered by clause 4 3 1 3 2 Additionally no component or combination of comp
205. ween a PSTN line and another item of customer equipment e The functions of a series connected device are auxiliary to those of the terminal device to which it is connected Typical examples are distinctive alert decoders fax switches automatic diallers caller display adjunct units call monitoring equipment etc This term does not embrace items such as 33 PTC 200 May 2006 jackpoints wiring etc e A series connected device may have either a terminating or non terminating function and may also include bridging equipment in some cases e Certain types of CPE incorporate a 2 wire 4 wire 2 wire process Examples of this are some small key systems and also equipment which facilitates the extension of a PSTN line foreign exchange or PABX extension to a distant location These examples provide for amplification on the 4 wire path of the equipment but are connected 2 wire at both end interfaces and effectively fall within the above definition of series connected equipment Sidetone is the reproduction in a telephone receiver of sounds picked up by the microphone of the same telephone e For telephone evaluation purposes sidetone is measured as the Sidetone Masking Rating or STMR which is part of the Loudness Rating concept STMR is a measurement related to an ITU T standard test system and it also takes into account the overall effect of what the speaker would hear of his own voice in normal conversation e Reference ITU T R
206. wer faults or lightning strikes causing a rise in earth potential in the vicinity of the customer s premises insulation breakdown is likely to result 2 Details of any earth connections required and the most appropriate ways of providing them shall be incorporated within the User Instructions supplied with the equipment concerned 2 9 Protection from line interference 1 Telecom s original standard Master sockets incorporated a British Telecom Type 11A gas type surge suppressor which provided some protection against line to line transients This was regarded as the primary protection stage for many line powered telephones 20 PTC 200 May 2006 e Telecommunications administrations in most countries do not provide such suppression devices 2 As a result of extensive network changes Telecom has reviewed its customer premises wiring practices and has introduced 2 wiring see Section 10 With this arrangement the BT Type 11A suppressor will no longer be fitted to new or re wired installations In view of this change customer equipment is now required to satisfy the requirements of Section 6 of AS NZS 3260 1993 without placing any reliance on the presence of surge suppressors e A higher grade of surge protection will generally be installed in those areas with a known history of lightning damage or high risk of a rise in earth potential 3 There is no mandatory requirement for customer equipment to remain fully operational
207. which the equipment is ready to automatically answer an incoming call 26 PTC 200 May 2006 e Equipment can often be set to answer automatically or be set for manual answering while the user is present Requirements for automatic answering apply only while the equipment is in the auto answering mode Auto calling is the function whereby equipment automatically initiates a call without deliberate human intervention e Auto calling does not include calls made by devices using functions such as memory dialling or last number redial which are initiated by manual operation of a key or similar action Such functions are categorised as Auto dialling Auto dialling is a function whereby equipment automatically dials a number following some form of manually initiation Bridging equipment is high impedance equipment designed for connection in parallel with customer terminating equipment but which does not provide any form of line termination e Bridging equipment remains connected to the line whether the terminal equipment is on hook or off hook It does not provide any line control function but is used for such functions as monitoring detecting etc Call waiting is a network service provided by Telecom whereby a brief tone is applied repeatedly on a call already in progress to indicate that there is another incoming call waiting for the customer concerned Caller Display is the Telecom service which using the on hook data
208. with the Telecom account which may include calls not shown on the log 104 PTC 200 May 2006 8 2 1 Call answering automatic answering equipment 2 Some parameters required for compliance with Telecom s Telepermit requirements are dependent on the equipment PC associated with this device In order to operate within the limits for compliance with Telecom s Specifications the associated equipment shall be set to ensure that calls are answered between 3 and 30 seconds of receipt of ringing 8 5 Recording functions 3 All persons using this device for recording telephone conversations shall comply with New Zealand law This requires that at least one party to the conversation is to be aware that it is being recorded In addition the Principles enumerated in the Privacy Act 1993 shall be complied with in respect to the nature of the personal information collected the purpose for its collection how it is used and what is disclosed to any other party 10 3 3 Fault clearance 2 In the event of any problem with this device it is to be disconnected and a CPE item connected to one of its terminal ports may be connected directly in its place The user should then arrange for the product to be repaired Should the matter be reported to Telecom as a wiring fault and the fault is proven to be due to this product a call out charge will be incurred 105 PTC 200 May 2006 PTC 200 APPENDIX 1 SAMPLES AND EVALUATION
209. ximate Loading RAL is an arbitrary rating for a telephone ringer which represents in numeric terms the approximate current that it draws from a ringing signal s The reference value for RAL is based on the on hook admittance reciprocal of the impedance of a reference telephone This has now been replaced by Ringing Number RN Ringer loading is a rating for a ringing device based on the ringing current drawn when that device is connected in parallel with other ringing devices on the same line Ringing Number RN is an arbitrary rating for a ringing device which represents in numeric terms a combination of its sensitivity and loading on the ringing supply e The RN of a device is the greater of the numbers allocated for ringer sensitivity and ringer loading e RN supersedes RAL It is intended to provide a Telecom customer with an effective means of assessing the maximum number of ringers that may be connected to the same line and still ensure a reliable ringing performance Ringer sensitivity is a rating number allocated to a ringing device indicating the sensitivity of its response to ringing current on a line Sample Are a number of items randomly selected from a larger quantity for the purposes of statistical prediction of the characteristics of the whole quantity of items Scrambler see Voice privacy equipment Series connected device is any customer premises equipment designed for connection bet
210. y BT3 Timed break recall TBR is a manually initiated break of a pre set duration in the holding loop of a telephone when in the off hook condition for extending a recall signal to the exchange Two wire connection refers to the arrangement which provides for connection of 2 wire devices such that the ringing current is taken directly from the 2 wire line e 2 wire devices can also be connected to 3 wire customer premises wiring Voice privacy equipment is equipment designed to provide for the security of voice communications by means of two or more matched devices which encode voice signals sent to line and reconstitute received coded signals into intelligible voice signals e Privacy equipment is sometimes known as voice scramblers Volume unit VU is a unit of measurement used for determining the level of speech signals transmitted over a transmission line e On CPE VUS are used as a means of assessing the performance of voice recordings on answering 35 PTC 200 May 2006 machines voice mail equipment etc e There are a number of variations around the world of the types of VU meter and also in the definition of VUs Comparisons between different types of volume meters are given in ITU T Rec P 52 1993 36 PTC 200 May 2006 4 TRANSMISSION REQUIREMENTS 4 1 General 1 Due to the fact that this Specification embraces a wide range of product types and complexities some of the differences are addressed as
211. y delay in completing the speech path may result in that party dropping the call 6 The dialling feature may initially drop back to a hold condition in accordance with sub clause 3 In such cases the hold condition may be indicated by a message on the associated display to the effect Pick up phone e Because of their varying characteristics not all telephones and automatic diallers can be relied upon to work in combination or provide an effective handover from one to the other 6 6 Line breaks The duration of any undefined interruption or random break in the d c path caused by the equipment shall not exceed 9 ms 6 7 On hook line current 1 The total current drawn by all equipment connected to a PSTN line within a customer s premises in the idle condition shall not exceed 1 mA 2 In the on hook state the direct current drawn from a nominal 50 V supply by any single item of equipment shall be not greater than 120 pA e The on hook current drain should be as low as possible to allow customers the freedom to install several telephones without undue risk of exceeding the maximum value for the line 6 8 Recall and call waiting 1 The recall facility is in the form of a timed break in the holding loop condition during a Call and it is known as timed break recall or TBR It is strongly recommended that this facility is provided on telephony devices 64 PTC 200 May 2006 2 To activate call waiting it is necessary to
212. ys relays etc shall function reliably amp positively at all times Yes No Complies Yes No Modifications Full details of all modifications carried out by applicant prior to testing shall be supplied to the Testing Laboratory and furnished with the application Yes No Complies Yes No Full details of all modifications carried out in association with the Testing Laboratory to achieve compliance shall be recorded as part of the Test Report Yes No Complies Yes No Photographs Detailed colour photographs shall be supplied with each application Photographs should preferably be taken by the Testing Laboratory and included as part of the Test Report or Yes No Complies Yes No If supplied by the applicant photographs shall be verified by the Testing Laboratory Yes No Complies Yes No USER DOCUMENTATION Installation Instructions Yes No Operating Instructions Yes No Special Conditions List of warnings All applicable warnings to be listed PTC 200 May 2006

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