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1. ADN HIFISCOOP 3 5ASystem Audio codec for transmission over the ISDN or leased lines User Manual AETA AUDIO 361 avenue du G n ral de Gaulle 92140 Clamart FRANCE T l 33 0 1 41361212 Fax 33 0 1 41361213 Telex 631178 Web http www aetausa com 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Bs HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 1 General The HIFISCOOP 3 5ASystem codec allows the bi directional transmission of one or two audio signals with bit rate reduction over ISDN lines or digital leased lines The HIFISCOOP 3 5ASystem is available in three versions e HIFISCOOP 3 5AS 2B with one ISDN interface e HIFISCOOP 3 5AS 4B with two ISDN interfaces e HIFISCOOP 3 5AS 6B with three ISDN interfaces The following table shows the main features of the product Functions marked with in this table are available as options One outstanding feature of the HIFISCOOP 3 codec 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
2. er ris Level C86 E eee m Desa i E 3 masr 1 2 e s 2E JH x E r R3 es e LL D mE 1 amp e 75 ere ev ci oz JC E Li ove s ns esa J ml A 1sa dert 62xW ud 3 cus c XH a ci re es 2 m ea den EA il Te ETER carg Eton pui c5 Figure 6 Audio board configuration 22 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 3 5 3 Analysis of malfunctions The following table indicates the detected alarm conditions and their classification Alarm condition Major internal Major external Power or fuse fault Bad start up of microprocessors ISDN X interface fault detected on start up Overload on an audio input Coding configuration different from X expected or initially programmed fallback of encoder or decoder Table 3 List and classification of alarm conditions Excluding the case when an internal failure disables the management micro controller messages are displayed to indicate the anomaly or the
3. This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 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 optional Ethernet interface As a general rule the configuration parameters are saved in non volatile memory and restored at power 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 equipped with the TeleScoop M configuration and monitoring software This optional 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 For controlling connections in ISDN mode it is also possible to use the Loop control function When this special connection mode is selected one can trigger a call by activating an input current loop optically i
4. 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 mono running at 64 kbit s with a 15 kHz bandwidth available as an option The following describes some important features of the various available algorithms and protocols 2 2 1 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 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 co
5. 1 selection from the local and sub address has much importance in the specific case of the double codec mode where the unit behaves as two devices connected to the same SO line In this mode the two possible links use the two B channels of the SO port 1 so the LN SA pairs should preferably be different in order to discriminate a call to codec 1 or 2 e Either the LN is unique for each codec LNI is different from and the rules in the table above in a apply e Either the LN is the same for the two codecs and a unique SA is set for each codec SAT different from SA2 then a call received with a SA is accepted only by the codec whose SA matches the received SA e Last if the LN is the same for both codecs and the SA cannot discriminate the call e g no SA is specified with the incoming call then the call is accepted by codec 1 if it is not busy on line else by codec 2 if it is available Note 2 if a Proprietary sub address filtering was selected see 4 4 71 Network Parameters Menu a received call is accepted only if a SA is indicated and it is the same as the codec SA 1 Note that as a consequence if the local number is wrong incoming calls get no answer 2 Possible if not mandatory for certain PABXs 3 This is true for direct connection to the public network 50 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without au
6. 3 5ASystem User Manual 51 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Unsuccessful calls If the communication has failed the display indicates the cause NT fail level 1 Physical fault on the network access connection problem Disconnected lin The SO interface is not connected Call restriction Call restriction from the network or PABX e g outgoing call through a PABX with no local number configured while the PABX requires one No user response The remote terminal did not unhook Outgoing call to a remote number which is not assigned Inv numb format Outgoing call to an invalid number 4 6 3 Incoming call Introduction Principle of number matching for incoming calls see sub chapter Incoming calls acceptance p 49 Signalling of incoming call When the equipment is presented an incoming call this call is automatically processed and it is announced on the display in the first item of the main menu Moreover a beep is produced by the buzzer on reception of an incoming call When the unit is in manual answering mode the incoming call is not directly accepted Rather it is announced on the display and with an audible signal and the user can accept it OK key or reject it ESC key 4 6 4 Releasing the line When communication is running the line can be released either locally user action or vi
7. ISDN line is idle the unit will simulate a connection whenever it is asked to connect 46 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 5 Handling the configuration profiles 4 5 1 Memorised parameters When configuring the equipment the number of parameters to program can be rather high This is why the editable parameters described in the previous chapters are saved in non volatile memory and restored at power on Moreover thanks to the configuration memories it is possible to save various specific configurations and then recover them easily by simply recalling a memory number There are fifty configuration memories numbered from 1 to 50 The parameters saved in each memory are the following e Main transmission mode ISDN or LL mode e Coding mode with all coding configuration parameters those editable in the CODING CFG menu Possible activation of the data channel and configuration of this channel Possible activation of the relay transmission function Possible activation of the audio coordination channel Remote ISDN numbers and sub addresses depending on the Dial numbers parameters in the Network parameters menu Of course this is only relevant with ISDN transmission Concerning the remote ISDN numbers
8. Supervision Interface lt gt Audio 44 Conversion Decoding outputs Man machine interface Figure 1 Functional diagram of equipment The audio signals to be transmitted are converted to digital format then the encoding function reduces the bit rate using a selectable algorithm the resulting bit flow is sent to the transmission network via SO BRI interfaces or permanent link data interfaces X21 X24 V35 The transmission interface module also extracts compressed data coming from the network and sends them to a decoding module that reproduces uncompressed audio data Last the audio signals are output after digital to analogue conversion 2 1 Conversion of audio signals The analogue inputs and outputs are transformer isolated and the input and output gains are adjustable The sampling frequency of the analogue lt digital converters is 48 kHz or 32 kHz depending on the operating mode As an option the equipment can also accept digital audio inputs outputs in AES EBU format The digital inputs outputs are used in place of the analogue inputs outputs whenever the codec is configured for digital audio mode The digital audio interfaces can be synchronised or not to the internal clock reference of the codec which itself is derived from the network clock recovered by the transmission interface Having the digital samples from the audio interfaces analogue or digit
9. by pressing the arrows LOOP CONTROL Off On Optional activation of the loop control mode ANSWER MODE COD1 Auto answer Manual answer ANSWER MODE COD2 Auto answer Manual answer For codec 2 proposed only in case of dual codec configuration CALL SHORTCUTS On keys 1 amp 2 On 1 amp 2 w o PWD Disabled Actually keys 0 land2 __ INC CALL TYPE Data calls All inc calls Phone calls Type of incoming calls accepted SA FILTER Standard Proprietary Optional sub address filtering DIAL NUMBERS 1 global set 1 set per memory Management of the remote numbers in profiles HLC ENCODING Yes No recommended In LL mode after passing the first choice just confirming with OK the current LL mode the programming sequence is as follows Display top line Proposed values Remarks I DSR Normal Clock source selection 1 Forced Dual codec mode only 2 Forced LOOP CONTROL Off Optional activation of the loop On control mode 1 Note that this choice is not presented if the optional LL mode is not available 38 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON The following describes some details on the above parameters SA System This paramete
10. channel output Coordination channel output Coordination channel input Coordination channel input Frame ground 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 65 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 5AS Manual Ed C doc 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 For 48 kHz For F 32 kHz Frequency range Hz Tolerance Frequency range Hz Tolerance dB dB For F 24 kHz For 16 kHz Frequency range Hz Tolerance Frequency range Hz Tolerance dB dB Saas xm eem 5 2 3 Group delay distortion Taking the m
11. connect or try to reconnect after a line loss After trying this number of times if it has not succeeded in re establishing the link the unit definitively gives up Of course this parameter only makes sense if auto redial is active Time before redial This parameter is the time period in seconds that the unit waits after a failed trial before redialling Note that a pending redial is definitively cancelled in case another call outgoing or incoming call is processed by the codec during this time period During this waiting time before redialling the OK status line becomes OK Auto redial or as a reminder This parameter also applies to redialling when controlling outgoing calls with the loop control function see below Loop control for ISDN mode This parameter is the possible activation of the loop control function In normal mode outgoing calls are sent or released using the menus and or the remote control interface When loop control is selected outgoing calls are controlled by activating or not optically isolated input loops One loop is available for each codec when in double codec mode When the input loop is activated i e current is flowing the corresponding codec establishes a link by calling the number s programmed in the Outgoing Call Configuration menu When the loop is de activated the codec releases the line and stays idle as long as the loop is not ac
12. display During a link it is possible from the main menu root to display possible errors as well as the status of the codec after it has negotiated its configuration with the remote equipment ISDN mode when G7xx or J52 is used In order to enter this secondary menu directly type OK from the main menu root Access to information about the encoder s and decoder s is only possible if the concerned codec is on ISDN communication Information on the second codec is only possible when in double codec mode NO ALARM FUSE FAILURE DOWNLOAD FAILURE LEFT DECO FAULT RIGHT DECO FAULT INPUT OVERLOAD AES INPUT FAULT CONF COD 1 FAIL CONF COD 2 FAIL SAMPL RATE ERR CODER 1 FALLBACK ALARM NO ALARM Back to main DECOD 1 FALLBACK menu X 1 Codecl CODER 2 FALLBACK DECOD 2 FALLBACK CLOCK 1 CLOCK2 ENCODER X Back to LAYER2 MONO main OK menu lt gt ENCODER X 128 KB s 2B Only in J52 mode only during ISDN communication Back to main menu DECODER X 128 KB s 2B Only in J52 mode DECODER X MODE 1 If X 1 and CODEC 2 on line With X 2 Back to Codec 2 main menu 32 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 4 3 Communication menu ISDN mode only This menu is used to make outgoing call
13. fault can be searched using the menu In case of an internal alarm especially check the power supply indicators If the LCD display is blank and no LED on the unit is lit check the fuses T 2A that are in the mains socket block fuse housing between mains socket and power switch then if necessary check the fuse soldered in the power supply module Unplug the mains before such tests The test loops accessible from the TESTS menu can help improve the analysis of a problem In order to check if the audio part functions correctly use the AD DA 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 is present at the output Loop2 sends back to the remote codec the compressed data received from the network see p 8 This way it is possible to test the integrity of the transmitted data and or check that the remote codec works properly The Audio out to Audio in loop Audio loop can be used for overall functional check and also for aligning the overall chain 1 Fault of the network clock source currently used for synchronisation ISDN or X21 X24 port 1 or port 2 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 23 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C
14. itself in a compatible configuration so that the connection succeeds regardless of the initial configuration and that of the remote unit 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 the equipment is equivalent to two independent mono codecs running G711 or G722 Each mono codec can transmit independently from the activity of the other codec over a B channel from the first ISDN interface Alternatively the unit can operate as two G722 codecs connected to two 64 kbit s leased lines 5AS Aeta Audio Advanced Automatic Adjustment System 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 1 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Characteristics Optional Operation modes Single wide band codec Dual 7 kHz codec ISDN transmission interfaces 2B version one SO or S T interface 4B version two SO interfaces 6B version three SO interfaces U interfaces available for North America 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 Audio coding algorithms audio modes G711 standard telephone Mono G722 Mono MPEG Audio Layer II M DM S JS MPEG Audio L
15. maintenance For normal operation none must be set or they must be set in position 1 2 jumper towards front of the board cies cw C169 R 5 Front of the board Setting a jumper in 2 3 position activates a test loop leftmost when looking from the front of the unit AD DA or AES loop e TB10 loop before codec at the coding frequency e TB11 codec loop after coding but before network interface equivalent to loop 3 No jumper must be set on other pins TBxx not referenced in the above list 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 21 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 77 i ern 1 rio TB8 a evr esr T ES re ee 83 rue fens cb rw Tein m 1 y 9 CBB TB 13 cnz 112 em enr 210 x E 2 cvs 7 3 3j T 31 C118 er i H c errs eve 8 81 ew mw cin cim ee rie ver e Td d ew 8 ow 4 f m s La rr ded 225028 rd TRNTENTI ra xI 1 za oun LI ea z 1 z 2 r1 cme 3 oad ta ol ramara alata LL spl ere eae Q T o cim DS m rp
16. the behaviour depends on the user s choice see NETWORK PARAM menu item DIAL NUMBERS If the 1 global set option was selected these numbers not saved in the configuration profiles If the 1 set per memory option was selected then one unique set of numbers is saved with each profile The other parameters are not affected by a memory recall network parameters local ISDN numbers SYSTEM SECURITY parameters alarm enabling audio I O configuration language of menus and ISDN protocol 4 5 2 Using the profiles Alternatively it is possible to recall quickly a profile when the unit is in the main menu root You can go back to the root at any time by pressing ESC twice On pressing the key the profile select message is displayed PROF 1 RECALL NAME 1 is the current name of profile number 1 At this time use the arrow keys and then OK when the desired profile number and name is displayed Alternatively you can enter the profile number then OK A message shortly warns that the profile is being recalled and the equipment starts again with the new profile parameters 1 Except for test loops 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 47 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 5 3 Profile names Each profile has a label or nam
17. which the network provides on presenting a call matches the local configuration of the equipment local number and local sub address 1 In addition some PABXs might take them into account for accepting or not outgoing calls 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 49 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc The following tables sum up the equipment behaviour It carries out tests in following order a Selection from the local number LN CSDL With NUMBER Without NUMBER Equipment With LN ACCEPTABLE IF MATCH note ES Note match means e Ifthe received call includes fewer digits then the local number includes there may be a match The equipment compares the received digits with the last digits in the configured LN There must be equality on all received digits to declare a match e If the received call includes more digits then the local number includes there may be a match The equipment compares the configured LN with the last digits in the received digits There must be equality on all the local number digits to declare a match Example presented NUMBER 0123456789 and LN 6789 match call is acceptable b In case the call is accepted after this first step selection from the sub address SA CALL With SA Without SA Equipment With SA ACCEPTED IF EQUAL ACCEPTED Note
18. with the audio interfaces are programmable independently from the others On the other hand the auxiliary functions depend on the current 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 Channel mode M Mono S Stereo JS Joint stereo DM Dual Mono Bitrate 2 64 transmission over 2 independent B channels 64 kbit s each dual codec mode e Coding H242 H242 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 with J52 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 16 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Coding frequency 7 to 20 MPEG Layer II depends m J52 Fe 15 to 20 depending on MPEG Layer III 152 Fe 7 to 20 MPEG Layer depending on Proprietary TDAC G722 asymmetric Table 2 Possible v
19. work only if communication is running They are not disabled when communication is started or stopped Loop 2 and loop 3 should not be used in asymmetrical coding mode where coding and decoding algorithms are different 4 4 14 Profiles Menu This menu is used for handling the configuration memories From the PROFILES item in the main menu after entering with OK two options are proposed e RECALL recall a profile this option is always presented first e STORE store the current parameters in a profile When displaying the desired function Recall or store type OK then select the desired profile number and name either use the arrow keys to scroll through the profiles the number and the name of the profile are displayed on the screen or directly enter the profile number from 1 to 50 Then type OK when the desired profile is reached A message shortly warns that the profile is being recalled stored and the equipment starts again if recalling a profile with the new memory parameters Remember you can quickly reach the Profiles menu from the root by depressing once the left arrow key or from any position in the menu ESC twice and left arrow once Also from the root you can quickly reach the Profiles Recall item by pressing the key Refer to the following chapter for a detailed description of the configuration profiles and their handling 1 However if loop 3 is activated while the
20. 0 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 6 3 2 Transmitter side On the transmitter side when the studio side switches to the backup configuration the codec will automatically switchover thanks to the following process When the codec is operating in LL mode on receiving a call from the ISDN interface the codec switches to the ISDN mode if the ISDN interface is set for automatic answering Then the call is answered and the connection is established with the remote codec Later when the ISDN connection is released by the calling party here the studio side the codec switches back to LL mode and normal operation is resumed Note If the ISDN interface is set for manual answering the codec first presents the user the call before switching to the LL mode the unit remains in LL mode until the user accepts the call The remote codec typically gives up after a time out duration in case no answer is given Note that manual answering is one way of disabling the automatic back up capability but the simplest and safest one is just to disconnect the ISDN lines from the unit 6 3 3 Notes regarding the automatic switchover Remember that when switching from LL to ISDN mode a separate set of parameters is recalled As a consequence the coding configuration can be made if desired totally
21. 5 mm stereo jack The headphone volume is adjustable thanks to a potentiometer The signal listened comes from either transmission or reception depending on the Tx Rx switch position Actions dealing with this area connecting or disconnecting the jack Tx Rx selection volume adjustment never affect the transmitted or received signals 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 cee cn ana cea min im m mim d 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 including a power switch and one or two fuses depending on the version Audio inputs outputs a When using analogue 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 A channel only is used b When using digital inputs outputs For this mode the same sockets are used as before XLR sockets input A and resp output A are used for a digital input mono or stereo in AES EBU format and resp a digital output in AES EBU format The XLR B sockets are not used Network SO S T sockets Three RJ45 sockets allow the connection to the ISDN Their layout is standard The sockets must be used according to th
22. 722 SRT G722 H242 CHANNEL MODE STEREO 64 kbit s 1B 56 kbit s 1B depending on coding and mode BIT RATE 192 kbit s 3B Back to main menu CODEC TYPE DOUBLE G7xx CODEC 1 ALGO G722 H242 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 35 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Notes CODEC TYPE in the Double G7xx mode the HIFISCOOP 3 5ASystem behaves as two independent codecs two independent links while e g dual mono MPEG encodes both channels in the same frames and within the same transmission link each with G71 Hor G722 coding in full duplex In the normal mode the unit is a single codec but possibly with two audio channels CODING ALGORITHM the desired coding algorithm is selected in this list Note that for J52 compatible choices MPEG J52 Layer II or or G722 with H242 the selected algorithm is an initial setting After the automatic negotiation with the remote codec when establishing the link the encoder may have to fallback to another algorithm e g it may switch from MPEG to G722 H242 if the remote codec appears to be a G722 only codec and the decoder may fallback to another algorithm if the remote encoder decides to use another algorithm than initially configured P MPEG is n
23. AS equipped with one SO interface 2 B channels e HIFISCOOP 3 5AS equipped with two SO interfaces 4 B channels e HIFISCOOP 3 5AS equipped with three SO interfaces 6 B channels U interfaces are available for use in North America Besides certain functions are available as options Leased line transmission interfaces X24 X21 V11 V35 e AES EBU audio interfaces e Addition of TDAC coding algorithm Audio coordination channel Ethernet remote control interface e Isolated power supply for the control loops e 55 extended temperature range with fan On request it is possible to upgrade a codec from one version to another one or for adding an option the unit must come back to the factory or distributor for the change 5 7 Accessories and related products The HIFISCOOP 3 5ASystem is delivered with a mains cord and SO cords 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 HIFISCOOP 3 5AS units from a PC the TeleScoop M supervision software is available separately 68 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 6 Annexes 6 1 Complements o
24. ENU OK Incoming call is accepted MAIN MENU Chan 1 First channel established MAIN MENU Chan 1 ok MAIN MENU Remote negoc The additional channels are MAIN MENU established one Chan by one All channels are established MAIN MENU WAIT CONF NEGO Network card has received MAIN MENU ESTABL ON yB Local or remote release MAIN MENU RELEASE x y All channels are released MAIN MENU CODEC REL REQ MAIN MENU WAIT CODEC REL The channels are released one by one The negotiated configuration First channel is establishing The two codecs try to agree on a number of additional channels to establish X Number of channels OK Y Total number of channels to get The network card waits the negotiated configuration from the codec LINK ESTABLISHED The network card informs the codec communication is lost The network card waits the codec to stop 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 55 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Outgoing call in double codec mode MAIN MENU OK Outgoing call started by user on codec 1 MAIN MENU s channel is CHA 1 g First channel established MAIN MENU CHA 1 OK No additional channels MAIN MENU needed in double code
25. OCK At start up See below Now PASSWORD ERER Enter a new password or directly OK not to change the password CONFIRM PASSWORD Enter the password again only proposed if the password was changed above BAUD Remote 300 bit s Baud rate of the remote control 1200 bit s serial port 2400 bit s 4800 bit s PARITY Rem None Even Odd NB BITS Rem 8 bits 7 bits NB STOP Rem 1 stop bit 2 stop bits The lock item may be used in order to immediately lock the unit if the password is not blank and come back to the main menu root To do this press an arrow to display Now and then press OK The display comes back to the main menu root and the keyboard operation is only possible after entering the password like just after starting up the unit The other option At start up is always presented first which means that the unit is locked after starting up 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 43 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 4 10 Alarm enabling Menu This menu allows the selection of the enabled alarms i e the alarms that will light on an alarm indicator and close an alarm relay The list here is a non exclusive choice list enabled disabled choice for each alarm Starting from the ALARM ENABLING item in the main menu after OK the display be
26. TA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 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 floating balanced type transformer isolated using 3 pin female XLR sockets Maximum input level adjustable from 0 to 22 dBm 0 3 dB Nominal input impedance 600 Q or 10 internal jumper see 8 5 2 Impedance balance gt 32 dB Common mode rejection ratio gt 60dB 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 floating balanced type transformer isolated 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 100 Q Symmetry gt 60dB Z 150Q 5 1 3 Digital audio input and output These interfaces comply with recommendation AES3 1992 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 5 1 5 S0 sockets Network Three RJ45 female sockets are available for the conne
27. Word Clock frequency Fags Impedance 75 Q Duty cycle 50 AESsyne Synchronisation AES output AES3 format AESsync frequency Fags symmetric 110 Q ol Nowed 1 Unused pins should not be connected to any external signal 62 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 5 1 11 Loop control interface The 25 pin female sub D Aux socket includes isolated current loop inputs and dry contact outputs that can be used to remotely control the calls and indicate the link status e input loops have an effect only if the loop control function is enabled see4 4 7 Network e Activating the input loop 1 triggers an ISDN call on the codec codec 1 only if the unit is configured as a double codec de activating the loop releases the line e Activating the input loop 2 triggers an ISDN call on codec 2 if the unit is configured as a double codec de activating the loop releases the line This loop has no action in single codec mode e Output loop 1 is closed while an ISDN connection is running or while codec 1 is linked if the unit is configured as a double codec e Output loop 2 is closed while an ISDN connection is running on codec 2 if the unit is configured as a double codec The following table shows the wiring of the so
28. a configuration profile is recalled 1 set per memory one set of remote numbers is stored with each configuration profile In this way the destination of a call is changed when recalling a configuration profile Note I In any case there exists just one set of local numbers Note 2 The equipment separately memorises the numbers used for single links Normal single codec and those used for double links Double codec With the 1 global set selection it is normal to have different numbers or to have to modify them when recalling a memory if this implies switching from single to double codec or vice versa HLC encoding This parameter enables or not the encoding of the HLC High Layer Capability in outgoing calls It is recommended not to encode it No this is the default setting However some international calls may mandate the encoding of this parameter Clock source selection LL mode dual codec only In dual codec mode and LL transmission mode the I signal of each X24 X21 interface port can be used as a clock valid indication that the device can use for selecting the right source for synchronisation This is the normal mode Alternatively it is possible to force active either the signal on port 1 1 Forced or on port 2 2 Forced hence not allowing the codec to switch from one source to the other This parameter has no influence in the single codec mode where only port 1 is
29. a the network on the remote operator initiative When using the loop control mode the line is released by de activating the input loop 52 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 6 5 Communication monitoring General When an incoming call arrives or a call is sent the display goes to the main menu root and shows communication monitoring messages In single communication mode the bottom line on the display is used for the communication monitoring MAIN MENU XXXXXXXXXXXXXXXX In double communication mode the first leftmost half of the bottom line on the display is used for the communication monitoring on codec 1 the second first rightmost half of the bottom line is used for the communication monitoring on codec 2 MAIN MENU XXXXXXXX YYYYYYYY XXXXXXXX monitoring of link on codec 1 YYYYYYYY monitoring of link on codec 2 This organisation has no relationship with the temporal order in which the links on codec 1 and codec 2 are established Note that capital letters are used for outgoing calls and small letters for incoming calls The following diagrams show the call process in various cases 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 53 This document is the prop
30. active Loop control for LL mode This parameter is the possible activation of the loop control function as described above for the ISDN mode However when the unit is initially set for LL transmission mode the loop control mode features a slightly different behaviour Whenever the input loop is activated the codec first switches to the ISDN mode and it loads the current coding configuration set for this mode Then it proceeds as for the ISDN mode i e it establishes a link by calling the number s programmed in the Outgoing Call Configuration menu The unit keeps the link with automatic redial if needed as long as the input loop stays active Conversely when the loop is later de activated the codec releases the line then it switches back to the initial LL mode Warning the loop control mode should NOT be used to switch to ISDN mode when the unit is set as a double codec in the ISDN operation In such case please use the menu to switch to the ISDN mode then outgoing calls can be set by loop control if needed 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 41 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 4 8 Local ISDN Configuration Menu ISDN mode only This menu is for the addressing configuration of the equipment itself number and sub address of the ISDN interfaces the codec is
31. al sample rate conversion is fulfilled whenever needed to get audio data at the coding frequency which is depending on the coding type 16 24 32 or 48 kHz The coding clock is also locked to the network clock 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 3 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 2 2 Encoding and decoding In the dual 7 kHz codec mode each codec or audio channel can be encoded using the following algorithms e G711 standard coding for voice transmission on the ISDN e ITU T G722 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 711 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 e MPEG Audio Layer III at 48 or 32 kHz with programmable channel mode and bit rate MPEG Audio and G722 algorithms comply with ITU T J52 recommendation for ISDN transmission Besides other algorithms are available that are so called proprietary because they do not comply with enforced standards Proprietary MPEG Layer II at 64 kbit s or 128 kbit s for compatibility with ISDN codecs that are not compliant with the J52 recommendation
32. alues for configuration parameters When in double codec configuration the data channel or relays is only available for codec 1 in G722 H221 H242 This coding mode is not available in the leased line mode 3 The data channel is unidirectional data are transmitted only with the TDAC encoded audio 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 17 Hifiscoop 3 5AS Manual Ed C doc This document is the property of AETA and can not be duplicated without authorisation September 2002 3 4 Installation and set up 3 4 1 Mounting and connections Natural convection or forced air optional fan cools the equipment Avoid obstructing the openings on the flanges and the rear panel To operate the codec the minimum necessary connections to set up are see details in the rear panel description e Power supply Audio inputs and outputs XLR sockets Network interface SO interface s and or X24 V11 V35 interface s Whenever needed the Alarm socket alarm relay contacts must be connected to an external supervision system 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 ISDN numbers network protocol For using the keyboard a password may have to be entered After factory setting or after total configuration erasure the password is blan
33. ata stream is transmitted For these reasons only one MPEG format is defined for leased line transmission there is no distinction in this mode between J52 compliant or non compliant format 1 J52 is not needed nor applicable to leased line connections 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 5 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 2 2 6 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 When the option is installed three modes are available e mono full duplex running at 64 kbit s with a 15 kHz bandwidth 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 7 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 d
34. auxiliary information is an extension AETA proprietary format to MPEG and J52 However the frame structure remains compliant with these recommendations 6 1 4 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 HIFISCOOP 3 5ASystem e Mode 0 no error correction Reed Solomon coding disabled e Mode 1 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 96 redundancy so called low equal protection e Mode 3 protection of the whole frame high 10 96 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 so it hardly impacts the audio quality However this mode is not defined for Layer III Although J52 does not apply to leased line connections this error protection technique is also implemented in the HIFISCOOP 3 5ASystem in leased line mode 6 1 5 H221 framing H221 defines a framing structure that allows the transmissio
35. ayer M DM S JS 4 sub band ADPCM low delay M S TDAC Mono Available bit rates depending on coding algorithm ISDN transmission 64 128 192 256 320 or 384 kbit s transmitted over 1 2 or 3 SO BRI interfaces 64 kbit s or 128 kbit s on each BRI Leased line transmission 64 128 192 256 or 384 kbit s over one line or 2x64 kbit s over two lines 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 Table 1 Main features of the HIFISCOOP 5ASystem Mono DM Dual Mono S Stereo JS Joint Stereo 2 MPEG Layer III audio coding technology licensed by Fraunhofer IIS 2 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 2 Functions The following synoptic diagram shows the basic functions of the equipment Audio Conversion __ Encoding gt inputs Transmission tori Audio Network Monitoring monitoring
36. be entered first to be allowed to use the shortcuts e On 1 amp 2 w o PWD entering the password is not required for using the shortcuts Disabled the shortcuts are disabled use of the menu is mandatory for setting calls Type of incoming calls accepted These options allow a filtering of the incoming calls e In the default mode all types of incoming calls are accepted e In the Phone calls mode the codec unhooks only if the call is a phone call e In the Data calls mode the codec unhooks only if the call is a data type call this is useful to prevent undesired calls from telephones Sub address filtering e In the standard mode the equipment answers calls in compliance with ISDN standards e In the Proprietary mode the equipment only answers a call that presents a sub address and only if this sub address is identical to that of the equipment To some extent this mode uses the sub address as a password for access to the equipment from the line When using this mode it is mandatory to program local sub addresses for all the B channels 40 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON Management of dial numbers global set a unique global set of remote numbers is used and remote numbers are not changed whenever
37. c NEGO mode MAIN MENU Network card waits negotiated WAI CF configuration from the codec Network card has received the negotiated configuration MAIN MENU ESTABL COMMUNICATION ESTABLISHED Local or remote release MAIN MENU RELEA The channel is released MAIN MENU Network card informs the codec C REL R communication is lost MAIN MENU Network card waits the codec W COD R to stop 56 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 6 6 Auto redial function Outgoing calls may be backed up by using this function When it is active the codec can redial automatically in case a connection fails The redial capability applies in two situations e the initial call fails for any reason e g called party is busy the codec then redials and retries to establish the link The codec can also redial if the link is already established and the link is lost for any reason else than local release e g the remote unit mistakenly dropped the line Note that while auto redial is active an established link can be definitively stopped only by releasing the line on the calling codec side It is possible to program the time period that the unit will wait before redialling after a failed trial and it is also to pr
38. cket for this function m edm 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 isolated power supply option All loops are optically isolated and bi directional free polarity Their characteristics are Input loop control current 6 mA max 20 mA Max allowed voltage drop at input 13V Resistance of input loop 700 Q current limiting series resistor Maximum output current 120 mA Maximum output voltage 350 V peak Resistance of output loop lt 35 9 5 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 isolated power supply is available in the unit as an option this is a floating 5V DC supply with 200 mA capacity which can be used e g to power the input loops or LED indicators connected to the output loops 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 63 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc sub D Aux Socket It includes two isolated oe loop inputs and two dry contact outputs The following table shows the pinout of the socket for this function Lm Rem 13 Output loop n 2 b Output loop n 2 a 12 Output loop n 1 b Output loop n 1 a 11 Inpu
39. comes VALID ALARM L FUSE FAILURE All error types can be scrolled with the arrow keys For each error type the star on the right hand side means the corresponding alarm is enabled Pressing OK disables the alarm pressing OK again enables it back Finish changes either by pressing ESC to cancel all possible changes or by pressing OK when displaying the last item in the list SAVE amp EXIT You can also jump directly to this end of list by pressing the key 4 4 11 Audio I O Menu With this menu it is possible to configure the audio interfaces Starting from the AUDIO I O item in the main menu after entering OK the programming sequence is as follows Parameter displayed Proposed displayed values Remarks top line bottom line AUDIO I O FORMAT Analog AES EBU async AES EBU 32kHz AES EBU 48kHz MAX INPUT LVL From 0 to 22 dBu Change the value by pressing the arrows MAX OUTPUT LVL From 0 to 22 dBu Change the value by pressing the arrows OUTPUT LOAD High Z Output load is high impedance 600 Ohm Output load is 600 Ohm The first item is for the selection of the audio interface format When digital format AES EBU is used The other items are relevant only for analogue format interfaces The maximum level can be programmed separately at the inputs and outputs Please note this is not the normal operating level but the maximum level corresponding to f
40. commendations 1 430 layer 1 1 441 layer 2 1 451 layer 3 It also fulfils control and supervision of the whole unit and interface with the remote control link The front panel features a keyboard and display for the configuration and control of the equipment Indicators and LED are available as well S0x3 X24x2 Audio Mother board TRANSMISSION INTERFACE FRONT PANEL Figure 4 Internal architecture of the HIFISCOOP 3 5ASystem Optional modules not visible on the figure come in addition AES EBU interface module on the Audio board auxiliary audio channel module on the motherboard Also optional a temperature sensing fan which switches on when the temperature increases is mounted on the rear panel behind a lattice 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 19 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 3 5 2 Internal configuration Almost 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 setting jumpers on the boards changes some particular configuration options Access to internal parts of the unit Caution The equipment must be switched off and disconnected from mains before this kind of servicing After havin
41. connected to Each B channel of each SO interface is allocated an ISDN number and possibly a sub address so each SO interface has two numbers Consequently 4 numbers are needed for a 256 kbit s link 6 numbers for a 384 kbit s etc This principle ensures compatibility with PABXs that impose a unique number for each B channel If each SO interface is allocated only one number e g direct connection to the public network this same number will just have to be programmed for each of the two B channels of this interface Starting from the LOCAL ISDN CFG item in the main menu enter OK then enter the numbers in following order validate with OK after each number LOCAL DIAL NB 1 number of B channel 1 of interface SO 1 e OCALSUB ADD 1 sub address of this channel e LOCAL DIAL NB2 number of B channel 2 of interface SO 1 e LOCAL SUB ADD 2 sub address of this channel e LOCAL DIAL NB 3 number of B channel 1 of interface SO 2 e LOCAL SUB ADD 3 sub address of this channel LOCAL DIAL NB 4 number of B channel 2 of interface SO 2 e LOCAL SUB ADD 4 sub address of this channel e LOCAL DIAL NB5 number of B channel 1 of interface SO 3 e LOCAL SUB ADD 5 sub address of this channel e LOCAL DIAL NB 6 number of B channel 2 of interface SO 3 e LOCAL SUB ADD 6 sub address of this channel The above describes the maximum case when six numbers are needed 384 kbit s link in a codec equipped with three SO interfaces In the gene
42. ction to the ISDN They have standard pin out 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 59 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 5 1 6 X24 X21 V11 V35 interfaces The X24 V11 interfaces use two 15 pin male Sub D connectors The following table shows their pinout Frame ground Transmitted data Transmitted data Received data Received data Indication Indication Received clock Received clock Electrical ground When operating with both interfaces dual codec the I signal or DSR may be used by de activating it by the transmission device to signal the codec loss of link in such case the codec will try to lock onto the other 24 11 interface When operating on a single interface the I signal is ignored by the codec The codec does not transmit a C 5 1 7 Alarm contacts This interface is on a 9 pin female Sub D connector on the rear panel whose pinout is detailed in the table hereunder unused pins must stay not connected The alarm relays are Reed relays with 10 VA max power switching capacity the maximum admissible DC current is 1 A m ton O Major alarm contact 1 Major alarm contact 2 Minor alarm contact 2 Minor alarm contact 1 60 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property
43. different in the back up ISDN mode Of course both units should be configured in an adequate configuration for each transmission mode and then each codec can be set in the LL mode to start the normal operation For the ISDN and backup configuration DO NOT set the units in double codec mode Otherwise the automatic switchover will not work properly 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 73 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 6 4 V35 interface adaptation This annex indicates the proper connections to use when interfacing the HIFISCOOP 3 5AS codec to DCE equipment using a V35 interface 6 4 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 G Signal ground B 19 X24 Signal Pin signals direction Data clock Received data Transmitted data Frame ground 6 4 2 Optional connectio
44. doc In leased line mode a clock fault is one typical cause of an external alarm This can be due to complete loss of the X24 V11 interface due to a failure of the transmission line a failure of the transmission device connected to the codec incorrect clock frequency i e incompatible with the codec configuration On the other hand in case of a decoder alarm with no clock error possible causes are e Jack 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 transmission errors causing erratic alarms 24 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 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 16 character lines By means of this interface the user can do the following Set or release an ISDN link Menu COMMUNICATION Enter edit or display ISDN destination numbers and or sub addresses Menu OUTG CALL CFG Select the coding algorithm set its parameters and co
45. e which is displayed when scrolling the profile list After factory set up or after a general reset every profile name is NONAME The profile names can be programmed thanks to Express Profiles a software tool running on a PC running Windows 9x ME NT and connected to the HIFISCOOP 3 5ASystem through a serial port Express Profiles allows the management of the profiles with following capabilities e Each profile can be displayed and edited including the name The profiles edited on the PC can then be downloaded from the PC to the codec e Conversely the profiles in a codec can be uploaded to the PC as well e The profiles can be saved to a file or restored from a file For additional information consult us and or refer to the documentation of Express Profiles 48 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 6 Establishing links This chapter deals with call management in the ISDN transmission mode When in the LL mode the unit is always in the connected status and the link should be operative all the time as soon as the physical connections are established WARNING Priority is granted to the processing of incoming calls If a call is RECEIVED while the user is operating the keyboard and display any cu
46. eft arrow is for erasing the rightmost digits rotates the number to the left and shows the rightmost digits Sub addresses are limited to four digits The use of sub addresses is optional for details refer to 4 6 2 34 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 4 5 Coding configuration Menu This menu is for the detailed configuration of the codec part audio encoding decoding Exiting with ESC cancel brings back to the main menu The following diagram shows the sequence of selection items as well as the available options for each item However the list of options for a given item may be restricted depending on the selected coding algorithm This is detailed in the following notes 6711 6722 SRT 6722 H242 MPEG 2 J52 MPEG Layer3 J52 4SB ADPCM P MPEG NON J52 TDAC G722 TDAC TDAC G722 48 kHz 32 kHz 24 kHz 16 kHz MONO DUAL MONO STEREO JOINT STEREO 64 kbit s 1B 128 kbit s 2B 192 kbit s 3B 256 kbit s 4B 320 kbit s 5B 384 kbit s 6B depending on coding and mode MODE 0 MODE 1 MODE 2 MODE 3 MAIN MENU CODING CFG CODEC TYPE NORMAL single G711 G722 SRT G722 H242 64 kbit s 1B SAMPLING RATE 56 kbit s 1B 48 kHz depending on coding and mode G711 G
47. eir number i e 1 must be used if one line only is needed 1 and 2 if two lines are needed X24 V11 V35 interfaces labelled V11 1 and V11 2 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 all modes except dual 7 kHz codec mode only port 1 V11 1 is used In the dual codec mode both ports must be used In this mode audio channel A is transmitted on port 1 audio channel B is transmitted on port 2 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 13 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Figure 3 Rear panel 14 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 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 Ethernet remote control optional This optional socket is used for remote controlling the unit via an Ethernet connection using TCP IP protocol The installation and operation of this function is described in a specific manual The two LEDs beside the soc
48. ements LED indicators The 10 LEDs have the following meaning amber Only used for maintenance purposes ALARM red Major internal alarm power supply or fuse fault wrong initialisation of the microprocessors detected by the network interface board 12V 5V green Proper operation of power supply sources in the codec sub assembly INT red Major internal alarm in the codec sub assembly EXT red Major external alarm network clock fault decoder synchronisation failure fault on AES input codec fallback OVL amber Audio clipping on one of the inputs TEST red Test mode the equipment is in a loopback mode DEC A B green Proper operation of decoder A or left decoder B or right In mono mode only decoder A LED is active 12 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON Audio monitoring Two LED bargraphs indicate the level of the audio signals either at transmission or reception depending on the position of the Tx Rx switch Tx transmission Rx reception The 0 dB mark corresponds to maximum level or clipping level For the analogue inputs outputs the maximum level is user adjustable see 1 4 1 Audio 1 0 Menu The signal can also be listened to with a headphone connected on the front panel 1 4 or 6 3
49. er than for contribution distribution and commentary links between professionals 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 71 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 6 3 Special back up application The HIFISCOOP 3 5ASystem when including the LL transmission capability is especially adequate for backing up a permanent leased line audio link thanks to an ISDN connection A typical example of this application is shown in the following diagram where a permanent leased line is used for transmitting a radio programme from a studio to a transmitter A codec is installed on each side of the link and each codec is also connected to the ISDN In this way transmission via the ISDN can be used as a temporary back up in case the normal permanent link fails Once the problem on the normal line is solved the connection on ISDN can be released and normal operation in LL mode is restored ISDN network XS Studio Audio gt CODEC Leased line CODEC The HIFISCOOP 3 5AS makes such back up easy because both transmission interfaces ISDN and leased line are available in the same unit Moreover the HIFISCOOP 3 5AS helps to automate the switchover process especially on the transmitter side where most often quick human intervention is not possible The following describes one way of configur
50. erty of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Outgoing call in single communication mode MAIN MENU OK Outgoing call started By user MAIN MENU CHAN 1 First channel established MAIN MENU CHAN 1 ESTABL MAIN MENU DIST NEGOC MAIN MENU CALL CHANN x y All channels are established MAIN MENU WAIT CONF NEGO Network card has received The additional channels are established one by one The negotiated configuration MAIN MENU ESTABL ON yB Local or remote release MAIN MENU RELEASE x y All channels are released MAIN MENU CODEC REL REQ MAIN MENU WAIT CODEC REL The channels are released one by one First channel is establishing The two codecs try to agree on a number of additional channels to establish X Number of channels OK Y Total number of channels to get The network card waits the negotiated configuration from the codec LINK ESTABLISHED The network card informs the codec communication is lost The network card waits the codec to stop 54 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Incoming call single communication mode MAIN M
51. f the D A converter or from the AES input to the AES output depending on the current audio input output format Loop 3 Codec loop from the encoder output to the decoder input without passing through the transmission network e Loop 2 Network data received from the remote codec are sent back to the network e Audio Out gt In loop from audio output after reception and decoding to the audio input before input conversion acting on analogue or digital signals depending on the current audio input output format 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 45 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Refer to chapter 2 4 for a description of the signal path with the various test loops Important notice e The loops are transparent i e the signals derived to a loop are still transmitted to their normal destination As an example with Loop 3 on the compressed data output from the encoder keep being transmitted to the remote decoder in addition to being injected to the decoder input because of the loop 3 e test loop can be activated or disabled while an ISDN connection is running However this should be avoided for loop 2 and loop 3 e The test loops are not maintained after powering off on or re initialisation Reset e Loops 2 and 3 may be prepared before a call but they
52. g disconnected the mains first of all remove the headphone volume knob Unscrew the locking screw in order to release the knob A dedicated tool is recommended Then unscrew the front panel screws The cover and front panel assembly can then be glided backwards and separated from the chassis For re assembling first switch down the lever switch on the front panel then put the cover back in place by gliding it forwards At the end check that the lever aligns well with the corresponding hole in the front panel before securing firmly but gently the cover front panel assembly in its place Mount the front panel screws and the potentiometer knob No other unmounting is needed for the configuration and normal maintenance of the product Any other action would cancel the warranty as well as non observance of the mounting and unmounting precautions described above Motherboard See on following figure the location of the configurable elements These are presented in the standard configuration as set in the factory Optional fan Normal Normal Disabled b om Internal o o 9 External o o_o 00000000000 0000000000000 0000 0 0000000000000090 00000000 CLA e H TBS TB6 Aj be 1 mounted to Ink to Va MAJ Min contact of the corresponding alarm Figure 5 Motherboard configuration Jumpers TB1 and TB2 must stay as indicated on the drawing Jumpers TB3 and TB4 may be moved so
53. has no effect in single codec mode Pressing key 0 sets a call on codec 1 and codec 2 or hangs up both codecs The shortcuts are disabled for outgoing calls when the loop control connection mode is active 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 33 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 4 4 Outgoing Call Configuration Menu ISDN mode only This menu allows configuring the addressing of the remote equipment ISDN numbers and sub addresses See the procedure for establishing a call in 4 6 2 Outgoing call Each B channel of each SO interface is allocated an ISDN number and possibly a sub address so each SO interface has two numbers Consequently 4 numbers are needed for a 256 kbit s link 6 numbers for a 384 kbit s etc This principle ensures compatibility with PABXs that impose a unique number for each B channel If each SO interface is allocated only one number e g direct connection to the public network this same number will just have to be programmed for each of the two B channels of this interface Starting from the OUTG CALL CFG item in the main menu enter OK then enter the numbers in following order validate with OK after each number e NUMBER 1 number of B channel 1 of interface SO 1 e SUB ADD sub address of this channel e NUMBER 2 number of B channel 2 of inte
54. ilable in the LL mode 36 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 4 6 Auxiliary functions Menu This menu allows putting into service and configuring the auxiliary functions data channel and or auxiliary audio channel coordination channel and or relay transmission Starting from the AUX FUNCTIONS item in the main menu after entering OK the programming sequence is as follows Parameter displayed Proposed displayed values Remarks top line bottom line DATA CHANNEL ON OFF BAUD Data 300 bit s Baud rate of the serial data port 1200 bit s only proposed if the data channel is 2400 bit s active 4800 bit s 9600 bit s 3kHz Aux channel _ OFF Only proposed if available ON RELAYS OFF Only proposed if available ACTIVE The choice lists may be limited depending on the capability of the current coding configuration see 2 6 Auxiliary functions 1 ea 4 4 7 Network Parameters Menu This menu first allows the selection of the transmission mode ISDN mode or LL mode if this option is installed In addition parameters related to the transmission network can be set using this menu Starting from the NETWORK PARAM item in the main menu on entering OK the firs
55. ing such a system and details the resulting backup process Transmitter 6 3 1 Studio side In the example above if a failure of the leased line is detected the codec should switch to ISDN mode then it should set a backup link with the other unit over the ISDN When the leased line comes back to normal the ISDN connection should be released and the codec brought back to LL mode and normal operation This can be done in two ways e Either an operator on the studio side can switch the studio codec to ISDN mode and launch a call to the other site via the ISDN To secure and speed up this switchover it may be useful to save the normal and back up modes in separate profiles So emergency back up can be done with just a few key strokes by recalling the back up profile and launching the call with a shortcut key e An alternative way is to set the loop control mode on the studio side and activate the whole switchover by simply activating the input loop Conversely releasing the input loop brings the unit back to normal operation The best situation is when the leased line status is monitored by an alarm contact that closes when the line is down This alarm can be used for activating the control loop so that the studio codec quickly and automatically switches over to backup mode and also comes back to normal when the leased line recovers no manual intervention is needed in such case 72 HIFISCOOP 3 5ASystem User Manual 55 00
56. inimum group delay as reference the group delay distortion on the AD DA path is always less than 1 ms 66 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 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 leveli3 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 4 16 dBu 5 2 6 Crosstalk Crosstalk is less than 80 dB over the whole bandwidth 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
57. irections local to remote and remote to local This is usually required when using proprietary algorithms Asymmetric communication this mode is used for 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 in one direction and Layer III in the other one or MPEG stereo in one direction and MPEG mono in the other one or MPEG in one direction and G722 in the other one etc With the TDAC option asymmetric modes are also available 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 6 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 2 3 Transmission interface The codec includes interfaces to the ISDN and optional interfaces for transmission over leased lines On the ISDN side the transmission interface includes one to three SO BRI interfaces depending on equipment version each allowing transmission over one or two 64 kbit s B channels Thus the total available bit rate ranges from 64 to 384 kbit s 1 to 6 B channels In the dual 7 KHz codec mode the e
58. isation September 2002 Hifiscoop 3 5AS Manual Ed C doc 2 4 Supervision and user 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 a remote control asynchronous serial interfacel The equipment also features a Loop control function call set up and release can be remote controlled with current loops and relays instead of using for this the keyboard and or the remote control port In order to allow easy and quick programming of the codec for specific operational configurations the equipment features fifty 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 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 Three alarm classes are defined e Major internal alarm corresponds to a major fault internal to the equipment e Major external alarm corresponds to a major fault whose origin is deemed external to the equipment for example transmission fault e Minor alarm Besides test loops can be activated e AD DA or AES loop uncompressed digital audi
59. k no password needed Afterwards a password can be programmed by the user if one is needed 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 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 In this case the AES EBU interfaces should be set in the so called asynchronous mode wherein the AES interfaces are not synchronous with the network clock When in this mode the codec derives the sampling clock of the digital audio interfaces from its AES input 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 exhibit unpredictable behaviour as it is left with a floating or wrong reference clock If on the contrary it is decided to synchronise the external equipment at 48 kHz or 32 kHz onto the transmission clock the codec must be configu
60. kbit s Higher bit rates feature a higher audio quality 6 1 2 MPEG Layer III coding The Layer III coding is a higher complexity and higher performance option in the ISO MPEG Audio standard Like in Layer II a 32 sub band filter bank is used but an MDCT Modified Discrete Cosine Transform is also applied Very high compression ratios up to 10 can be obtained with a very good audio quality This makes Layer III coding an interesting choice for transmission over the ISDN with a low number of B channels e g wide band stereo with 128 kbit s where Layer II is no more transparent On the other hand when 3 or more B channels are used the added complexity and transfer delay of Layer III is not justified The bit rates available for ISO MPEG Layer III in the HIFISCOOP 3 5ASystem are the following Mono Dual mono Stereo or Joint Stereo 64 128 kbit s 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 69 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 6 1 3 Auxiliary data in the MPEG frames The auxiliary data are used for the following purposes e Part of the data is reserved for H221 framing J52 standard only for ISDN mode Reed Solomon error detection and correction J52 standard e Data channel J52 e Other auxiliary information relay transmission and or auxiliary audio channel The insertion of this
61. ket show the activity on the network Data Alarm indicators and contacts The Alarm socket 9 pin female sub D is linked to two relays providing isolated contacts which are closed in case of an alarm condition e Minor alarm contact audio input overload e Major alarm internal and external contact a red indicator AI also indicates this relay is closed By internally configuring the equipment jumpers on the motherboard it is possible to program the indicator and relay to react to only one type of major alarm internal or external The pin out of the socket and the detailed characteristics of the alarm relays can be found in chapter 5 1 7 Alarm contacts 60 AES Sync socket This 9 pin female sub D socket can be used in relation with the digital audio mode when the digital interface option is present on the equipment The connector outputs clock and synchronisation signals that can be used for locking an external device e Word Clock with a frequency Fags sampling frequency of the AES input and output e AES signal derived from the same frequency Fags this signal is identical to the AES output available on output A when the digital audio format is selected 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 as well as an op
62. leased line th mode Compared to the latter case the ISDN mode brings a number of additional parameters to be controlled dial number s and possible sub address es for the destination of a call call set up and control e local ISDN protocol and numbers e miscellaneous network operation parameters Moreover two protocol options are available for MPEG coding J52 or proprietary mode The status display is also slightly different in order to recall the transmission mode currently in use Second in each of the transmission modes 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 The dual codec mode with ISDN transmission especially has an impact on the control and supervision of calls as the unit behaves as two independent codecs In the following the main operation modes are shortly designated as ISDN mode or LL mode for leased line mode Single codec or Dual codec 1 Note that in some applications the unit may be connected in this mode to a DSU providing access to the ISDN However in such case the codec actually behaves exactly as described as the leased line mode and all the ISDN specific issues are under control of the DSU 26 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the pr
63. less than 3 degrees over the whole bandwidth for any sampling frequency 5 3 Power supply The codec operates from mains 85 265 Vac 47 440Hz Protection is provided by T 2A fuses The maximum power consumption is about 25 W 60 VA max 5 4 Dimensions and weight The unit is a 19 inches frame of 2U height 88 mm or 3 5 and 320 mm depth 12 5 Its weight is about 5 2 kg 1 Worst case for all types of algorithms MPEG performs better than the others 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 67 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 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 Optionally the unit may include a fan that extends the range to 55 C 131 F In such case the fan only runs when the internal temperature is above a threshold corresponding to a 25 C 77 F external temperature The HIFISCOOP 3 5AS 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 HIFISCOOP 3 5ASystem are the following e HIFISCOOP 3 5
64. m User Manual 9 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 2 6 Auxiliary functions 2 6 1 Data channel 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 The interface speed is programmable at 300 1200 2400 4800 or 9600 bauds However the actual transmission capacity depends on the coding algorithm as indicated by the table hereunder Coding type Possible transmission rate bit s 300 1200 2400 4800 9600 G722 H221 H242 MPEG Audio Layer J52 4SB ADPCM G722 SRT No data channel Proprietary MPEG Table 1 Capacity of data channel depending on type of coding 2 6 2 Relay transmission 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 A typical application is the
65. n coding standards It includes the following features Framing as per ITU T H221 recommendation ensuring byte synchronisation and interchannel synchronisation when more than one 64 kbit s B channel is required for the desired bit rate Interoperation procedures as per 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 HIFISCOOP 3 5AS 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 is 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 5 MPEG coding for leased line transmission J52 is only applicable to ISDN transmission and no inverse multiplexing is needed for leased line transmission because a single d
66. n of control data along with the main data This framing is also used for interchannel synchronisation of different B channels on the ISDN network necessary for inverse multiplexing in order to gather these B channels as a resulting nx64 kbit s data flow 6 1 6 H242 protocol H242 recommendation allows multimedia terminals to establish links between them in a transmission mode coding algorithm and format which is compatible with the reception and decoding capacity of the terminals A negotiation is carried out between the terminals to manage the link H221 framing transports the control data the terminals exchange The user defines beforehand through the codec configuration the desired quality and features Especially the bit rate configured imposes a maximum number of B channels the codec will use in the subsequent link 70 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON The link starts first with one B channel that the two terminals use to negotiate with the H242 protocol the coding configuration in each direction Each side then decides to start with an encoding mode that the other side has indicated it can decode Actually with J52 the two encoders may use a different configuration e g stereo in one direction mono in the other one At thi
67. n the algorithms and protocols used 6 1 1 MPEG Layer Il compression algorithm The ISO MPEG 11172 3 standard defines a bit rate reduction technique for high quality audio signals It typically reduces the bit rate to 1 6 of the initial uncompressed bit rate using sub band coding and psycho acoustical modelling MPEG is a frame based coding technique where the signal is acquired and compressed in segments of 1152 audio samples 24 ms for a 48 kHz sampling frequency The ISO MPEG Audio Layer II frame is divided into 4 main blocks e Header synchronisation and description data Error detection CRC16 e Audio data scale factors binary allocation data quantized sub band audio samples e Auxiliary data HEADER ccce AUDIO DATA AUXILIARY DATA The detailed audio data structure is dynamic and varies with the time varying characteristics of the audio programme The audio frequency range is divided into 32 sub bands To yield the desired bit rate reduction the available bits are dynamically allocated to the different sub bands the samples in some sub bands are roughly quantized and some sub bands are even discarded Psycho acoustic modelling is used to keep the resulting sound distortion as low as possible despite this degradation The bit rates available for ISO MPEG Layer II in the HIFISCOOP 3 5ASystem are the following 64 128 192 kbit s 64 128 192 256 320 384 kbit s Stereo or joint stereo 64 128 192 256 320 384
68. nfigurations can be detected automatically by the 5A System Note that the 5A system is only active for ISDN connections but not for transmission over a leased line where unit are connected permanently and there is not a calling party and a called party 1 tormer CCITT 4 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 2 2 2 Notes about G711 G711 is the standard coding used for voice transmission on public telephone networks This algorithm is used for links via ISDN with telephones or hybrid devices G711 is available only for ISDN transmission not over the leased line interfaces 2 2 3 Notes about G722 With G722 coding two synchronisation modes are available e Statistical recovery byte synchronisation method alias SRT e H221 H242 synchronisation in this case 1 6 kbit s from the compressed data are used for this H221 H242 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 This is recommended practice according to J52 2 2 4 Notes about J52 and MPEG coding The ITU T J52 recommendation was defined in order to allow the interoperability of various equipment over the ISDN using commo
69. nfigure the auxiliary functions Menus CODING CFG AUX FUNCTIONS Configure parameters of the network interface Menu NETWORK PARAM Enter edit or display local dial numbers and or sub addresses Menu LOCAL ISDN CFG Configure the audio interfaces Menu AUDIO I O System configuration Menus SYSTEM SECURITY ALARM ENABLING Change country specific parameters language ISDN protocol Menu COUNTRY Save and recall settings to from memory 50 profiles Menu PROFILES Activate test loops Menu TESTS Besides the system displays the following information Auto test progression detected faults Status of incoming call call received link established and remote caller number Status when releasing the line Configuration as programmed and as negotiated Status of test loops 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 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 25 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 1 Main operation modes There are two parameters which have a major impact on the operation of the unit and on the user interface First the unit features two transmission modes transmission over the ISDN and
70. ns The I signals pins 5 and 12 may be used for signalling the codec whether the link is operative especially if the data clock is valid This is useful only in the double codec mode when using both data interfaces The codec uses this signal to detect a transmission fault on the interface and search for synchronisation on the other interface To use this option the Ia signal pin 5 must be connected to ground pin 8 and the signal from the DCE must be connected to Ib pin 12 The signal from the DCE e g RLSD pin F on 34 pin connector pin 13 on 37 pin connector must be active as long as the connection is OK and de activated in case of a transmission loss 6 5 Copy of CE and ISDN certificates Attached on following pages 74 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc
71. o data are looped from output of analogue digital converter to input of digital analogue converter if digital format AES 15 selected this loop redirects the digital audio input to the digital audio output e Loop 3 or Codec loop compressed audio data are looped just before the network interface e Loop 2 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 loop audio output to audio input this allows the codec to send back to the remote codec the signal it receives after decoding then re encoding The following drawing schematically shows the test loops Roe Conversion y Encoding gt Audio Audio Conversio outputs output 1 An Ethernet interface is optionally available for remote control via a TCP IP connection 8 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 2 5 Audio monitoring This function enables the monitoring of the audio input before encoding or the audio output after decoding the received signal and provides e A display of the signal level e A test output on a stereo headphone jack 55 000 039 Ed C HIFISCOOP 3 5ASyste
72. of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 5 1 8 Remote control interface 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 baud rate 300 1200 2400 or 4800 bauds its parity none even odd the number of bits 7 or 8 and the number of stop bits 1 or 2 For use with the TeleScoop control and supervision software leave these parameters on their factory setting 5 1 9 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 Ground 5 owe sd 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 61 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 5 1 10 Synchronisation interface The Sync connector 9 pin female sub D outputs signals for synchronising external equipment The following table indicates the pinout of the connector and the electrical format of the signals Fae sunt 3 3 owed TTL level
73. ogram the maximum number of times the codec will redial before giving up 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 57 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 7 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 simultaneously press the ESC key and the Reset key on the front panel the Reset key is just above the word Scoop on the left hand side Keep the keys pressed until you hear a beep and the unit restarts At this moment release the Reset key keeping the ESC key pressed until you see the message Memory cleared Release the key Release the ESC key and wait for the completion of the reset process The factory default password is blank After global erase all profiles are set to G722 SRT ISDN mode and all ISDN numbers are blank Warning all profiles are reset in this way after such a total reset Note in some cases when downloading a new software version the configuration is reset to default In any case it is highly recommended to reset the whole configuration when downloading a new software version 58 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AE
74. omatically In addition it is possible to get information on the status of the device Summary display The display cycles through the following sequence e OK or LL when in LL mode displayed twice when in dual codec mode e Audio and coding summary configuration e Auxiliary functions summary The audio and coding summary typically appears as follows This These are Audio I O display is initial format for codec 1 parameters ANA C1 INT MPEGL2 256 48 S Coding algorithm Bitrate Sampling peus kbit s ne mode kHz e When the unit is configured as a double G722 codec the summary for codecs 1 and 2 are alternatively displayed e When the unit is in ISDN communication with J52 protocol COD and DEC summaries are also displayed showing the actual configuration of resp the encoder and decoders as they may be different from the initial one e is for proprietary MPEG coding e The sampling rate is not displayed when it is not programmable i e for G722 ADPCM etc The auxiliary functions summary appears as follows AUX FUNCTIONS Data R elay f Aux Audio is n channel 15 noractive transmission active or not installed 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 31 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc Status
75. operty of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 2 Equipment start up During start up the unit runs automatic tests then displays auto test messages This initialisation lasts around ten seconds Then the display is example for ISDN mode single codec MAIN MENU OK The display is periodically replaced for a summary of the current configuration audio input output format coding type bit rate auxiliary functions At this stage if the configuration includes a non blank password this must be entered in order to access the menus press a direction key e g enter the password digits then OK On factory setting or after erasure of the unit memory the password is blank so this step is skipped The diagram hereunder shows this phase from power on to the idle state at the root of the main menu after opening a session If the password is blank the unit automatically goes to the main menu root without asking for a password Note it is possible to go back to the initial state locked session not __ opened by going to the SYSTEM SECURITY menu and selecting Lock now see further in 4 4 9 Unlocked session opened ESC or wrong password 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 27 This document is the property of AETA and can not be duplicated without a
76. ot proposed in the LL mode as there is no distinction in this mode between J52 compliant and non J52 compliant MPEG coding Choices with the TDAC algorithm are not presented if the option is not available in the unit CHANNEL MODE this choice is not presented for mono only algorithms For J52 compatible algorithms in ISDN mode the encoder and or the decoder may use a different mode after the automatic negotiation when establishing the link BIT RATE this choice is only presented for MPEG or G722 H242 as the bit rate is fixed for all other algorithms For J52 compatible algorithms in ISDN mode this can be seen as a maximum desirable rate After setting up the link the actual bit rate may be lower if required by the remote codec e g initial setting is 256 kbit s or 4 B channels but the remote codec only has capability for 2 B channels ERROR CORRECTION only presented for MPEG J52 Layer II or III However the error correction feature is also available in the LL mode IMPORTANT NOTICE when the 5A System is activated in ISDN mode the settings in this coding configuration menu apply to outgoing calls only When a call is received by the unit the coding configuration is derived from the configuration that is detected by the unit regardless of the adjustments previously done in the menu However when the line is released these initial settings are restored ready to be used if an outgoing call is sent 1 G711 is not ava
77. quipment is equivalent to two mono codecs Each mono codec can transmit independently from the activity of the other codec over a B channel from the first SO interface Only the first SO interface is used in this configuration The codec synchronises itself onto the ISDN network clock when a link is active In addition to the ISDN interfaces the codec optionally 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 port 1 In the 2 64 dual mono G722 mode the two ports provide two independent interfaces the equipment is similar to two mono codecs When transmitting in the leased line mode the codec synchronises onto the network clock provided by the X24 V11 interface port 1 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 While in leased line mode the codec can switch automatically to the ISDN interface whenever it receives a call from the ISDN line it will then switch back to the leased line mode later when the ISDN link is released 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 7 This document is the property of and can not be duplicated without author
78. r enables or not the 5A System which is used for automatic detection and adjustment when answering incoming ISDN calls The factory and recommended setting is Whenever this capability is set Off incoming calls are processed with the parameters set in the Coding parameters menu except when J52 is used because J52 allows for negotiation with a remote J52 codec and the final settings may differ from those selected in the menu Auto redial codec 1 codec 2 This parameter enables or not the auto redial capability for each codec when in double codec mode When this function is active and when the unit is the calling party it automatically retries to connect in case the connection fails or an established link is dropped for any reason other than local release i e the line was released by the user Two specific causes for automatically re establishing a link in this way are the following The line was dropped by mistake because of a network fault The codec was switched off or a power shortage occurred while a link was active in such case the codec will reconnect automatically right after starting up Warning when auto redial is active the termination of a link must always be done on the calling party side Whenever the line is released by the receiving party the calling unit will redial and re establish the link Redial attempts This parameter is for the number of times the unit will try to
79. ral case only the number of number sub address pairs actually needed depending on the current configuration has to be entered the display comes back to the main menu after the last useful numbers have been entered Although the display only shows 16 digits 25 digit numbers can actually be entered When a number includes more than 16 digits initially only the 15 leftmost digits are displayed Pressing the right arrow remember that the left arrow is for erasing the rightmost digits rotates the number to the left and shows the rightmost digits Sub addresses are limited to four digits 42 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 4 9 With this menu it is possible to Security Menu Display the version numbers of the various software components in the equipment e Change the equipment password e Configure the remote control serial port Starting from the SYSTEM SECURITY item in the main menu after entering OK the programming sequence is as follows Parameter displayed Proposed displayed values Remarks top line bottom line SOFTWARE VERSION V1 01 4 03 uC and DSP version SO V 6 06 ISDN card version use the arrow keys to display one or the other line L
80. red in synchronous 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 Sync socket also outputs separate signals for this purpose see description in 3 2 2 15 and pinout ini5 1 10 p 52 The digital audio signal at the codec input must then come from a device synchronised by this way 18 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 3 5 First level maintenance 3 5 1 Internal description The supply sub assembly produces from the mains three power sources at 5 V and 15 V used by the boards in the unit This sub assembly includes an AC DC converter and a mains socket switch fuse combo The motherboard brings power supply to the other boards and carries all the rear panel connectors The Audio board groups the following functions e Audio acquisition e Analogue digital conversion e Digital gt analogue conversion Audio restitution e Interface with the X21 X24 V11 ports optional Onto the board is mounted a DSP daughterboard which carries out compression in the desired format The transmission interface board includes 1 to 3 depending on equipment version SO ISDN interfaces complying with ITU T re
81. rface SO 1 e SUB ADD2 sub address of this channel e NUMBER 3 number of B channel 1 of interface SO 2 e SUB ADD3 sub address of this channel e NUMBER 4 number of B channel 2 of interface SO 2 e SUB ADDA sub address of this channel e NUMBER 5 number of channel 1 of interface SO 3 e SUB ADD5 sub address of this channel NUMBER 6 number of B channel 2 of interface SO 3 e SUB ADD6 sub address of this channel The above describes the maximum case when six numbers are needed 384 kbit s link in a codec equipped with three SO interfaces In the general case only the number of number sub address pairs actually needed depending on the current configuration has to be entered the display comes back to the main menu after the last useful numbers have been entered Remember that when only the last digits have to be changed you can erase the last rightmost digits by pressing the left arrow and then enter the new digits Leave a number blank if you want to copy the dial number entered in the previous position not valid for sub addresses As an example leave the line blank for Number 4 if you need the same number as Number 3 You can get the same result by erasing the line just pressing the key Although the display only shows 16 digits 25 digit numbers can actually be entered When a number includes more than 16 digits initially only the 15 leftmost digits are displayed Pressing the right arrow remember that the l
82. rrent user operation is aborted and lost 4 6 1 Local ISDN configuration Local number LN This number allows multiple subscriber numbering or MSN This number is 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 required The PABX may also impose a unique number for each B channel within the same SO 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 Sub address SA This number differentiates several terminals connected to the same SO bus which are allocated the same call number s The sub address is especially useful in dual codec mode having a unique sub address set for each of the two codecs a remote device can call specifically one among the two codecs Incoming calls acceptance Each unit is accessible or differentiated by e Alocal number LN 25 digits max e A local sub address SA 4 digits max The configuring of these parameters impact the acceptance or rejection of INCOMING CALLS Number match is deemed and the incoming call is accepted if the called destination number and SA
83. s menu Pressing OK validation allows one to enter the secondary menu whose title is displayed on the bottom line Pressing key ESC cancel allows to come back to the root of the main menu The second level is made of various secondary menus Once a secondary menu is entered key OK validation allows going to next item Each item is either a scroll list of choices or values for a parameter or a list of non exclusive choices or a number to enter Keys and lt allow scrolling in lists the valid current choice is shown by a character displayed on the 16th position Keys 0 9 and are used for editing a number or password The display moves to next item after pressing OK After selecting the last item with OK the selected parameters are written to non volatile memory Please note that the whole group of items in a menu is saved after validating the last item with OK but not only one item at a time For a list of non exclusive choices OK is used to select unselect the current item each selected item is marked with a character displayed on the 16th position To save the list of choices move to the last item SAVE LIST either with the arrows or faster with the key in order to save the whole list Key ESC cancel cancels any change or edition made in a secondary menu and brings back to the main menu Note that while an ISDN connection is active it is allowed to scroll the menus and see the current se
84. s moment the equipment establishes the additional required B channels If it is not possible to establish them the link is released 6 1 7 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 Compatibility with previous generation products HIFISCOOP 1 Low coding decoding delay 4SB ADPCM e MPEG with compatibility with equipment not compliant with J52 recommendation e Time Domain Aliasing Cancellation MDCT based algorithm license from France Telecom CNET 6 2 Notice regarding licenses and rights MPEG Audio Layer III audio coding technology is licensed by Fraunhofer IIS The license and right for the use of this product does not include the right to create generate encode or otherwise modify data or bit streams be used sold published distributed disposed of or otherwise marketed via pre recorded media such as but not limited to CD ROM magnetic tapes memory cards and the like to be used sold reproduced published distributed disposed of or otherwise marketed via any kind of network if a user will have to pay a monetary or equivalent compensation for the access copying etc of such data or bit stream e the purpose of broadcast and or radio and or multicast service transmission such as but not limited to Internet Radio and the like oth
85. s to remote equipment The following diagram shows the sequence starting from the COMMUNICATION item in the main menu MAIN MENU COMMUNICATION and link 3 inactive 4 SET UP 1 RELEASE 2 same principle as codec 1 Start communication SET UP 2 SET UP 2 or RELEASE 2 same principle as codec 1 Back to Esc main menu RELEASE 1 CONFIRM lt OK gt Release line Back to main menu root Back to main menu root After starting or releasing communication the display comes back to the main menu root in order to indicate the status changes for the current link To release a link there must always be a confirmation by OK Notes e Keyboard shortcuts are also available to start outgoing calls as described below Anerror message is displayed whenever all the ISDN dial numbers of the remote codec have not been entered beforehand e When the loop control connection mode is active outgoing calls are controlled only by means of optically isolated input loops For details about configuring and using this feature please refer to interface Call shortcuts Using these shortcuts it is possible to start stop a link without having to enter the communication menu From the main menu root OK display Pressing key 1 sets a call on codec 1 or hangs up Pressing key 2 sets a call on codec 2 if the equipment is configured as a double codec or hangs up the key
86. solated and release the line by de activating this loop In such case an outgoing connection is established or released only by this way and no more from the front panel or the remote control interface however all other parameters are still controlled from these interfaces as in the normal mode Besides whatever the connection mode normal or loop control a dry loop is closed when an ISDN connection is active TR The loop control interfaces are described 3 2 2 5 1 1 1 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 11 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 3 2 Physical description of the equipment The HIFISCOOP 3 5ASystem codec is housed in a 19 inches chassis of 2U height 88 mm 3 5 it includes a universal mains power supply 3 2 1 Front panel All the elements needed for local control are on the front panel On the left hand side one can find a keyboard and a LCD display described in chapter Ai dealing with the operating mode that are used for configuration and call set up The right hand side is as follows AUD s u ui INT OWL 3 m B SEE E le 7 TE EE EJ d ALARM EXT TEST S um cm mi EM 1 i Figure 2 Front panel of HIFISCOOP 5AS right From left to right one can find the following el
87. t item presented is NETWORK ACCESS with a choice between ISDN and Leased Line In case this main selection is changed the unit immediately restarts after switching the transmission mode then comes back to the menu root ready in the new mode If the transmission mode is not changed the menu then allows the setting of parameters related to the network All coding configuration parameters may change when switching the transmission mode because each mode has its own set of parameters memorised separately 1 It is not allowed to change the transmission mode if currently on line in ISDN mode The line must be released first before switching to LL 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 37 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc In ISDN mode after passing this first choice just confirming with OK the current ISDN mode this menu allows the setting of various call management parameters The programming sequence from this point is shown in the following table Display top line Proposed values Remarks 5A SYSTEM Off On default recommended AUTO REDIAL COD1 Yes No AUTO REDIAL COD2 Yes Proposed only in case of dual No codec configuration REDIAL ATTEMPTS From 1 to 20 Change the value by pressing the arrows TIME BEFORE DIAL From 1 to 30 seconds Change the value
88. t loop n 1 b Input loop n 1 a Input loop n 2 b 22 Input loop n 2 a 9 5V of isolated power supply option 21 OV of isolated power supply option All loops are isolated and bi directional free polarity Their characteristics are Input loop control current 6 mA max 100 mA Resistance of input loop 470 Q current limiting series resistor Maximum switching power output 10 VA Maximum switching voltage output 100 V peak Maximum switching current output 500 mA Resistance of output loop 10 A 5 to 12V source may be connected directly on an input loop because the internal series resistor is dimensioned for this purpose For a dii iid source it may be necessary to limit the sin current power the input eel 64 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 5 1 13 Coordination channel interface 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 Lm on Coordination
89. t s link An error message is displayed if remote numbers are missing Operating rules in double communication mode When the equipment is configured in double codec mode it is functionally equivalent to two codecs 64 kbit s each 1 B channel and two links are handled The links are simultaneous or not and they can correspond to two remote codecs in different locations Only the SO port 1 is used because each link uses one B channel out of this interface To set up a call on codec 1 the Remote Number 1 Remote sub address 1 pair must be configured similarly codec 2 must be set up by configuring the Remote Number 2 and Remote sub address 2 See the OUTG CALL CFG menu Also program the local numbers see above Local ISDN configuration LOCAL ISDN CFG menu Recall in this double codec case the LN SA pairs should preferably be different at least by their sub address so that a remote unit can call specifically one codec or the other To call on codec 1 enter the COMMUNICATION menu or else from the main menu root use shortcut key 1 or loop activation when in loop control mode To call on codec 2 enter the COMMUNICATION menu or else from the main menu root use shortcut key 2 or loop activation when in loop control mode It is also possible to launch the two calls at the same time by using shortcut key 0 disabled in loop control mode 55 000 039 Ed C HIFISCOOP
90. that respectively an external alarm TB3 or an internal alarm is inhibited and does not trigger the major alarm relay and the rear panel LED 20 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON Last by setting jumpers on TB5 and TB6 it is possible to short to 0 V one contact from each alarm relay These links are not done in the factory Caution when establishing such links the alarm contacts are no more isolated If the unit is equipped with a fan extended temperature range option the motherboard is equipped with a thermostat Jumper TB7 must stay in its factory set position Normal The Off position disables the fan except if temperature reaches a safety limit Audio board shown in their factory configuration The jumpers on TB4 TB5 TB6 TB7 and TB8 must stay as indicated on the drawing specifically e 1 2 for TB4 TBS TB8 e 2 3 for TB6 TB7 Besides the jumpers on JP1 must stay as indicated but they are replaced for an AES EBU module when the option is installed Jumpers TB2 and TB3 allow the configuration of the audio inputs impedance e 1 2 rearmost 600 impedance factory setting e 2 3 to the front 10 impedance Jumpers TB9 to TB11 enable the activation of three test loops only useful for
91. thorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 6 2 Outgoing call Introduction The destination of an outgoing call is defined by e A destination number 25 digits max e A destination sub address 4 digits max This sub address is optional The outgoing call processing includes the following phases e Display of the call destination number of the destination Call establishment Operating rules in single communication mode When the equipment is configured in Normal mode single codec the procedure to set a call to a remote codec is as follows If necessary program the local numbers see above Local ISDN configuration LOCAL ISDN CFG Menu As long as the unit stays connected to the same ISDN lines this configuration remains in non volatile memory and it is not needed to reprogram these numbers Prepare the call by programming the Number SA pairs of number and sub address for the remote codec OUTG CALL CFG The numbers must be programmed in the order they are locally defined for the remote codec Once programmed these numbers are kept in non volatile memory and it is not necessary to enter them again for repeated calls to the same destination Start the call COMMUNICATION menu or shortcut key 1 or loop activation when in loop control mode To set a link at nx64 kbit s n Number SA pairs must be configured e g 4 numbers for a 256 kbi
92. tional isolated 5 V power supply that can be used to provide current for the loop and relay interfaces 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 15 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 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 Configuration of the audio interfaces including selection of analogue or digital format for the audio interfaces maximum level for the analogue inputs and outputs and format of the AES EBU interfaces when digital format is selected 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 Parameters of the network access type of network interface ISDN or leased line ISDN line numbers network protocol version etc Parameters of the keyboard display interface as an example selection of the language for the display messages parameters of the remote control port The parameters dealing
93. tive except if receiving an incoming call 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 39 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc The auto redial feature is implicitly active when loop control is active the codec tries to keep the link and automatically recalls the remote unit if the line drops as long as the input loop is active The time before redial parameter described in the above is also applicable to the loop control mode On the other hand the redial attempts parameter is not applicable here because the unit will always try to recover the link until the loop is left inactive Note that as an important consequence when using loop control the termination of a link must always be done on the calling party side by de activating the input loop Whenever the line is released by the receiving party the calling unit will redial and re establish the link Manual Automatic answer When manual answer is selected an incoming call is not directly accepted Rather it is announced on the display and with an audible signal and the user can accept it OK key or reject it ESC key This parameter also has an E on the behaviour yis the unit if a call is received while in access restrictions can ibe defined e On keys 1 amp 2 like for the menus the password if not blank has to
94. 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 J52 and MPEG coding relay transmission can be activated along with other auxiliary functions For all the other algorithms relay transmission is activated in place of the data channel and it is not available with G722 SRT proprietary MPEG or asymmetric TDAC 2 6 3 Coordination channel 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 rate This channel uses a compression algorithm of CELP HLTP type This function is only available when the main audio programme is MPEG J52 or ADPCM encoded With ADPCM the coordination channel cannot be used along with other auxiliary functions i e data channel and 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 AETA Audio products as these functions are not covered by the J52 recommendation 1 In the particular case of the asymmetric TDAC modes the data channel is unidirectional data are transmitted only with the TDAC encoded audio not with the return G722 SRT encoded audio 10 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C
95. ttings but parameters cannot be changed i 1 One exception is the Tests menu as test loops can be activated or removed during a link 55 000 039 Ed C HIFISCOOP 3 5ASystem User Manual 29 This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 4 1 Main menu The following diagram shows the items of the main menu Starting from the root one can scroll through the items with the arrow keys As shown by the diagram it is faster to use the left up arrows to go to the items above the root on the diagram As an example the PROFILES menu can be reached by pressing once the left arrow instead of 12 times the right arrow From one item one can enter the corresponding secondary menu by pressing OK SYSTEM SECURITY ISDN mode only Not visible in LL mode MAIN MENU AUX FUNCTIONS gt The following sub chapters describe the various secondary menus 30 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 4 2 Main menu root The unit comes back to the main menu root at power on and each time after parameter changes in a secondary menu When on that default position a summary of the current configuration is displayed aut
96. ull scale digital audio So the maximum input level is also the input clipping level and the maximum output level is the maximum available level when full scale audio is decoded The default factory setting is 16 dBu for both input and output Last the output load item is for indicating the load that is connected at the analogue outputs The unit takes account of this parameter in order to compensate for the slight amplitude loss that is encountered with a 600 Ohm load 44 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 4 12 Country Menu This menu is for the selection of the language used in the display and the selection of the ISDN protocol MAIN MENU COUNTRY Pays or PAYS Country Frangais English LANGUE English France Tel VN6 Euro ISDN France Tel VN3 ISDN VERSION Euro ISDN OK The option list for the ISDN protocol may be different from this diagram for specific equipment versions 4 4 13 Tests Menu This menu gives access to various loops in the equipment for test purposes From the TESTS item in the main menu after entering with OK a scroll list is proposed e NONE Normal normal operation mode with no loop e AD DA or AES loop from the output of the A D converter to the input o
97. uthorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc 4 3 Description of the keyboard The keyboard shown hereunder includes 18 keys among which ten numeric keys are used for entering dial numbers 5 coop ystem Back to main menu Back to main menu root Validation of a choice and move to next selection Enter a secondary menu Scroll a list of possible values for a parameter Left Scroll a list Correction Correction when entering a number Star Back to previous choice in a scroll list Erase current digits when entering a number Shortcut for recalling a profile Go to Save list in a non exclusive choice list e g list of enabled alarms From anywhere in the menus it is possible to go back to the main menu root by hitting ESC twice When entering a number the previous value is always shown first Entering a number key first erases the whole line On the contrary one can change just the last digits by first pressing lt then entering the new digits 28 HIFISCOOP 3 5ASystem User Manual 55 000 039 Ed C This document is the property of AETA and can not be duplicated without authorisation September 2002 Hifiscoop 3 5AS Manual Ed C doc LEESON 4 4 Description of the menus The unit features two menu levels The first level is the main menu Keys lt and are used to scroll the items secondary menus in thi

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