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1. The relay transmission interface refer to 2 6 2 Relay transmission is available on the 25 pin female sub D AUX Socket It includes two isolated current loop inputs and two dry contact outputs The following table shows the pinout of the socket for this function Pin Function 13 Output loop n 2 b Output loop n 2 a 12 Output loop n 1 b Output loop n 1 a Il Input loop n 1 b Input loop n 1 a 10 Input loop n 2 b Input loop n 2 a 9 5V of internally supplied power supply All loops are isolated and bi directional free polarity The characteristics of the input loops are Input loop control current 6mA max 100 mA Resistance of input loop 560 Q current limiting series resistor Input loop isolation gt 1500 Vrms A 5V to 12V source may be connected directly on an input loop because the internal series resistor is dimensioned for this purpose For a higher voltage source it may be necessary to limit the input current The characteristics of the output loops are Maximum switching voltage output 350 V peak Maximum switching current output 120 mA Resistance of output loop lt 35Q Output loop isolation gt 1500 Vrms The 5V power supply is available from the unit to power a low consumption device maximum 300 mA current consumption or e g to power the input loops or LED indicators connected to the output loops 55 000 053 C SCOOP 4 User manual LAAS AETA A
2. 3 This is the net encoded audio bit rate the actual network occupation is higher because of the protocol overhead 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS Besides configuring the equipment operating mode this module monitors its status detection of alarm conditions On detecting operation or transmission faults the equipment switches on indicators and relay contacts Two alarm classes are defined e Internal alarm corresponds to a major fault internal to the equipment e External alarm corresponds to a fault whose origin is deemed external to the equipment for example transmission fault For maintenance purposes some test loops can be activated e Audio loop uncompressed audio data are looped from the input of the encoder to the input of the output conversion functional block This loop redirects the audio input to the audio outputs e Loop 3 or Codec loop compressed audio data are looped just before the network interface e Loop 2 or Network loop this loop sends the received data back to the network for the remote codec the effect is the same as a loop 3 when the transmission works correctly e Audio feedback loop audio output to audio input this allows the codec to send back to the remote codec the signal it receives after decoding and re encoding The following drawing schematically shows the test loops
3. ISDN transmission interface One SO interface U interface available for North America SAS automatic setting for incoming calls Audio coding algorithms audio modes G711 standard telephone Mono G722 SRT H221 H242 Mono CELP 7 kHz IP mode only Mono MPEG Audio Layer II M DM S JS 4 sub band ADPCM low delay M S TDAC ISDN mode only M Available bit rates depending on coding algorithm Leased line transmission 64 128 192 256 or 384 kbit s over one line or 2x64 kbit s over two lines IP transmission 24 kbit s to 384 kbit s ISDN 64 to 128 kbit s transmitted via 1 interface 1 or 2 B channels Audio interfaces Two analogue inputs and two analogue outputs with adjustable level Digital audio input and output AES EBU format Auxiliary functions Data channel 300 to 9600 bauds Relay transmission 2 isolated inputs and outputs Audio coordination channel Control and supervision Keyboard and LCD display on front panel Remote control serial port 50 programmable set up memories Ethernet remote control interface and embedded html server Table 1 Main features of the SCOOP 4 1 M Mono DM Dual Mono S Stereo JS Joint Stereo SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 2 Functions The following synoptic diagram shows the basic functions of the equipment Audio Conversion Encoding inputs Audio monitoring Transmission Interface
4. the unit will use these same settings for encoding and sending audio to the remote unit so that the remote unit can also decode the outgoing audio programme The whole process just takes a few seconds Of course all compatible coding configurations can be detected automatically by the SA System Note that the 5A system is only active for ISDN connections 2 2 8 SIP protocol and SDP The SIP protocol is a signalling protocol used for IP connections which allows the SCOOP4 to interoperate with IP phones and other SIP compatible audio codecs in a way similar to ISDN or POTS connections Details about the SIP protocols can be found in the annex refer to 6 2 Overview of the SIP protocol One significant advantage is the inclusion of SDP a protocol which allows the connecting devices to automatically negotiate and agree on the coding profile to use Thanks to this system it is not necessary to set the units in the same way before setting up a connection Moreover the calling party need not know how the remote unit is configured before initiating a link 2 3 Transmission interface The codec includes an Ethernet interface for IP protocol networks interfaces for transmission over leased lines and an ISDN interface is available in some versions 2 3 1 Ethernet interface The IP interface is a 10BaseT 100BaseT Ethernet interface allowing transmission of the audio programmes in a wide range of possible bit rates The SCOOP 4 implements
5. they may be still valid even after the unit moves to another location even though its IP configuration changes 3 5 4 Other information and settings The html page includes various other settings Many of these are reserved at the moment e Do not change the following parameters from their initial settings Codec mode leave SIP selected Multicast mode parameters not implemented yet e The system information includes the Ethernet MAC address unique and fixed for a given unit and the current IP address Be careful with the security passwor This optional feature is left blank in the initial factory setting SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 3 6 First level maintenance 3 6 1 Internal description To be added later 3 6 2 Internal configuration All the configuration is done in the factory and or it can be changed by means of the keyboard display interface without having to open the unit However a jumper may be set to prevent one alarm type to light on the red alarm LED on the back of the equipment Please consult us for such operation 3 6 3 Analysis of malfunctions The following table indicates the detected alarm conditions and their classification Bad start up of a microprocessor or interface fault detected on start up Table 3 List and classification of alarm conditions Excluding the case when an internal failure disables the management micro controll
6. transmission capacity depends on the coding algorithm as indicated by the table hereunder Coding type EDE transmission rate bit s MPEG Audio 4SB ADPCM Table 1 Capacity of data channel depending on type of coding 2 6 2 Relay transmission This function is currently only available in leased line transmission mode When this function is activated the codec transmits to the remote unit the status of two isolated current loops The remote unit then opens or closes relay contacts according to the transmitted status Conversely as the function is bi directional the codec activates its two relays dry isolated contacts depending on the status of the two current loops on the remote unit This function is only available when the main audio programme is MPEG or ADPCM encoded A typical application is the transmission of an on air signal the contact closure may be used for e g switching on a lamp or starting other devices When using MPEG coding relay transmission can be activated along with other auxiliary functions For ADPCM relay transmission is activated in place of the data channel 2 6 3 Coordination channel This function is currently only available in leased line transmission mode This function is available as an option It enables the transmission of an auxiliary audio channel or coordination or order wire channel along with the compressed audio by reserving 8 kbit s from the transmitted bit rat
7. 5 1 above f Important notice the SAVE button only uploads a section enclosed between two bold horizontal lines unlike the REFRESH button which refreshes the whole page SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 3 5 3 SIP registration and configuration data You can access these parameters if you click the SIP configuration button on the embedded server html page This is the only way to configure these settings and most cannot be set from the keypad except those mentioned in the following The following is an example screen copy and some comments about the displayed data SCOOP 4 IP Configuration AETA AUDIO SYSTEMS General configuration Codec mode SIP Multicast send Multicast receive Language English vi SAVE MODE REFRESH SIP Line Registering User 1006 Display name 1006 Registrar 10 0 50 120 Authentication User 1006 Authentication Password eeeeee Registration Status registered NAT Firewall traversal Outbound proxy STUN server STUN mode off v SAVE SIP REFRESH 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS Item Notes User Display name Refer to the network administrator and or the administrator of the SIP server Authentication user Often these three parameters have the same value as here but they may be different Authentication Refer to the network administrator and or the
8. AETA AUDIO SYSTEMS 6 Annexes 6 1 Complements on the algorithms and protocols used 6 1 1 Auxiliary data in the MPEG frames The auxiliary data are used for the following purposes e Reed Solomon error detection and correction J52 standard e Data channel e Other auxiliary information relay transmission and or auxiliary audio channel The insertion of this auxiliary information is an extension AAS proprietary format to MPEG However the frame structure remains compliant 6 1 2 Reed Solomon encoding In order to cope with possible transmission errors in the network Reed Solomon error correction coding can be added compliant with J52 recommendation Four correction modes are available in the SCOOP 4 e Mode 0 no error correction Reed Solomon coding disabled e Mode protection of only the control information and scale factors in the MPEG frame low redundancy so called unequal protection e Mode 2 protection of the whole frame moderate 2 5 redundancy so called low equal protection e Mode 3 protection of the whole frame high 10 redundancy so called high equal protection Higher redundancy increases the protection against errors but slightly degrades the audio quality as redundancy takes up part of the bit rate that could be allocated to audio coding Most often for a normal quality transmission link mode 1 is sufficient and it consumes little bit rate from the compressed data
9. administrator of the SIP server password Registrar IP address of the SIP registrar a symbolic name e g sipsrv mycomp com is accepted if recognised by the DNS Can be also read from the menu TOOLS Maintenance About Registration status read only data Shows that the unit is or is not successfully registered on the server Can be also read from the menu TOOLS Maintenance About Outbound proxy An outbound proxy is one way of getting access through a NAT router or a firewall Refer to the network administrator and or the administrator of the SIP server for this setting STUN server A STUN server is also one means of getting access through a NAT router If such server is available enter here its IP address or domain name STUN mode Enable or disable the use of the STUN server This allows to keep the address of the STUN server even when the function is disabled This setting is available from the menu SETUP Net Param STUN Mode Make sure to click the SAVE SIP button located at the bottom of this section if you want to actually write your changes into the SCOOP 4 In the Coding section you can define the desired encoding for outgoing calls However this is usually done from the keypad and LCD Note that the unit adjusts automatically for incoming calls so no preliminary codec setting is needed for receiving calls The registration data do not have to be changed often in normal operation In fact
10. audio programme might be heard especially when the resulting sampling rate is very different from that of the external device 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS If on the contrary it is decided to synchronise the external equipment at 32 48 or 96 kHz onto the transmission clock of the leased line interface the codec must be configured in master mode In this case the output is locked onto this clock and it can be used as a reference to synchronise the equipment connected to the codec output The digital audio signal at the codec input must then come from a device synchronised by this way 3 5 Initial setup of the Ethernet interface The SCOOP 4 includes a 100BaseT 10BaseT Ethernet interface and the audio transmission can take place over an IP network through this interface In addition it is always possible to use the Ethernet interface for remote controlling the unit via a TCP IP connection TCP port 6000 For IP audio transmission SCOOP 4 uses the SIP protocol which eases the setting up of a link The operation is similar to setting a call over the ISDN or PSTN The transmission can be done in two modes e Direct peer to peer transmission between two compatible units e Use of a SIP proxy server for the call setup 3 5 1 IP configuration Ethernet interface As avery first step the Ethernet interface must be assigned an IP address and related parameters This phase is v
11. connected on the female XLR socket and a digital output in AES EBU format is available on a male XLR socket e tis possible to select which input analog inputs or digital input is fed to the encoder for transmission On the receiving side the decoded signals are output both on the analog and digital outputs X24 V11 V35 interfaces labelled X24 V11 V35 and ALARM X24 V11 These sockets are used for the connection to data transmission equipment in the leased line mode The connectors are 15 point male Sub D type In the standard single codec mode only one port is used This is normally the main port X24 V11 V35 but it is possible to select the other port In the dual codec mode both ports must be used In this mode audio channel A is transmitted on the main port X24 V11 V35 and audio channel B is transmitted on the additional port labelled ALARM X24 V11 Alarm indicator and contacts This ALARM X24 V11 port also includes two form C relays providing isolated contacts which can signal alarm conditions e Internal alarm contact e External alarm contact A red LED indicator also indicates that an alarm relay is activated In the factory setup every alarm cause sets the LED on but by setting jumpers on the motherboard it is possible to program the indicator to react to only one type internal or external alarm The pin out of the socket and the detailed characteristics of t
12. look at an example diagram below a reporter on the move with a Scoopy wants to make a call to a SIP compliant codec located in the main station The reporter may be at home or at another location not necessarily known in advance Once the Scoopy is on and connected to the network it will register itself to a SIP registrar This registrar can be located on the LAN of the radio house but it may as well be elsewhere in the network Then the registrar knows where the Scoopy is what its IP address is On the radio house side a similar process takes place To call the codec of the radio house e g a SCOOP 4 the reporter just needs to know its SIP address which can be like studiol2cod radiomcr com indeed very similar to an e mail address To call the unit the reporter has to select the preferred audio coding mode on the Scoopy e g mono G722 then call the remote unit simply using this SIP address SIP URI What happens then on the network the Scoopy sends the request INVITE in SIP protocol to a proxy server often the same device 1s also the registrar To make things simple this proxy then relays and routes the request to its destination Resolving the SIP URI to a physical network and address uses mechanisms similar to those used for resolving URLs Several proxys may be involved in cascade to finally reach the desired destination but this does not have to be known or dealt with by the end devices The follo
13. lt Network Monitoring Supervision Audio Conversion Decoding outputs Control interface Figure 1 Functional diagram of equipment The audio signals to be transmitted are converted when needed to digital format then the encoding function reduces the bit rate using a selectable algorithm the resulting bit flow is sent to one of the available transmission interfaces permanent link data interfaces X21 X24 V35 ISDN lines SO or UO or an Ethernet interface The transmission interface functional block also extracts compressed data coming from the network and sends them to a decoding block that reproduces uncompressed audio data Last the audio signals are output to both digital and analogue outputs 2 1 Conversion of audio signals The analogue inputs and outputs are balanced and the input and output gains are adjustable The sampling frequency of the analogue lt digital converters depend on the operating mode The equipment also provides digital audio inputs outputs in AES EBU format The input to the encoder is selectable between the digital audio input and the analogue stereo input The output from the decoder is sent both to the digital output and the analogue stereo output The digital audio interfaces are usually locked to the digital audio input genlock mode but alternatively they can be synchronised to the internal clock reference of the codec Having the digital samples fr
14. the SIP protocol which allows it to interoperate with IP phones and other SIP compatible audio codecs in a way similar to ISDN or POTS connections Links can be set up in two ways e Peer to peer connection between two compatible units e Use of a SIP proxy server to set up the link Details about the SIP protocols can be found in the annex refer to 6 2 Overview of the SIP protocol DO e SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS The audio coding algorithm can be selected depending on the required quality and the available network bandwidth The following algorithms are currently available Codec Bit rate Audio Typical use main features bandwidth G711 64 kbit s 3 kHz Voice telephony Compatible with IP phones CELP 24 kbit s 7 kHz Suitable for high quality speech Low network bandwidth consumption 64 kbit s High quality speech MPEG Layer I 64 or 128 up to 20 kHz Highest quality suitable for speech and kbit s music In addition the Ethernet interface can be used for remote controlling the unit via a TCP IP connection TCP port 6000 2 3 2 Leased line interfaces For transmission over leased lines the codec includes two X24 V11 ports which can run at 64 kbit s 128 kbit s 192 kbit s 256 kbit s and 384 kbit s bit rates With most coding modes only one X24 V11 port is used In the 2 64 dual mono G722 mode the two ports provide two independent interfaces the equipment is similar
15. the best setting is to leave this blank SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 4 7 2 Call an ISDN number To set the link first set the desired encoding format MENU SETUP Cod Then enter the ISDN number of the destination and press the green phone button 66399 If a sub address is needed after the number enter the character and the sub address 4 digits max The number then has the form nnnn ssss e g 0912345678 32 When the selected encoder needs two B channels the units asks for a second number If the same number is suitable just press a second time the green phone button An error code is displayed in case of a failure of the link establishment Refer to annex 6 4 ISDN error causes to find the corresponding meaning 4 7 3 Receiving calls When the 5A System is active receiving calls is simple When a call is received the codec automatically unhooks and the units negotiate automatically a commonly acceptable coding algorithm and finally set the link automatically On the receiving side the unit will follow the calling unit When the 5A System is not active you should first configure the codec for the desired coding algorithm and configuration When a call is received the unit will synchronise with the calling device but the link will usually fail if the calling party has used another coding configuration than expected However if J52 is used by both parti
16. to two mono codecs When transmitting in the leased line mode the codec synchronises onto the network clock provided by the X24 V 11 interface In the specific 2 64 mode where the two ports are used the codec initially synchronises on port 1 but it changes the synchronisation port in case of a fault If no valid clock is available on the X24 V11 interfaces the system folds back to an internal clock 2 3 3 ISDN Interface On the ISDN side the codec includes one BRI interface SO or UO depending on equipment version allowing transmission over one or two 64 kbit s B channels Thus the total available bit rate ranges from 64 to 128 kbit s 1 to 2 B channels The codec synchronises itself onto the ISDN network clock when a link is active 2 4 Supervision and control interface These functional modules fulfil the control and supervision of the equipment configuration communication management status monitoring thanks to a keyboard an alphanumeric display LED indicators and remote control interfaces The remote control is possible either via a serial data port or through the Ethernet interface with a TCP IP connection In order to allow easy and quick programming of the codec for specific operational configurations the equipment features configuration memories or profiles When recalling a profile the codec is directly reconfigured with parameters that were stored beforehand in this profile by the operator
17. 22 dBm 0 3 dB Nominal input impedance 600 Q or 10 kQ menu setting SETUP Audio Analog Input Impedance Impedance balance TBD Common mode rejection ratio gt TBD dB measured with Z 600 Q 5 1 2 Analogue audio outputs Audio characteristics are measured over a 20 to 20 000 Hz bandwidth except when differently stated The outputs are balanced type using 3 pin male XLR sockets Maximum output level adjustable from 0 to 22 dBm 0 3 dB Nominal load impedance 600 Q or 10 KQ Output impedance lt 50 Q Symmetry gt TBD dB Z 150 Q 5 1 3 Digital audio input and output These interfaces comply with recommendation AES3 1992 They support a sampling rate from 28 to 96 kHz 5 1 4 Headphone output front panel This output 6 35 mm jack on front panel is for the connection of a 32 Q headphone It is also possible to plug a high impedance headphone however the maximum available power will be lower SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 5 1 5 Main X24 X21 V11 V35 interface The X24 V11 interface uses a 15 pin male Sub D connector The following table shows the pinout Signal Pin Signal Frame ground l Transmitted data Ta 2 9 Tb Transmitted data 3 10 Received data Ra 4 11 Rb Received data Indication la 5 12 Ib Indication Received clock Sa 6 13 Sb Received clock 7 14 Electrical ground 8 15 The codec does not transmit a C signal The codec can
18. 221 recommendation ensuring byte synchronisation and interchannel synchronisation when more than one 64 kbit s B channel is required for the desired bit rate e Interoperation procedures according to ITU T H242 recommendation e Inthe case of MPEG encoding optional protection against transmission errors Reed Solomon error correction codes Although J52 does not apply to leased line connections this error protection technique is also available for leased line transmission with the SCOOP 4 Details about MPEG and J52 can be found in the annexes refer to 6 1 Complements on the algorithms and protocols used It must be noted that thanks to the interoperation protocol J52 codecs when setting up a link can negotiate automatically and agree on a configuration that 1s compatible with the capability of both units regarding bit rate channel mode etc In this way when the units differ in their capability or make the resulting configuration may be different from expected beforehand but in most cases the link will work and audio will be transmitted As another useful consequence this also gives users more tolerance to mistakes when configuring the units on the two sides of the transmission links as the codecs will adapt automatically even with differences in the initial settings of the two units 2 2 4 MPEG coding for leased line or IP transmission J52 is only applicable to ISDN transmission and no inverse multiplexing is needed f
19. Audio Conversion Encoding inputs input i Audio nsmifsi n Network Pane feedback nterface Audio Conversion Decoding outputs output 2 5 Audio monitoring This function enables the monitoring of the audio input before encoding and the audio output after decoding the received signal and provides e A display of the signal level both at the encoder input and the decoder output e A test output on a stereo headphone jack monitoring either the encoder or decoder audio signals Note as the audio output is monitored immediately after decoding this monitoring position is not sensitive to the possible activation of the audio test loop see above diagram contrarily to the physical audio outputs both analog and digital OC a SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 2 6 Auxiliary functions 2 6 1 Data channel This function is currently only available in leased line transmission mode In leased line mode a bi directional data channel can be transmitted along with the compressed audio signals by reserving a fraction of the transmitted bit rate The equipment includes a serial asynchronous port for this purpose The data are transparently transmitted end to end hardware signalling is not available This function is only available when the main audio programme is MPEG or ADPCM encoded The interface speed is programmable at 300 1200 2400 4800 or 9600 bauds However the actual
20. I 4SB ADPCM 4SB ADPCM S Table 2 Possible values for configuration parameters P Er HD a zleje H z 9 This coding mode is not available in the leased line mode 6 This coding mode is available in IP mode only SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 3 4 Installation and set up 3 4 1 Mounting and connections Natural convection cools the equipment Avoid obstructing the openings on the flanges To operate the codec the minimum necessary connections to set up are see details in the rear panel description e Power supply e Audio inputs and outputs XLR sockets e Network interface depending on the networks used Ethernet interface ISDN line and or X24 V11 V35 interface s Whenever needed the ALARM X24 V11 socket must be connected to an external supervision system alarm relay contacts The pin out of the connectors is indicated in chapter 5 1 Characteristics of interfaces 3 4 2 Initial set up Before the first link the equipment must be configured according to the desired operation mode audio input output format coding type and parameters etc and the local conditions network interface parameters For using the keyboard a password may have to be entered After factory setting or after total configuration erasure the password is blank no password needed Afterwards a password can be programmed by the user if one is needed For more details abou
21. JOINT STEREO SAMPLING RATE L 416 kHz 24 kHz 32 kHz 48 kHz BIT RATE L__64 kb s 128 kb s 192 kb s 256 kb s 384 kb s ERROR CORRECTION L___MODE 0 MODE 1 MODE 2 MODE 3 MPEG L2 same parameters as L2 J52 but max 128 kb s in ISDN mode TDAC OPTIONAL Important notice limitations in bit rate depend on the transmission mode the equipment version and the software version This is especially true for MPEG coding SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 4 5 Handling the configuration profiles To be added later 4 6 Setting up a link in IP mode A link is set up in a similar way as an ISDN link The difference is mainly that instead of the telephone number we use either an IP address or a SIP URI Uniform Resource Identifier 4 6 1 Directly call an IP address This is the most basic way of setting the link It is suitable only if e The other unit is directly reachable i e there is no NAT Router or firewall blocking the connectivity The simplest case is when both units are on the same LAN e The IP address of the other unit is known To set the link first set the desired encoding format MENU SETUP Cod Then enter the IP address and press the green phone button When operating in this way it is preferable to leave blank the SIP registering data 4 6 2 Calling via a SIP server This is the technique when both units are registered on a SIP proxy server In this case ea
22. LAAS AETA AUDIO SYSTEMS SCOOP 4 Stereo audio codec for real time audio transmission User manual AETA AUDIO SYSTEMS 18 22 avenue Edouard Herriot Kepler 4 92350 Le Plessis Robinson FRANCE Tel 33 1 41 36 12 00 Fax 33 1 41 36 12 69 http www aeta audio com 55 000 053 C SCOOP 4 User manual Specifications subject to change All rights reserved by AAS November 2007 55 000 _053 c_scoop4 en doc LAAS AETA AUDIO SYSTEMS Table of contents e E 1 Sr PCOS ee E E E T E E 3 2 l Conversion of audio Signals eesesorirasiennien an en n anaE ENEE EEEE EEEREN EENE EENE 3 2 2 Ee ee RE EE 4 E Transmission WL CT CACC serura ninia ieS a EAA EEE a AEE teade sea a EEEE 6 2 4 Supervision and control interface cece ccceceesseseesseeseeeeeeeeseeeeeeeeeeeeeeeeeeeeeeeeesseseeeeeeeeeeeeeeeeeegs I EE 8 EELER EIERE 9 Je EE ON eoii EEEE NEEE EEE E NETE 10 Jl TCM SEAN Principle EE 10 3 2 Physical description of the eoupment 10 3 3 Eguipment configuration parameters ccscceivso acestaceesancassavevxadensadacdcasvdaeesapncosavevcedesbebevdsaueedeeenvess 17 EE O e SE EE 19 3 5 Initial setup of the Ethernet interface siesgeirdesinegagredeerdeegg ege rnr EnA EEES ITS 20 OF ist level eV EE EE 25 4 Detailed operating mode User interface ccssccccccrsssssssscsscccccsssecssssssscccssssseeees 27 41 Mam operation Te 21 EE 2 4 3 Description of the keyboard sssisssissssssssessissss
23. This interface uses a 9 pin female Sub D connector on the rear panel This is a V24 RS 232 type interface with only Tx and Rx signals no flow control The following table indicates its pinout DCE type pinout Function V24 data to the PC V24 control data from the PC Ground WE Not connected The interface is configured as follows 4800 bauds 8 bits no parity one stop bit 5 1 8 Data interface data This V24 interface uses a 9 pin female Sub D connector on the rear panel Like for the remote control interface only Tx and Rx are used there is no flow control and the pinout is of DCE type Function Received V24 data Transmitted V24 data Ground Not connected The data interface is configured as follows 8 bits no parity one stop bit It is possible see 4 4 1 TOOLS menu TOOLS Misc Aux Functions DATA CHANNEL to activate the interface and to configure its baud rate 300 to 9600 bauds However the maximum allowed baud rate depends on the audio coding used see 2 6 1 Data channel 5 1 9 Ethernet interface This RJ45 socket has standard Ethernet pinout for use of a normal straight cable to an Ethernet hub The installation and operation of this function is detailed in 3 5 Initial setup of the Ethernet interface 5 1 10 Digital I O interface TBD SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 5 1 11 Relay transmission interface AUX socket
24. UDIO SYSTEMS 5 1 12 Coordination channel interface AUX socket In addition to the loop control and relay transmission interfaces the optional coordination channel input and output are available on the 25 pin female sub D connector AUX Socket on the rear panel with pinout as indicated hereunder The input and output are balanced floating signals transformer isolated Maximum level 9 dBm Impedance 600 Q Nominal bandwidth 300 3400 Hz Coordination channel output Coordination channel output Frame ground Coordination channel input Coordination channel input Frame ground SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 5 1 13 Loop control interface AUX socket This function is not yet implemented The following table shows the wiring of the socket for this function E 17 Input loop n 2 a 18 Input loop n 1 a 19 Output loop n 2 a 20 Output loop n 1 a 21 OV of power supply All loops are isolated and bi directional free polarity The characteristics of the input loops are Input loop control current 6mA max 100 mA Resistance of input loop 560 Q current limiting series resistor Input loop isolation gt 1500 Vrms A 5V to 12V source may be connected directly on an input loop because the internal series resistor is dimensioned for this purpose For a higher voltage source it may be necessary to limit the input
25. al software gives full access to the codec functions configuration and status monitoring with a graphical interface and several units can be controlled from the same computer Details about this supervision software can be found in the documentation and user manual of the TeleScoop software In addition to this some parameters related to the Ethernet IP interface and transmission can be set by using an embedded HTML server these are described further in 3 5 2 Use of the embedded html server The SCOOP 4 can be remote controlled by third party codec management software and systems Please consult us for more information on the available offer in this field 3 2 Physical description of the equipment The SCOOP 4 codec is housed in a 19 inches chassis of 1U height 44 mm or 1 75 it includes a universal mains power supply 3 2 1 Front panel All the elements needed for local control are located on the front panel see picture on page 13 below This panel can be roughly divided in three areas On the left hand side one can find an LCD and the basic navigation and dialling keys The central area of the panel includes several status LEDs and a keypad for the entry of dialling numbers and or text data The right hand side groups audio monitoring elements SG The Esc key is also used to power the unit on and off When the unit is in standby the blue LED besides the Esc key is on hold the key depressed for at least 3 s
26. also be connected to V35 interfaces a specific adaptation cable is needed in such case The connection is described in Annex 6 5 V35 interface adaptation 5 1 6 Alarm X24 X21 interface This interface uses a 15 pin male Sub D connector The following table shows the pinout Internal alarm Common A Com l Transmitted data Ta 2 9 Tb Transmitted data Internal alarm NC IA C 3 10 IA O Internal alarm NO Received data Ra 4 11 Rb Received data Indication Ia 5 12 Ib Indication Received clock Sa 6 13 Sb Received clock External alarm NO EA O 7 14 EA C External alarm NC Electrical ground 8 15 EA Com External alarm Common The bold text refers to the alarm contacts Both are form C type The NO terminal is open when the alarm is set otherwise it is connected to the Common terminal The NC terminal is connected to the Common terminal when the alarm is set otherwise it is open The current and voltage handling capabilities of the relays are Maximum output current 120 mA Maximum output voltage 350 V peak Resistance of output loop lt 35Q The codec does not transmit a C signal The codec can also be connected to V35 interfaces a specific adaptation cable is needed in such case The connection is described in Annex 6 5 V35 interface adaptation 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 5 1 7 Remote control interface
27. applications requiring different coding configurations in the two directions The J52 protocol allows such mode To give some examples it is possible to transmit MPEG Layer II in one direction and G722 in the other one or MPEG stereo in one direction and MPEG mono in the other one etc Specific product versions also allow asymmetric modes wherein one direction is G722 coded while the other one is TDAC coded Such mode is useful e g in order to get a low delay return path encoded in G722 while the send path is encoded with higher quality but a higher delay 2 2 7 5A System Setting an ISDN connection is often difficult at least because of the numerous coding parameters to be set Moreover with most proprietary algorithms it is mandatory for the two devices to have exactly the same settings otherwise the connection will fail and sometimes it is not easy to find out the reason 5A stands for Aeta Audio Advanced Automatic Adjustment This system makes it easier to set an ISDN connection because the codec on receiving a call automatically adjusts itself following the calling party algorithm and parameters When the 5A System is enabled on the unit and a call is received the unit first detects the coding algorithm used by the calling codec and also senses its parameters audio mode mono stereo sampling rate bit rate inverse multiplexing protocol etc Then the unit can decode the compressed audio from the remote unit In addition
28. ch unit is identified by its SIP URI in the form username sipservername like an email address There is no need to know any IP address and hence there is no problem if the IP address of a unit changes for whatever reason To set the link first set the desired encoding format embedded server or simply from the keypad MENU SETUP Cod Then enter the SIP URI of the unit to call and press the green phone button 4 6 3 Receiving calls This is very simple in both cases direct peer to peer link or SIP server There is nothing to do When a call is received the units negotiate automatically a commonly acceptable coding algorithm and set the link automatically On the receiving side the unit will follow the calling unit 4 6 4 Network quality setting Depending on the quality of service provided on the network especially its jitter performance it is possible to change the stability latency compromise used by the Scoop 4 For this purpose a setting 1s available in the menu SETUP Param Network Quality Three choices are proposed e HIGH suitable for a good quality and low jitter network latency is minimal but the codec will have little tolerance to possible jitter e MIDDLE intermediate and default setting suitable for a moderate transmission jitter e LOW to be preferred when the network has low QoS especially for residential ADSL lines This setting ensures a safer operatio
29. cted to the codec e an incorrect clock frequency De incompatible with the codec configuration On the other hand in case of a decoder alarm with no clock error possible causes are e lack of signal received from the X24 V11 interface due to a failure of the transmission device connected to the codec or a transmission failure in the network e a fault in the remote codec or else the remote codec has an incompatible configuration e transmission errors causing erratic alarms Errors such as AES error and AES sync loss can frequently be seen even when the unit is configured to use the analog inputs This is because the AES output is always active and by default genlocked to the AES input To avoid such undesired alarms When not using digital audio interfaces set the digital audio sync in Master mode SETUP Audio Digital Synchro Maste SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 4 Detailed operating mode User interface In local mode the unit is operated thanks to a keyboard and display on the front panel The display is an alphanumeric backlit LCD with two 20 character lines Operating from the keyboard can be protected by a password 8 digits maximum In such case the password must be entered to start a session and get access to the user menus The password can be changed or deleted by the user 4 1 Main operation modes There are two parameters which
30. current The characteristics of the output loops are Maximum switching voltage output 350 V peak Maximum switching current output 120 mA Resistance of output loop lt 35Q Output loop isolation gt 1500 Vrms The 5V power supply is available from the unit to power a low consumption device maximum 300 mA current consumption or e g to power the input loops or LED indicators connected to the output loops 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 5 2 Audio performance The audio performance in this part applies to the system without coding decoding and excluding the coordination channel The additional effect of the audio encoding and decoding on audio performance depends on the coding algorithm used and its parameters Except when differently stated the following measurements are done at a 6 dBm input level and on the AD DA path with maximum input and output level set at 16 dBu 5 2 1 Transmission gain The drift in time of the gain from the input to the output of the codec is less than 0 3 dB 5 2 2 Amplitude frequency response All measurements are done with a 6 dBm input signal and a reference frequency of 1020 Hz The measurements are done with a loopback before coding decoding so the possible effect of compression has no influence To be detailed 5 2 3 Group delay distortion Taking the minimum group delay as reference the group delay distortion on the AD DA path is alway
31. e ON for ISDN Protocol Euro ISDN S Local Number 1 Sub Address 1 Input Impedance E 600 Ohm Max Output Ivl 0 dBu 16 dBu KR 22 dBu Max Input Ivl 0 dBu 16 dBu a 22 dBu Synchro om a Genlock Sampling 32 kHz 48 kHz S 96 kHz Analog i AES Level Meter HEADROOM 0 dB 12 dB 40 dB Co Refer to COD sub menu As AETA AUDIO SYSTEMS Selection of the active port in normal mode Main port labelled X24 V11 V35 Secondary port labelled ALARM X24 V11 Selection of the preferred stability latency compromise see Setting up a link in IP mode Activate disable use of STUN Selection of local ISDN protocol Configuration of local line see Setting up a link in ISDN mode Defines the maximum analog level reached for a maximum level decoded signal 0 dBFS Defines the analog input clipping level sending a maximum level signal to the encoder 0 ABFS Note valid for Master mode Genlock mode follows AES input Refer to Audio monitoring section for this setting 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 4 4 4 COD sub menu Notes l Previous 1 Previous 2 Previous 3 Previous 4 Previous 5 Other G711 Not available in LL mode G722 H242 H242 only for ISDN mode H221 CELP Only for IP mode 4SB ADPCM MONO STEREO L2 J52 Only for ISDN mode CHANNEL MODE MPEG L2 with J52 L mono DUAL MONO STEREO
32. e This channel uses a compression algorithm of CELP HLTP type and provides a voice grade channel 300 3400 Hz pass band This function is only available when the main audio programme is MPEG or ADPCM encoded With ADPCM the coordination channel cannot be used along with other auxiliary functions i e data channel or relay transmission When using MPEG coding all three auxiliary functions can be activated at the same time Note that relay transmission and the coordination channel are only compatible with AAS products as these functions are not covered by independent standards 55 000 053 C SCOOP 4 User manual a 9 LAAS AETA AUDIO SYSTEMS 3 Operation 3 1 General principles The equipment control and supervision configuration status monitoring is possible in two ways e Local mode front panel keyboard and display status indicators e Remote control mode thanks to an asynchronous serial port or the Ethernet interface As a general rule the configuration parameters are saved in non volatile memory and restored when the unit 1s powered on Local mode operation is described in detail in chapter 4 Detailed operating mode Thanks to the remote control mode the codec can be operated from a computer with supervision software The supervision station is a PC computer running Windows 95 98 ME NT 2000 XP or Vista equipped with the TeleScoop configuration and monitoring software This option
33. e used if one line only is needed 1 and 2 if two lines are needed Currently the product can only be equipped with one ISDN interface Digital I O socket Reserved for future use AUX socket This 25 pin female sub D socket groups the interfaces for the relay transmission function and the optional coordination audio channel It also includes loop interfaces for the loop control function to be described later as well as a 5 V power supply that can be used to provide current for the loop and relay interfaces SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 3 3 Equipment configuration parameters The parameters may be divided into the following categories e Coding configuration parameters which include audio coding type coding frequency Fc and subsequently the nominal bandwidth audio channel mode and transmission bit rate Besides in case of MPEG coding it is possible to select the error protection mode e Configuration of the audio interfaces including selection of analogue or digital format for the audio input maximum level for the analogue inputs and outputs and synchronisation mode for the AES EBU interfaces e Parameters of the auxiliary functions possible activation of a data channel bit rate of this possible activation of the relay transmission possible activation of the auxiliary audio channel if this option is available e Parameters of the network access type of
34. e for a given parameter SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 4 4 1 TOOLS menu Notes lt Alarm 1 gt f lt Alarm n gt About L IP ADDRESS displays IP address VERSION displays version info SOFTWARE NS displays software serial number SIP REGISTRAR displays SIP registrar s address if any REGISTRAR STATUS displays status OK or NOK Ethernet Setup DHCP Manual LIP Address Mask Gateway DNS User Access switch Full 4 gt Reduced mode Confirm Password blank after factory reset Enter new password Confirm password Tests L No test loop j Audio loop Loop3 codec Loop2 Network Audio Feedback General Reset CONFIRM Yes No Aux Functions DATA CHANNEL Off S On RELAYS Off i On COORD CHANNEL Off On LCD Backlight Off On S LED Brightness Low Medium High Language L ENGLISH FRENCH 5A System concerns ISDN mode only Off On 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 4 4 2 DIR menu Notes Load Delete Edit New Load Delete Edit New This menu is not implemented for the moment SCOOP 4 User manual 55 000 053 C 4 4 3 SETUP menu Other to select other network Param for Leased Line mode Interface Kee l LL2 Mode KE DualCodec for IP transmission mode Network Setup Param DHCP S Manual L IP Address Mask Gateway DNS Network Quality Low Middle High STUN Mode P
35. e when interfacing the SCOOP 4 codec to DCE equipment using a V35 interface 6 5 1 Connection table The three leftmost columns show the pin allocation on the 15 pin connector of the codec The two columns on the right indicate the pinout on a 34 pin V35 connector or a 37 pin sub D connector Consult the DCE documentation for other connector types Only the bold indicated signals need be connected leave other pins unconnected However the frame ground pin 1 may be used for connecting the shield of the connection cord Pin number Function V35 signal _ 34 pin 37 pin connector connector X24 Signal signals direction Signal ground Data clock Data clock TTT Received data Received data TT Transmitted data Transmitted data Frame ground SCOOP 4 User manual 55 000 053 C
36. econds to switch the unit on When the unit is in operation press the key down for more than 3 seconds to switch it off In addition to this soft switch the unit automatically switches on when AC power is applied to its power socket SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS LCD and basic control keypad This part is used for configuration and call set up details cane be found in chapter 4 dealing with the operating mode The 2x20 character alphanumeric display is surrounded by the keys from left to right Release a link in IP or ISDN transmission mode yf Start a link or accept an incoming call in IP or ISDN transmission Unhook ko mode Navigation keys Menu dependent keys used to scroll options and or select an option in a menu The bottom line on the LCD shows the function of each key OK key Confirm a selection or enter data Bee d key Short pressure Escape to higher menu level Long pressure Switch on or switch off the unit The blue LED besides the Esc Power key is off in operation but lights on when the unit is in standby Status LED indicators The LEDs have the following meaning from left to right 4 Note some specific versions of the product cannot be switched off in such case a long pressure has no effect 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS Audio monitoring Two pairs of LED bargraphs display the l
37. ed by a resettable fuse The maximum power consumption is 15 W without the coordination channel option 5 4 Dimensions and weight The unit is a 19 inches frame of 1U height 44 mm or 1 75 and 252 mm depth 12 5 Its weight is about 3 2 kg 5 5 Environmental characteristics The equipment operates over a 0 C to 45 C ambient temperature range 32 F to 113 F and a 5 to 90 humidity ratio range The SCOOP 4 complies with CE directives regarding safety and EMC e Safety compliance with EN60950 e Susceptibility compliance with EN50082 1 e EMI radiated emissions complying with EN55022 class A conducted emissions complying with EN55022 class B 5 6 Versions Options The various versions available for the SCOOP 4 are the following e SCOOP 4 with Ethernet IP and leased line interfaces e SCOOP 4 with Ethernet IP leased line interfaces and one ISDN interface Besides certain functions are available as options e Audio coordination channel 5 Accessories and related products The SCOOP 4 is delivered with a mains cord and a CATS Ethernet cable Along with the coordination channel option a specific cable is delivered which provides XLR plugs for the coordination channel input and output input on a female plug output on a male plug For remote controlling SCOOP 4 units from a PC the TeleScoop supervision software is available separately 55 000 053 C SCOOP 4 User manual LAAS
38. er it is more complicated as a number of dedicated ports have to be opened and routed 6 3 3 Use of a SIP proxy A SIP proxy often can deal with the issue There are various options e g e Proxy on the external public side efficient when the router does not block outgoing traffic Such solution can be implemented e g by registering on public SIP servers e Proxy inside the LAN area efficient if the proxy server is allowed to receive and send dedicated traffic This solution is compatible with restrictive firewalls Port forwarding has to be set for the proxy to be able to receive calls from outside the LAN 6 3 4 STUN server In many cases a STUN server can be used instead of a dedicated proxy server STUN is a network protocol allowing a client behind a NAT router or multiple NATs to find out its public address the type of NAT it is behind and the internet side port associated by the NAT with a particular local port This information is used to set up UDP communication between two hosts that might be behind NAT routers If a STUN server is available a SCOOP 4 located behind a NAT router can use the server to complete successfully its call setup with a remote unit outside the NAT router 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 6 4 ISDN error causes The following table lists the call clearing causes The error message is typically CLEARED hh dd where hh is an hexadecimal number and dd i
39. er messages are displayed to indicate the anomaly or the fault can be searched using the menu The test loops accessible from the TESTS menu can help improve the analysis of a problem e In order to check if the audio part functions correctly use the Audio loop and check if the audio is OK at the output e To check if the coding part functions correctly activate Loop 3 and check if the alarm disappears and the decoding indicators come back to normal and if the audio 1s present at the output e Loop 2 sends back to the remote codec the compressed data received from the network see the description of test loops in 2 4 Supervision and control interface page 8 This way it is possible to test the integrity of the transmitted data and or check that the remote codec works properly The decoder out to encoder in loop Audio feedback loop can be used for overall functional check and also for aligning the overall chain 8 Minor alarms are readable on the display but do not trigger alarms contacts and LEDs 9 Fault of the network clock source currently used for synchronisation X21 X24 main port or secondary port 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS In leased line mode a clock fault is one typical cause of an external alarm This can be due to e complete loss of the X24 V11 interface due to a failure of the transmission line e a failure of the transmission device conne
40. ery simple when a DHCP server is available in the network Before going further connect the Ethernet interface to the network using CAT5 wiring e Connection to 10BaseT or 100BaseT interfaces are both suitable as the SCOOP 4 automatically switches to the right 10 Mbit s or 100 Mbit s mode e Straightforward patch cables should be used for a connection to a hub or a switch Conversely a crossed cable might be needed for special configurations e g a test connection to a PC As avery first step the Ethernet interface must be assigned an IP address and related parameters This phase is very simple when a DHCP server is available in the network The menu to use is reached by TOOLS Maintenance Ethernet Setup When Ethernet IP is the current interface for audio transmission an alternate path in the menu is SETUP Net Param Network Setup DHCP server available This is the simplest case because the server will allocate a suitable IP address and give the unit the right settings Select DHCP in the menu TOOLS Maintenance Ethernet Setup The unit will then automatically find the DHCP server and automatically set the parameters You can read the IP address allocated to the unit by the DHCP server in the About menu TOOLS Maintenance Ethernet Setup Note that as an additional advantage with DHCP you do not need to change this setting later even if you move the SCOOP 4 to another network a
41. es the link will succeed even without 5AS active 4 7 4 Quick redialling Once a number or a couple of numbers has been called it is easy to recall it without having to type it again press the green phone key then you can scroll through the history last dialled numbers using the arrows Press the phone key when the desired number is displayed This is especially useful for quickly redialling the previous number 4 8 Erasing and resetting the configuration In some cases like e g if the password is forgotten it may be necessary to restart from the factory default setting To erase the entire configuration and load the factory default settings you should normally go to the General Reset sub menu TOOLS Misc General Reset In case the keyboard is locked and you have lost the password hold the hang up key pressed for 10 seconds this forces the system directly to the General reset sub menu You can then confirm that you really want to erase all the settings including the password The factory default password is blank 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 5 Technical characteristics 5 1 Characteristics of interfaces 5 1 1 Analogue audio inputs Audio characteristics are measured over a 20 to 20 000 Hz bandwidth except when differently stated The inputs are balanced type using 3 pin female XLR sockets Maximum input level adjustable from 0 to
42. evel of the audio signals both on the transmission and reception directions The top bargraphs display the level of the audio channels on the transmitter encoder while the bottom bargraphs display the level of the received channels decoder side The 0 dB mark is a reference level that can be adjusted relatively to digital full scale the reference level can be set in the menu SETUP Audio Level Meter HEADROOM The OVLD LED at the right end of each bar shows when the signal reaches maximum digital level or clipping level regardless of the reference level setting SG OVLD always reacts to absolute full scale level while the bargraph level indication depends on the reference level setting The HEADROOM setting in the menu defines in dB the difference between the maximum level or digital full scale and the reference level for which 0 dB is displayed on the level meters Here are some examples e Ifthe headroom is set at 0 dB then the maximum displayed level is 0 dB note that OVLD will light on whenever the signal reaches this level or exceeds it on the analogue input e Ifthe headroom is set at 10 dB then 0 dB is displayed when the signal is 10 dB below maximum level or 10 dBFS The display in such case can reach up to 5 dB OVLD lights up when the signal reaches maximum level but not before The audio signals can also be monitored with a headphone connected on the front panel 1 4 or 6 35 mm
43. for voice transmission on public telephone networks This algorithm is typically used for links over IP networks with IP telephones or VoIP gateways Via ISDN G711 is used for links with telephones or hybrid devices G711 is available only for IP or ISDN transmission not over the leased line interfaces 2 2 2 Notes about G722 With G722 coding three synchronisation modes are available e Statistical recovery byte synchronisation method alias SRT e H221 synchronisation in this case 1 6 kbit s from the compressed data are used for this e H221 synchronisation and H242 protocol This is only available for the ISDN mode H221 synchronisation is highly recommended when possible as it features higher reliability and faster recovery time while degradation because of the bit rate used for framing is minimal H242 protocol the most flexible mode is recommended by the ITU T and is included in J52 However the mode with H221 synchronisation but without H242 protocol can be useful for compatibility with old generation codecs which did not use this protocol No specific synchronisation is needed for the IP mode SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 2 2 3 Notes about MPEG coding and J52 The ITU T J52 recommendation was defined in order to allow the interoperability of multimedia terminals over the ISDN using common coding standards It includes the following features e Framing as per ITU T H
44. have a major impact on the operation of the unit and on the user interface First the unit features three transmission modes transmission over Ethernet IP leased line mode and transmission over the ISDN In comparison with the permanent leased line connection IP and ISDN modes are dial up modes and bring a number of additional parameters to be controlled e dial number and or full SIP URI for the destination of a call e call set up and control e device SIP registration data or local ISDN number and sub address e miscellaneous network operation parameters The status display is slightly different in order to recall the transmission mode currently in use Second in the leased line mode the unit can be operated either as a normal single codec or as a dual codec capable to transmit two independent 7 kHz bandwidth audio channels This aspect has a big influence on the way the device is installed set up and monitored In the following the main operation modes are shortly designated as IP mode ISDN mode or LL mode for leased line mode and Single codec or Dual codec 4 2 Equipment start up During start up the unit displays temporary messages This initialisation lasts around one minute Then the main menu is displayed At this stage if the configuration includes a non blank password the keypad is locked and the password must be entered in order to access the menus just en
45. he alarm relays can be found in chapter 5 1 6 Alarm X24 X21 interface p 37 USB socket This host USB port is currently not used SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS Q k a Figure 3 Rear panel 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS Remote control Remote This 9 pin female sub D socket is an asynchronous serial interface port usable for remote controlling the equipment thanks to a control and supervision PC Data This 9 pin female sub D socket is an asynchronous serial interface port usable for transmission of a bi directional data channel refer above to 2 6 1 Data channel Ethernet interface This socket is a 100BaseT 10BaseT port used for audio transmission over IP and or for remote controlling the unit via a TCP IP connection TCP port 6000 This RJ45 socket is devised for a normal straight cable to an Ethernet hub or switch The two integrated LEDs show the presence and activity of the network green LED and the interface mode half duplex yellow LED off or full duplex yellow LED on The configuration of the interface is described in 3 5 1 IP configuration Ethernet interface ISDN 1 and ISDN 2 sockets These RJ45 sockets allow the connection to the ISDN for the product versions which include this capability Their layout is standard The sockets must be used according to their number 1 e 1 must b
46. hernet interface 6 2 3 Supported communication protocols The SCOOP 4 IP supports and or implements the following protocols e Ethernet TEEE802 1 e IP e DHCP client e HTTP embedded html server e TCP IP UDP IP transport protocols e SIP Session Initiation Protocol SDP Session Description Protocol e RTP RTCP SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 6 3 Some methods to deal with NAT routers and firewalls This problem arises when the desired connection has to go through a NAT router and or a firewall that blocks a direct IP communication This is a very common issue especially if one needs to set up a transfer via the Internet It is impossible here to describe in details the possible ways to deal with this problem but the following just shortly discusses some typical solutions One should decide the most suitable solution depending on the specific conditions Most probably a network administrator should be consulted for support and for granting adequate network authorisations and or privileges 6 3 1 DMZ The SCOOP 4 can be set in the DMZ of the router firewall In this way it is possible to reach directly the SCOOP 4 from outside the router However such a solution is not recommended for network security reasons and it should only be used as a temporary test configuration 6 3 2 Port forwarding This solution exposes less directly the unit to external attacks Howev
47. n at the cost of a high latency On a LAN and or private network with a controlled quality the HIGH quality setting is recommended as it yields minimum latency 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS On the contrary it should be avoided for a link via the Internet as it can only tolerate a low jitter One solution can be to start with a MIDDLE setting and switch to the LOW setting if too much audio disturbance is heard 4 6 5 Links with IP phones SCOOP 4 is compatible with IP phones that use the SIP protocol many on the market do The algorithm used in this case is G711 but a few IP phones can also accept G722 Note that IP phones include software SIP phones implemented on computers 4 6 6 Notes about the keypad e Use the up arrow key to switch between low case and capital letters e Once a number or SIP URI has been called it is easy to recall it without having to type it again press the green phone key then you can scroll through the history last dialled numbers using the arrows Press the phone key when the desired number is displayed This is especially useful for quickly redialling the previous number or URI 4 7 Setting up a link in ISDN mode 4 7 1 Preliminary setup The network interface must be configured depending on the local ISDN line that is used Protocol First the protocol should be set appropriately SETUP Net Param P
48. network interface Ethernet IP leased line or ISDN interface parameters etc e Parameters of the keyboard display interface as an example selection of the language for the display messages Chapter 4 Detailed operating mode describes these two last categories The parameters dealing with the audio interfaces are programmable independently from the others On the other hand the auxiliary functions depend on the current transmission mode and coding type The following table is a summary for each coding type of the allowed values for the various parameters of the coding configuration and auxiliary functions Meaning of abbreviations in the table e Channel mode M Mono S Stereo JS Joint stereo DM Dual Mono e Coding H221 H221 synchronisation SRT Statistical Recovery Timing e X function available not available with this type of coding e FEC Forward Error Correction Reed Solomon error correction Only MPEG can be configured with all three auxiliary functions data auxiliary audio relays For other algorithms each function when available can only be used alone Auxiliary functions are only available for codec 1 when in double codec configuration The auxiliary functions are currently only available in leased line mode 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS e Coding Bandwidth Bitrate FEC Data frequency mode channel Audio kHz f MPEG Layer
49. om the audio interfaces analogue or digital sample rate conversion is fulfilled whenever needed to get audio data at the coding frequency F which is depending on the coding type 16 24 32 or 48 kHz The coding clock is also locked to the internal clock 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 2 2 Encoding and decoding In the dual 7 kHz codec mode over leased lines each codec uses the ITU T G722 algorithm running in mono at a 64 kbit s rate In the normal single codec mode the codec readily includes a wide range of coding algorithms First one can select among algorithms compliant with ISO and ITU T recommendations e G711 IP or ISDN mode only e ITU T G722 mono at 64 kbit s e MPEG Audio Layer II at 48 32 24 or 16 kHz with programmable channel mode and bit rate Besides other algorithms are available that are so called proprietary because they do not comply with enforced standards e CELP running in mono at a net 24 kbit s bit rate and providing a 7 kHz bandwidth only used in IP mode e 4SB ADPCM running either in mono at a 128 kbit s bit rate or in stereo at 256 kbit s the bandwidth with this algorithm is 15 kHz e TDAC mono running at 64 kbit s with a 15 kHz bandwidth available as an option in ISDN mode The following describes some important features of the various available algorithms and protocols 2 2 1 Notes about G711 G711 is the standard coding used
50. or leased line transmission neither for IP transmission because a single data stream is transmitted For these reasons only one MPEG format is defined for non ISDN transmission there is no distinction in these modes between J52 compliant or non compliant format 2 2 5 Notes about TDAC As an option the codec can also include the TDAC algorithm TDAC is for Time Domain Aliasing Cancellation this is a transform coding based on an MDCT Modified Discrete Cosine Transform encoding a 15 kHz bandwidth mono signal at a 64 kbit s bit rate Some specific product versions also include asymmetric modes e G722 TDAC G722 encoding TDAC decoding running both in mono at 64 kbit s e TDAC G722 TDAC encoding G722 decoding with SRT running both in mono at 64 kbit s this mode is symmetric to the previous one 2 2 6 Symmetric or asymmetric codec modes The codec allows two communication modes Symmetric communication in this mode the encoder and decoder both use the same coding algorithm with the same configuration channel mode etc In this case the communication is strictly symmetric full duplex with exactly the same coding configuration used in both directions local to remote and remote to local This is usually required when using proprietary algorithms 1 J52 is only relevant for ISDN connections 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS Asymmetric communication this mode is used for
51. ositive then you can proceed with the rest 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 3 5 2 Use of the embedded html server From a computer connected to the same network open an html browser window and enter the IP address of the SCOOP 4 in the address or URL field This gives access to the html server that is embedded in the SCOOP 4 The page typically looks like the following picture Eoee J i SCOOP 4 IP Configuration AETA AUDIO SYSTEMS gt General configuration Codec mode SIP Multicast send Multicast receive Language English SAVE MODE REFRESH SIP Line Registering User Display name Registrar Authentication User Authentication Password Registration Status not registered NAT Firewall traversal Outbound proxy E STUN server STUN mode off si SAVE SIP REFRESH v an If you click Network on the left you can get a display of the IP addressing data It is possible to change settings and click the SAVE button to write them into the SCOOP 4 REFRESH reloads the page from the unit to update the display The network settings can be updated from this page but e Obviously it is not usually possible to do the initial setting in this way e Be careful before changing these settings as a wrong setting here can make you loose control over the unit In such event go back to 3
52. rotocol The default setting is Euro ISDN also known as ETSI protocol Change this setting if another protocol is needed in your location Local address In some cases it may be necessary to set the local address or local ISDN number of the line and or it is possible to assign a sub address to the codec The local number allows multiple subscriber numbering or MSN This number is usually the number remote equipment must dial to call your equipment Configuring this number in the equipment is not mandatory if the equipment is directly connected to the public network On the other hand if the equipment is connected to a PABX the number s are often required The PABX may also impose a unique number for each B channel within the same BRI interface In such a case refer to the characteristics and configuration of the PABX Proper configuration of the local numbers is essential and many problems in setting up links originate from mistakes or misunderstandings regarding this configuration In doubt leave this number blank This is usually appropriate for public lines Sub address SA This number differentiates several terminals connected to the same ISDN bus which are allocated the same call number s Thus it can be useful in case other devices are connected with the Scoop 4 on the same line Whenever a sub address is set the unit will only accept incoming calls specifically directed to this sub address Most often
53. s less than 1 ms 5 2 4 Idle channel noise Background noise is measured with no audio modulation idle channel with maximum input and output level set at 16 dBu through the whole encoder decoder chain wide band coding with 48 or 32 kHz coding frequency Maximum noise level 56 dBm quasi peak detection CCIR weighting or 62 dBqOps This result in a signal to noise ratio SNR of more than 72 dB When the maximum input and output level is set at another level both the signal and noise levels are shifted but the SNR remains in the same range 5 2 5 Total distortion vs frequency and level Total distortion relative to maximum level or THD N is less than 82 dB over the whole audio bandwidth 20 20 000 Hz This performance holds for audio signals from 80 dB to 1 dB relative to the maximum level 16 dBu 5 2 6 Crosstalk Crosstalk is less than 80 dB over the whole bandwidth 10 Worst case for all types of algorithms MPEG performs better than the others SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 5 2 7 Gain and phase difference between channels The gain difference between channels is less than 0 3 dB over the whole bandwidth for any sampling frequency The phase difference between channels is less than 3 degrees over the whole bandwidth for any sampling frequency 5 3 Power supply The codec operates from mains 85 263 Vac 47 63 Hz Protection is provid
54. s long as it is still connected to a DHCP server SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS Static IP configuration When there is no DHCP server you have to enter the settings manually using the menu TOOLS Maintenance Ethernet Setup Manual etc The IP address must be free i e not already assigned to other equipment Ask support from the network administrator s as needed The following has to be entered IP address Must be unique on the network A typical value is 255 255 255 0 All addresses are in the form n p q r Examples 192 168 0 12 10 0 54 123 Note in contrast to the configuration with DHCP the static setting has to be reviewed each time you move the unit to a new physical site network as the previous IP addressing is probably not valid for the new location Checking the IP configuration The above configuration is kept in the unit s memory and reloaded at each start It is recommended to restart the unit right after the initial setting to ensure that everything is OK To check the setting you can read the IP address in the About menu TOOLS Maintenance About You can then also check that the unit is seen on the network and at the right address from a computer connected to the same network enter in the command mode or console mode depending on the OS ping ipaddr where ipaddr is the IP address of the SCOOP 4 If the response is p
55. so it hardly impacts the audio quality Although J52 does not apply to leased line connections this error protection technique is also implemented in the SCOOP 4 in leased line mode 6 1 3 H221 framing H221 defines a framing structure that allows byte synchronisation recovery in leased lines and the transmission of control data along with the main data 6 1 4 Proprietary coding algorithms The proprietary coding algorithms are algorithms which are not standardised by the ITU T but have distinctive features that make them useful for some applications e Low coding decoding delay 4SB ADPCM e Low bit rate wide band speech coding CELP e TDAC Time Domain Aliasing Cancellation MDCT based algorithm SCOOP 4 User manual 55 000 053 C LAAS AETA AUDIO SYSTEMS 6 2 Overview of the SIP protocol 6 2 1 What is SIP SIP is for Session Initiation Protocol a protocol specified by the IETF for establishing media transmission sessions SIP is considered the communication protocol of the future by most vendors and as such it has deep influence on the VoIP applications As a signalling protocol SIP brings methods and techniques to solve the issues related to the establishing of an audio link Almost as important it is a recognised standard implemented on many network devices and systems Using SIP helps you build modular and really evolutive systems not being tied to a single vendor 6 2 2 Setting a link with SIP Let us
56. ssssssssessisesisssssesieseisssssssirssisesisasisssiessisssseseassstessis 27 A A EE 28 4 5 Handling the configuration profles 33 Ger Setting up a link in IP mode escrase eege eege 33 Aj Setting up a link in ISDN mode ageschat 34 4 8 Erasing and resetting the confgeuraton es 35 S Technical CHAN TE ET 36 31e Characteristics Or e 36 EE 42 33 OW SE SY rsin ra NN NO 43 5 4 RETTEN 43 EE character CS arrere rre EE A E EEA EEA EE 43 Lo Ee E Re EE 43 5 7 Accessories and related e een e CN 43 O A oascsscesscssceascatsecscacccseccainsseussosaaeasaabsacsctesesesvecstsuuecossasossateessascosseccecstssuecossasoesatectsesai 44 6 1 Complements on the algorithms and protocols used ccccceeeeessesssssseeesssesssssssssseesseeseeeeens 44 6 2 Overview OF the e sercis ERE oneesacemdastede 45 6 3 Some methods to deal with NAT routers and Drewalls 47 EE TR E 48 Ga E E ACS LE ON EE 50 55 000 053 C SCOOP 4 User manual WEN LAAS AETA AUDIO SYSTEMS 1 General The SCOOP 4 codec allows the bi directional transmission of one or two audio signals with bit rate reduction over digital leased lines ISDN lines or IP protocol networks The codec is available with the following main product versions e SCOOP 4 LL with digital leased line interfaces and an Ethernet interface for IP transmission e SCOOP 4 ISDN 2B with digital leased line interfaces Ethernet interface and an ISDN interface The following table shows the main feat
57. stereo jack The headphone volume is adjustable thanks to a potentiometer and the source select key toggles the listening between transmission Tx indicator or reception Rx indicator Actions dealing with this area connecting or disconnecting the jack Tx Rx selection volume adjustment never affect the transmitted or received signals SCOOP 4 User manual 55 000 053 C AETA AUDIO SYSTEMS yoel SL EY bletz OLUDIOA uoydpe H uoydpe H BULOWUOW 348 19p09 p oipne D nen s y uonebiAeN 4OOUUN ka y 4x9 z fae Nr te S D e 5 a gt I S o Laag GD dn Buey a O ege 21NOS BuLOWUOW IA kay sg z uoydpe H J9poous olpne paj iwsued ave e CG HO UO oe fea 55 000 053 C LAAS AETA AUDIO SYSTEMS 3 2 2 Rear panel All connections are done on the rear panel of the codec The characteristics of the interfaces and layout of the sockets are detailed in chapter 5 1 Characteristics of interfaces The following elements are available on the rear panel refer to following Figure 3 Rear panel Mains power socket This is an IEC type power socket Audio inputs outputs e Analog inputs outputs at the input plug the audio cables into the female XLR sockets At the output plug the audio cables into the male XLR sockets In mono mode only A channel is used e Digital inputs outputs a digital input mono or stereo in AES EBU format or SPDIF can be
58. t the codec configuration see chapter 3 3 Equipment configuration parameters p 17 and chapter 4 Detailed operating mode The setup of the Ethernet interface is described in 3 5 below Initial setup of the Ethernet interface 3 4 3 Notes about the use of AES EBU interfaces When using digital audio interfaces it must be decided whether the codec is master or slave regarding audio sampling clock synchronisation In the first case the codec derives the sampling clock from the network clock or an internal source and the device s connected to the codec must synchronise to the same clock source The most common choice is rather the slave mode to be used when it is not possible or not desired to synchronise the external equipment onto the clock of the transmission link or the codec In this case the AES EBU interfaces should be set in the so called genlock mode When in this mode the codec derives the sampling clock of the digital audio interfaces from its AES input in other terms is gen locked onto the incoming AES signal and sampling rate conversion SRC is used for interfacing to the coding parts It is mandatory in such situation to provide the codec input with an AES signal featuring the same sampling frequency as the external equipment even if the codec is used only as a decoder If this requirement is ignored the unit will actually fall back to master mode In such situation clicks in the
59. ter the password 1 to 8 numbers and the unit is unlocked as soon as the last digit is entered On factory setting or after erasure of the unit memory the password is blank so this step is skipped 4 3 Description of the keyboard Please refer to the description in 3 2 1 above Front panel LCD and basic control keypad 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 4 4 Description of the menus The unit features a tree structured menu and the three function keys on the bottom of the LCD are used to navigate through the menus The OK key is used to confirm some settings or enter data and the Esc key allows to go back to the upper menu level Pressing this key several times makes sure you come back to the main default menu From the top menu you can directly enter one of the three main menus by hitting the function key just beyond e TOOLS maintenance and housekeeping functions and access to status information e DIR access to the directory IP mode only e SETUP configuration of the codec This SETUP menu is itself divided into three sub menus e Net selection and configuration of network interface and parameters e Audio configuration of audio interfaces and parameters e Cod selection and configuration of the coding algorithm The following diagrams show the various sub menus and accessible parameters Note that the character in these diagrams shows the default and or factory reset valu
60. ts decimal value The message meaning is given for an ETSI ISDN Causes with values greater than 80 hex are generated internally unallocated unassigned number 02 2 no route to specified transit network normal call clearing user busy no user responding call rejected number changed non selected user clearing a wh 0 gt VINIR Z mmh wh mb 1 mM CH Wl INI O SNe S N N destination out of order invalid number format facility rejected facility rejected 8 network outoforder SS 1 temporary failure o y O 2 switching equipment congestion INQ NO NO OION GC So N gt RIK 3 access information discarded access information discarded o 2F 47 42 66 channel type not implemented 5 69 requested facility not implemented 6 70 ee 7 SCC Nig er Les Cate Lee 1 4 4 only restricted digital information bearer capability is available 4F 1 55 85 9 service or option not implemented unspecified SCOOP 4 User manual 55 000 053 C Casts AETA AUDIO SYSTEMS incompatible destination invalid transit network selection 60 96 message not compatible with call state or message type non existent or not implemented call clearing unspecified 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS 6 5 V35 interface adaptation This annex indicates the proper connections to us
61. ures of the product Functions marked with in this table are available as options Functions marked with O are only available in the version equipped with the ISDN interface One outstanding feature of AAS codecs in ISDN mode is the 5A System on receiving an incoming ISDN call the unit can automatically detect the coding algorithm and parameters of the calling codec and then adjust itself in a compatible configuration so that the connection succeeds regardless of the initial configuration and that of the remote unit In IP mode the codec features the same ease of operation thanks to the use of the SIP protocol The standard operation mode is the single codec mode where the unit can be connected to a remote codec using any one of the listed coding algorithms In the dual 7 kHz codec mode available for leased line transmission the equipment is equivalent to two independent mono codecs each running G722 over a 64 kbit s leased lines 5AS Aeta Audio Advanced Automatic Adjustment System 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS Characteristics Optional Operation modes Single wide band codec Dual 7 kHz codec LL mode only IP transmission interface Ethernet interface 10BaseT 100BaseT TCP IP or UDP IP protocol SIP signalling protocol Leased line transmission interfaces Two X24 X21 V11 V35 interfaces 64 128 192 256 or 384 kbit s over one line or 2x64 kbit s over two lines
62. wing is like the initiation of a phone call the IP codec rings if it accepts the call this is notified to the Scoopy At this stage the proxy s provide the Scoopy and the IP codec with all the address data they need for the link then the actual audio streams can be exchanged between both units As a very important feature the end devices now can exchange data directly the proxys do not have to be on the path they are only involved in the setting and later the ending of the session The codecs will automatically exchange their coding capabilities and agree on a coding mode with no further user intervention Alternatively the call can be done from the station to the reporter in a way very similar to the above In contrast with ISDN links the operators at the station do not even need to know where the reporter is located This is because the registrar deals with this issue Note that it 1s also possible to set a link with a SIP compliant VoIP phone instead of another codec This is one of the numerous advantages of using a standard 11 Scoopy is a portable audio codec from AETA AUDIO SYSTEMS the description here applies to both Scoopy and the Scoop 4 as they are both SIP compliant and mutually compatible 55 000 053 C SCOOP 4 User manual LAAS AETA AUDIO SYSTEMS GF IP phone S I 7 SIP proxy server Gateway 9 W SIP IP codec Bes registrar with Et

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