Quad ADPCM Voice Compression Card for the Elan
Contents
1. FAX CELP ADPCM ical 7 Elan Internal Option Slot Elan BUS Power Connection Position Switch Ribbon Cable Socket Rear View CA ADPCM VOICE lt x gt N rd d v4 ia A R149 Volcs Module PCB 8 lt SALES 0118 965 5100 lt 4 Quad ADPCM Voice Compression Voice Channel Signalling The ADPCM module supports pulse E amp M DC5 dialling between telephone or PABX systems It will also carry tone Basic AC15 and DTMEF signalling providing that the bandwidth allocated to the channel is sufficient This is discussed further in the installation section ACI5 signalling uses a tone of 2280 Hertz pulsed at the same rate as DCS or E amp M that is 10pps AC15 is often preferred since many PABXs incorporate AC15 signalling as standard and no cost is incurred purchasing signalling converters Providing that sufficient bandwidth is allocated the ADPCM card option supports basic AC15 signalling without the need for such converters Voice Tie Line The diagram below illustrates a voice Tie Line connection Extension telephones may direct dial extensions at the remote location and call out or receive calls from the PSTN connected to the remote location RAR RAR Y y Y Y y Y ID 72 ID 9 PABX PABX 2 Es Meline Mux with Mux with Nesting Voice Option Voice Option To Public To Public Network Network Voice Tie Line Re2. Black Box Catalog Tel 03 3820 5011 Fax 03 3820 5010 Web Site www blackbox co jp France Black Box Catalogue Tel 0145606700 Fax 0145606747 Web Site www blackbox fr Spain Black Box Comunicaciones S A Tel 3491 663 0200 Fax 34 91 661 84 35 Web Site www blackbox es Quad ADPCM Voice Compression U S A Black Box Corporation Tel 724 746 5500 Fax 724 746 0746 Web Site www blackbox com Chile Black Box Chile Tel 00 562 223 8811 Fax 00 562 225 1002 Web Site www Blackbox cl TECHNICAL 0118 931 2233 lt 3 Quad ADPCM Voice Compression ELAN ADPCM VOICE Option User Manual Supplement WARNING BEFORE INSTALLATION PLEASE REFER TO SAFETY INSTRUCTIONS IN APPENDIX A 4 lt SALES 0118 965 5100 lt 4 Quad ADPCM Voice Compression Contents O 6 A A 7 Mechanical OS ICON a 8 Voice Channel Signalling sriain te Ze a aaa a taaa 9 VOICE TIC Lese ee ars er 9 TelephonS AA EE AT EE AT E 9 VOICE Piggy ON 10 ICAA UMA OM erben 11 Voice Channel Configuration san rer 11 ADPCM SCID DISD IOV an ada diia it AAA aa 12 Voice Channel Pafamelers urn caleta 13 Voice Quay BWIN rr a 14 Installation aniani anaa A A T A arene terete cinry er terrence eit ee ertn eee ironic ert 15 Option Module nl aa TS 15 MR A ioe draradouidaunatands 16 VoicE Loop a ne ee ef 16 Voice Interface Cabling COME ea ee ler 17 Volce Impedance Matilda nad a A 18 Voice Signalling Configuration ans ES 19 Appendix A MN AMINgS an
3. yy E ILEEFE EE E EE lt gt BLA K x Nov 93 Version 1 0 Quad ADPCM Voice Compression Card for the ELAN Multiplexer MXU9046C Elan Junior with Quad ADPCM Voice Compression France Only MXF9600 A411 Quad ADPCM Voice Compression Card for the Elan Multiplexer TECHNICAL SALES FAX ADDRESS WEB 0118 965 6000 0118 965 5100 0118 965 5001 464 Basingstoke Road Reading Berkshire RG2 0QN www blackbox co uk Quad ADPCM Voice Compression How To Contact your Local Black Box Italy Black Box Italia S P A Tel 0227400280 Fax 0227400219 Web Site www blackbox it Deutschland Black Box Deutschland Tel 0811 5541 0 Fax 0811 5541 499 Web Site www blackbox deutschland com Switzerland Datacom Black Box Services AG Tel 0554517070 Fax 0554517075 Web Site www black box ch Netherlands Black Box Datacom BV Tel 03032417799 Fax 0302414746 Web Site www blackbox nl Belgium Black Box Tel 027258550 Fax 027259212 Web Site www blackbox be 2 lt SALES 0118 965 5100 lt 4 Australia Black Box Catalog Australia PTY LTD Tel 0398797100 Fax 0398702955 Brazil Black Box Do Brasil Tel 011 5515 4000 Fax 011 5515 4002 Web Site www blackbox com br Canada Black Box Canada Corp Tel 0416 736 8000 Fax 0416 736 7348 Web Site www blackbox com Mexico Black Box De Mexico S A de C V Tel 05 420 0100 Fax 05 420 0123 Web Site www blackbox com mx Japan
4. The LOCAL and REMOTE setup pages are accessed as usual to configure either location Channels may be copied in the same way as TDM channels TECHNICAL 0118 931 2233 lt 13 Quad ADPCM Voice Compression Voice Quality Bandwidth The sampling rate used for each voice channel is totally at the discretion of the user depending on the voice quality required The highest quality achievable is at 32000bps 4 bit sampling With this selection voice quality is extremely good near Toll Quality At 16000bps 2 bit sampling quality is again very good the most obvious difference being slightly increased background noise In each of the above cases the bandwidth available to speech and signalling is 3 4Khz Bandwidth falls off linearly with bit rate towards a minimum of 1 7Khz at either 16000bps 4 bit or 8000bps 2 bit sampling This must be born in mind if AC15 signalling MODEM Tones of FAX tones are to be suitably preserved The following table shows bandwidth calculated at various bit rates ADPCM BANDWIDTH bps bps KHz 32000 16000 3400 31000 15500 3294 30000 15000 3188 29000 14500 3081 28000 14000 2975 27000 13500 2869 26000 13000 2763 25000 12500 2656 24000 12000 2550 23000 11500 2444 22000 11000 2338 21000 10500 2231 20000 10000 2125 19000 9500 2019 18000 9000 1913 17000 8500 1806 16000 8000 1700 Note Avoid bandwidths shaded if AC15 signalling is to be used FAX transmission behaves similarly I
5. 2 4 O P Gain 0dB 0dB I P Gain 5 3dB 3dB E lead ref A A Sampling 4 bit 2 bit Mode B RUN RUN Cursor Keys to move CTRL U to save ESC to quit Use lt SPACEBAR gt lt gt lt gt to select This display is an example of a four channel ADPCM configuration screen The one two or three channel card displays are similar The unused channel columns are of course not displayed 12 lt SALES 0118 965 5100 lt Quad ADPCM Voice Compression Voice Channel Parameters Parameters for the voice channels are accessed by locating the cursor alongside the entry for a particular channel in exactly the same manner as used on the TDM MULTIPLEXER To view the valid choices for the parameter press the spacebar or keys The choices by parameter are PARAMETER CHOICES NOTES Voice channel selected Voice channel bit rate 0 Channel OFF 8000 to 16000 400bps steps With 2 bit sampling selected 16000 to 32000 400bps steps With 4 bit sampling selected Wire 2 or 4 Analogue interface for voice connection O P Gain 6dB 3dB OdB 3dB 6dB Receive gain setting for voice OdB 12dB 15dB circuit VP Gain 6dB 3dB OdB 3dB 6dB Transmit gain setting for voice 9dB 12dB 15dB circuit E lead ref A or B Link settings are required to change E lead NO NC settings refer to manufacturer Sampling 2 bit 2 bit sample 8K to 16K or 4 bit 4 bit sample 16K to 32K Mode RUN Channel run or loop LOOP
6. ensure safe operation such that the user and TELECOM Network are adequately protected It must not under any circumstances be operated without an earth connection which could nullify its approval for connection to a network WARNING INSTALLATION OF EQUIPMENT Installation of this equipment must only be performed by suitably trained service personnel WARNING CONNECTION OF OTHER EQUIPMENT This equipment allows connection only of suitably approved equipment to its ports the safety status of which are defined below TNV Ports i Voice 1 11 Voice 2 The above named ports are classified as TNV Telecom Network Voltage in accordance with Clause 4 2 of EN41003 and must only be connected to equipment which similarly complies with the TNV safety classification 20 lt SALES 0118 965 5100 lt
7. MM QUID EEE CHI CH 2 gt CH 3 CH 4 SUPERVISOR of Jo Al Jo of Jo of N Jo of Jo U paiia LZ CH 6 CH7 E 8 HSC ALARM iJ x 7 High Speed Alarm V 24 AN V11 V j Channels a 11 V 24 Relay 28 8Kbps J C To 126 4Kbps ort J TECHNICAL 0118 931 2233 lt 15 Quad ADPCM Voice Compression Option Card Position Selector The option module can occupy any physical position in the enclosure but the software will recognise each card by the position selected on the switches at the front of the card This switch is located at the front of the card as can be seen in the illustration on page 8 The switches shown white are in the on position when l pushed down and should be set as follows EN 1 2 3 4 Option slot 1 shown ON OFF OFF OFF OFF ON OFF OFF ON ON OFF OFF Option slot 2 Option slot 3 Voice Loop Testing Adjacent voice channels may be looped to themselves or to each other for test purposes This allows local PABX connection tests to be performed at a single site location To carry out a channel loop test configure a single channel Mode parameter to LOOP on the ADPCM setup page This will loop voice signals on this channel back i e speech will be heard echoing in the earpiece Adjacent channels 1 and 2 or 3 and 4 may be looped to each other speech at the telephone attached to Channel 1 will be heard at the earpiece of the telephone at Channel 2 and vice versa This
8. einander 20 TECHNICAL 0118 931 2233 lt 5 Quad ADPCM Voice Compression Introduction This User Manual Supplement describes Installation Operation and Use of the ELAN ADPCM Option card and must be read in conjunction with the ELAN Multiplexer User manual The ELAN ADPCM voice option allows the ELAN multiplexer to transmit voice traffic on the same composite link as data It compresses voice signals using the ADPCM Adaptive Differential Pulse Code Modulation algorithm allowing many voice channels to be carried through the digital data network Each card hosts 2 voice channels Typical use of the ADPCM voice channels is to interconnect two or more PABX systems If ADPCM is used over a 64K digital circuit up to 6 tie lines may be replaced using a single 3U ELAN multiplexer A number of hardware configurations are achievable including Tie Line replacement PABX Extension Extension Piggy Back or a simple Hot line Some of these are illustrated on pages 9 and 10 Installation details for the ADPCM VOICE module are covered in the installation section on pages 15 19 6 lt SALES 0118 965 5100 lt 4 Quad ADPCM Voice Compression PABX Standalone Handset and or FAX machine a fra Ll Standalone Handsets and or FAX machines DN ADPCM Digitised P Voice Card Digital Composite Functional Overview The Elan ADPCM voice o
9. f 2PABX CDR Telephone Extensions The voice card may be used to extend an extension line to a remote site as shown in the following diagram This allows the remote telephone to behave as if it is directly connected to the PABX Note that this may not be suitable for extending Key System extensions as there is no standard for Key System extension interfaces TECHNICAL 0118 931 2233 9 Quad ADPCM Voice Compression ae Mux with Mux with Voice Option Voice Option Numa i To Puni PABX Ext Netware FABDA_Extension Ref PABXEXT CDR Voice Piggy Back A piggy back arrangement using telephone extensions and trunk lines may be arranged as shown below This gives less flexibility than the Tie Line approach as direct extension dialling is not possible in the extension to trunk direction RILO Extension lt E Mux with Mux with ROLI Voice Option Voice Option Na Naya To Public To Public Network Network Voice Piggy Back FR Suitable signalling converters ROLI RILOI are available from Black Box 10 lt SALES 0118 965 5100 lt Quad ADPCM Voice Compression Use amp Configuration OPTION 3 The voice channel Options can be modified using the simple terminal configuration process described in the next section EN similar to that for the ELAN MULTIPLEXER Assuming that the composite link and the option card are mm functionin
10. g correctly at least three lights should be illuminated on the front panel namely STATUS LINK A je and one two or three of the OPTION lights The option ur ver card lights are lit if the related card is fitted Voice Channel Configuration This section only describes configuration of the ELAN ADPCM voice option card Configuration of MULTIPLEXER TDM channels is described in the Configuration section ofthe ELAN MULTIPLEXER manual If you are not familiar with general configuration of the ELAN MULTIPLEXER please refer to the Use amp Configuration section of the ELAN MULTIPLEXER user manual before reading the following sections or attempting to configure the ADPCM VOICE option card TECHNICAL 0118 931 2233 lt 11 Quad ADPCM Voice Compression ADPCM Setup Display The ADPCM VOICE configuration display shown below is reached from any other configuration page by locating the cursor in the upper right area of the screen alongside the Option number relating to the ADPCM option board to be examined or updated then pressing return Black Box Catalogue Ltd ELAN TIME DIVISION MULTIPLEXER VX XX 14433 05 11 93 Mode B Normal Baseboard TDM 8 Channel Link Clock B EXT 64000 Option 1 ADPCM 2 Chan Vel Carrier B Present Option 2 NOT FITTED Residual 1600 Option 3 NOT FITTED Configure LOCAL System B Management OPTION CARD 1 ADPCM 2 CHANNEL Vx xx Channel 1 2 Rate y 32000 16000 Wire
11. is achieved by setting both of the two adjacent channels LOOP mode as before 16 lt SALES 0118 965 5100 lt Quad ADPCM Voice Compression Voice Interface Cabling amp Connections Suitable connection may be arranged using a Krone wallboxes type 251 or similar The private voice equipment is connected to the Krone strips in the wallbox using a Krone IDC tool Each pair of voice channels is wired using two RJ45 cables to a 237A type Krone connection block as follows Krone Colour Name Type pair Ch1 Ch2 Ch3 Ch4 Ch5 Ch6 etc RJ45 pin 4 la 6a Blue RXa TXa O P when 4 wire T O when 2 wire 5 1b 6b White Blue RXb TXb O P when 4 wire T O when 2 wire White Green UP 4 wire only EM 2b 7b VP 4 wire only 3a 8a White Brown O P Closing Contact to ground 3b 8b Brown E Lead Reference Signal ground for UK link positions 4b 9b White Orange M Lead Reference Internal 12V bias Do not connect Where the following types apply O P Output from multiplexer I P Input to multiplexer VO Both input and output Xa Xb E M Connection may be made directly to the RJ45 connector where the connection is to Private PABX equipment It is an approval requirement that the RJ45 connector tabs must be clipped short to prevent user access The above cables may be ordered separately where required from Black Box TECHNICAL 0118 931 2233 lt 17 Quad ADPCM Voice Compression Voice Impedance Matching The port i
12. mpedances are standard for both 2 wire and 4 wire interfaces as follows 4 Wire Impedance 600 Ohms 600 Ohms O E O Return Loss better than 25dB 2 Wire Impedance Complex 310 nF 370 Ohms 620 Ohms Return Loss better than 30dB Transhybrid loss better than 17db then active echo cancellation The private system s impedance must be correctly matched to the above to achieve optimal echo cancellation 18 lt SALES 0118 965 5100 lt Quad ADPCM Voice Compression Voice Signalling Configuration The voice channels are configured for BT standard keying E amp M and AC15 unless specified by the customer Please contact Black Box if you require an alternative configuration If DC5 E amp M signalling will not function the most common cause is that there is no GROUND RETURN connection between the Multiplexer and the PABX system At least one of these SIGNAL GROUND connections must be made to the PABX ground for each voice card used The DCS E amp M and SIGNAL GROUND connections are not required for AC15 signalling AC15 signalling requires sufficient bandwidth to allow the 2280Hz signalling tones to be passed without degradation This should be considered with reference to the table in the Voice Quality Bandwidth section on page 14 TECHNICAL 0118 931 2233 lt 19 Quad ADPCM Voice Compression Appendix A Warnings WARNING THIS EQUIPMENT MUST BE EARTHED This equipment relies on the EARTH connection to
13. ption provides excellent quality low bandwidth voice transmission over a digital data link using the ADPCM Adaptive Differential Pulse Code Modulation algorithm It compresses voice signal data to between 32Kbps and 8K bps depending on required voice quality de compressing and re constituting the analogue signal at the remote site The option is designed to interconnect PABXs using the inter PABX signalling protocols DCS also known as E amp M and ACIS5 TECHNICAL 0118 931 2233 7 Quad ADPCM Voice Compression The compression bit rate and other voice parameters are selected using the same configuration methods used for the ELAN MULTIPLEXER This is outlined in the ELAN MULTIPLEXER manual and in the Voice Channel Configuration section Mechanical Construction The ADPCM voice module is built onto a single printed circuit board assembly which must be installed in one of the three option slots in the ELAN MULTIPLEXER enclosure Two or four voice channels are fitted on each option card When operating correctly the MULTIPLEXER illuminates option LED 1 2 or 3 on the ELAN front panel depending on the physical position of the card within the MULTIPLEXER The following diagram shows the layout of the voice module ADPCM MODULE PCB Layout Plan View
14. t has been shown to work successfully even below 12000bps 2 bit but it is advisable to allow as much bandwidth as possible to ensure reliable transmission as external influences such as the kind of FAX machine PABX and Network losses also affect transmission quality significantly 14 lt SALES 0118 965 5100 lt Quad ADPCM Voice Compression Installation The multiplexer must be disconnected from the power supply and all peripheral connections before opening Option Module Installation With power turned OFF the screws on the left and right of the front panel are removed using a 3mm Allen Key to access the interior of the MULTIPLEXER Option modules are slid into position from the front of the enclosure using the card guides on each side panel The appropriate blanking panel should be removed before the option card is inserted This is achieved by removing four screws shown on the back panel These screws are used to retain the option card once fitted Power must be connected to the option module by its cable from any one of the three power sockets one or more should be vacant on the motherboard Once the BUS ribbon cable on the right hand side has been fitted only option switch setting remains below A Composite Links ZEN X21 V 24 or V 35 fos to 128Kbps 2 N wa As la F N o o OPT 1 four u o OFT en EEE A 7 of Jo of gt MM
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