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User manual - AETA Audio Systems

1. _ For dialling in IP mode it is possible to force the numeric mode instead of the default alphanumeric mode First press the key the gt prompt will appear and then only numbers can be entered 4 4 Description of the menus The unit features a tree structured menu and the three function keys on the bottom of the LCD are used to navigate through the menus The OK key is used to confirm some settings or enter data and the Esc key allows to go back to the upper menu level Pressing this key several times makes sure you come back to the main default menu From the top menu you can directly enter one of the three main menus by hitting the function key just beyond TOOLS maintenance and housekeeping functions and access to status information DIR access to the directory SETUP configuration of the codec The TOOLS menu is itself divided into three sub menus Status information about the status and alarms Maintenance test and maintenance functions Misc miscellaneous functions and settings The SETUP menu is also divided into three sub menus Net selection and configuration of network interface and parameters Audio configuration of audio interfaces and parameters Cod selection and configuration of the coding algorithm The following diagrams show the various sub menus and accessible parameters Note that the character in these diagrams shows the default and or factory re
2. Note that you can select the language for this page If you click Network on the left you can get a display of the IP addressing data It is possible to change settings and click the SAVE button to write them into the SCOOP 4 REFRESH reloads the page from the unit to update the display The network settings can be updated from this page but e Obviously it is not usually possible to do the initial setting in this way e careful before changing these settings as a wrong setting here can make you lose control over the unit In such event go back to 3 5 above 1 Important notice each SAVE button only uploads a section enclosed between two bold horizontal lines unlike the REFRESH button which refreshes the whole page 26 SCOOP 4 User manual 55 000 053 F v AETA AUDIO SYSTEMS 3 6 1 SIP registration and configuration data You can access these parameters if you click the SIP configuration button on the embedded server html page This is the only way to configure these settings and most cannot be set from the keypad except those mentioned in the following The following is an example screen copy and some comments about the displayed data SCOOP 4 IP Configuration AETA AUDIO SYSTEMS General configuration E Codec mode SIP Multicast send Multicast receive Language English v SAVEMODE REFRESH SIP Line i Registering
3. nennen nnne 24 3 6 Use of the embedded html server 26 3 7 Pirst level maintenance e eter rt 30 4 Detailed operating mode User interface 4 eere ecce ee eee eene eerte ee eene eene sna 32 4 1 Mam operation 32 4 2 Equipment 32 4 3 Description of the keyboard nete eere det Lue e bra p eden 33 4 4 Description of the menus cerit eerte 33 4 5 Handling the configuration profiles 40 4 6 Setting up a link m ISDN 41 4 7 Setting up a link in mode echec edicere ere prier 43 4 8 0 NE 46 4 9 Evo Fev EE 46 4 10 Setting up a backup lnk uoti vett ettet eer decedente Pep 47 4 11 Erasing and resetting the configuration sees nene 49 4 12 Backing up and recalling the 49 5 Technical characteristics T 50 5 1 Characteristics of interfaces 50 3 2 AUGLO EERE EEE O EAE 57 5 3 Network protocols and ports 58 2 4 Power SUPPLY E 58 5 5 Dimensions and weight
4. iet ace 58 5 6 Environmental characteristics entente ie enata ai anat 59 2 7 Versions Options neci nd tie e oi 59 5 8 Accessories and related products as eie eset tentent aeta e ka e epa 59 55 000 053 F SCOOP 4 User manual v AETA AUDIO SYSTEMS o 6 1 Complements on the algorithms and protocols used 6 2 Overview of the SIP protocol esee ene 6 3 Some methods to deal with NAT routers and firewalls 6 4 ISDN error 6 5 V35 interface adaptation sse ener rennen 6 6 Notice regarding open source code sees eee eee SML qu SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS 1 General The SCOOP 4 codec allows the bi directional transmission of one or two audio signals with bit rate reduction over digital leased lines ISDN lines or IP protocol networks The codec is available with the following main product versions e SCOOP 4 DUO LL IP with digital leased line interfaces and an Ethernet interface for IP transmission e SCOOP 4 TRIO LL IP ISDN 2B with digital leased line interfaces Ethernet interface and an ISDN interface e SCOOP 4 TR
5. 5 1 Characteristics of interfaces 5 1 1 Analogue audio inputs Audio characteristics are measured over a 20 to 20 000 Hz bandwidth except when differently stated The inputs are balanced type using 3 pin female XLR sockets Maximum input level adjustable from 0 to 22 dBm 0 3 dB Nominal input impedance 600 Q or 10 menu setting SETUP Audio Analog Input Impedance Impedance balance TBD Common mode rejection ratio gt TRD JB measured with Z 600 5 1 2 Analogue audio outputs Audio characteristics are measured over a 20 to 20 000 Hz bandwidth except when differently stated The outputs are balanced type using 3 pin male XLR sockets Maximum output level adjustable from 0 to 22 dBm x 0 3 dB Nominal load impedance 600 Q or 10 Output impedance 50 Q Symmetry gt TRD JB 7 215090 5 1 3 Digital audio input and output These interfaces comply with recommendations AES3 1992 e EBU Tech 3250 e CCIR Rec 647 They support in genlock mode a sampling rate from 28 to 96 kHz In master mode the unit can be set in one the following sampling rates 32 48 and 96 kHz 5 1 4 Headphone output front panel This output 6 35 mm jack on front panel is for the connection of a 32 headphone It is also possible to plug a high impedance headphone however the maximum available power will be lower 50 SCOOP 4 User manual 55 000 053 F 5 1 5 X24 X21 V11 V35 inter
6. Conversion 4 ____ Decoding 4 outputs output 55 000 053 F SCOOP 4 User manual 9 v AETA AUDIO SYSTEMS 2 5 Audio monitoring This function enables the monitoring of the audio input before encoding and the audio output after decoding the received signal and provides A display of the signal level both at the encoder input and the decoder output e A test output on a stereo headphone jack monitoring either the encoder or decoder audio signals Note as the audio output is monitored immediately after decoding this monitoring position is not sensitive to the possible activation of the audio test loop see above diagram contrarily to the physical audio outputs both analog and digital 55 000 053 F SCOOP 4 User manual 10 v AETA AUDIO SYSTEMS 2 6 Auxiliary functions 2 6 1 Data channel This function is not available in IP transmission mode In leased line mode or ISDN mode a bi directional data channel can be transmitted along with the compressed audio signals by reserving a fraction of the transmitted bit rate The equipment includes a serial asynchronous port for this purpose The data are transparently transmitted end to end hardware signalling is not available This function is only available when the main audio programme is encoded in G722 H242 ISDN mode MPEG excluding the proprietary ISDN mode or ADPCM The interface speed is
7. The addressing scheme is normally static as DHCP can rarely be used on a public access In fact this situation is very seldom met in the field First the Internet access is usually protected by a firewall which will as a principle block a priori the desired connection In such case exceptions to the firewall security rules must be created that will allow this connection this has to be done by the person in charge of the network management Most often on one access if not both the codec accesses the Internet via a NAT router This router shares Internet access with one or a few public addresses among the equipment on the LAN On this LAN the devices get local private addresses and the router carries out an IP address translation Note that e As an example a consumer ADSL modem router is almost always a NAT router sharing a single public IP address between the devices connected to the router e 115 just the same on a 3G 3G mobile IP access the terminals phones or computers access the Internet via NAT routing NAT routing is often included in the firewall features in fact NAT routing somewhat participates to the protection against direct attacks from the outside 55 000 053 F SCOOP 4 User manual 63 v AETA AUDIO SYS TEMS NAT routing is an obstacle to transmission with UDP mainly for two reasons It does not allow unsolicited data to come in from the outside network In other words data i
8. and provide the audio transmission via the backup network access More precisely on one end of the link the codec will switch to the backup mode and call its counterpart via the ISDN or and IP network On the other end the unit will switch to the backup mode when it receives the call on its ISDN or IP interface The operating mode and configuration for this backup feature are detailed further in following sections 4 10 Setting up a backup link 8 SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS 2 4 Supervision and control interface These functional modules fulfil the control and supervision of the equipment configuration communication management status monitoring thanks to a keyboard an alphanumeric display LED indicators and remote control interfaces The remote control is possible either via a serial data port or through the Ethernet interface with a TCP IP connection In addition the equipment 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 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 and or the st
9. Current Use current setting of unit None No defined coding for this profile Name gt Enter profile name Number1 gt Enter first dial number Number4 gt Enter 4th dial number if existing needed 36 SCOOP 4 User manual 55 000 053 4 4 4 SETUP Network sub menu 425 AETA AUDIO SYSTEMS Notes Net Other to select other network for Leased Line mode Interface Selection of the active port in normal mode T Main port labelled X24 V11 V35 LL2 Secondary port labelled ALARM X24 V11 Normal Normal single codec mode DualCodec Select double G722 codec mode for IP transmission mode Network Setup DHCP Address Mask Gateway DNS Network Quality Selection of the preferred LOW stability latency compromise MIDD i see Setting up a link in IP mode HIGH STUN Mode Activate disable use of STUN OFF UN Multicast Aclivate disable Multicast mode Off N Send Multicast active stream sender mode Rev Multicast active stream receiver mode for ISDN Protocol Selection of local ISDN protocol Euro ISDN i Address Configuration of local line Local Number 1 see Setting up a link in ISDN mode Sub Address 1 Mode Normal 9 Normal single codec mode DualCodec Select double 6711 6722 codec mode 55 000 053 F SCOOP 4 User manual 37 v AETA AUDIO SYSTEMS 4 4 5 SETUP Audio sub menu SETUP I
10. channel aux G711 M 8kHz 3 4 kHz 64 kbit s CELP M 16 7 kHz 24 kbit s 6722 SRT 16 kHz 7kHz 64 kbit s i G722 H221 M 16kHz 7kHz 64 kbit s 6722 242 16 2 7kHz 64 kbit s 458 ADPCM M 32kHz 15 kHz 128 kbit s 458 5 32kHz 15 kHz 256 kbit s 16kHz 7kHz 64 kbit s 16kHz 7kHz 128 kbit s 24kHz 10 kHz 64 kbit s 24kHz 10 kHz 128 kbit s MPEG T 32 kHz 15 kHz 64 kbit s Layer II 32kHz 15 kHz 128 kbit s 32 kHz 15 kHz 192 kbit s 48 kHz 20 kHz 64 kbit s 48 kHz 20 kHz 128 kbit s 48 kHz 20kHz 192 kbit s 16 kHz 7 kHz 64 kbit s 16 kHz 7 kHz 128 kbit s 24kHz 10 kHz 64 kbit s 24kHz i 10kHz 128 kbit s 32 kHz 15 kHz 64 kbit s 32 kHz 15 kHz 128 kbit s MPEG ccm 32 kHz 15 kHz 192 kbit s Layer 32 kHz 15 kHz 256 kbit s 32 kHz 15 kHz 384 kbit s 48 kHz 20 kHz 64 kbit s 48kHz 20 kHz 128 kbit s 48kHz 20kHz 192 kbit s 48kHz 20kHz 256 kbit s 48kHz 20kHz 384 kbit s 32 kHz 15 kHz 16 to 192 kbit s MPEG 48kHz 20 kHz 16 to 192 kbit s AAC LC 32kHz 15 kHz 16 to 192 kbit s 48kHz 20kHz 16to 192 kbit s 32 kHz 15kHz 16 to 64 kbit s 48kHz i 20kHz 16to 64 kbit s HE AAC 32kHz 15 kHz 16 to 128 kbit s 48 kHz 20kHz 16 to 128 kbit s MPEG 32kHz 15kHz 16to 64 kbit s HE AAC v2 A8kHz 20kHz 1610 64 kbit s TDAC M 32kHz 15 64 kbit s Table 2 Possible values for configu
11. e complete loss of the X24 V11 interface due to a failure of the transmission line e a failure of the transmission device connected to the codec e an 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 lack of signal received from the X24 V11 interface due to a failure of the transmission device connected to the codec or a transmission failure in the network e a fault in the remote codec or else the remote codec has an incompatible configuration e transmission errors causing erratic alarms Errors such as AES error and AES sync loss can frequently be seen even when the unit is configured to use the analog inputs This is because the AES output is always active and by default genlocked to the AES input To avoid such undesired alarms When not using digital audio interfaces set the digital audio sync in Master mode SETUP Audio Digital Synchro Master 55 000 053 F SCOOP 4 User manual 31 v AETA AUDIO SYSTEMS 4 Detailed operating mode User interface In local mode the unit is operated thanks to a keyboard and display on the front panel The display is an alphanumeric backlit LCD with two 20 character lines Operating from the keyboard can be protected by a password 8 digits maximum In such case the password must be entered to start a session and get a
12. leased line mode The connectors are 15 point male Sub D type In the standard single codec mode only one port is used This is normally the main port X24 V11 V35 but it is possible to select the other port In the dual codec mode both ports must be used In this mode audio channel A is transmitted on the main port X24 V11 V35 and audio channel B is transmitted on the additional port labelled ALARM X24 V11 Alarm indicator and contacts This ALARM X24 V11 port also includes two form C relays providing isolated contacts which can signal alarm conditions e Internal alarm contact e External alarm contact A red LED indicator also indicates that an alarm relay is activated In the factory setup every alarm cause sets the LED on but by setting jumpers on the motherboard it is possible to program the indicator to react to only one type internal or external alarm The pin out of the socket and the detailed characteristics of the alarm relays can be found in chapter 5 1 6 Alarm 24 21 interface p 51 USB socket This host USB port is currently not used 18 SCOOP 4 User manual 55 000 053 F AETA AUDIO SYSTEMS Rear panel Figure 3 19 SCOOP 4 User manual 55 000 053 F 425 AKTA AUDIO SYSTEMS Remote control Remote This 9 pin female sub D socket is an asynchronous serial interface port usable for remote controlling the
13. response to STATUS ENQUIRY normal unspecified no circuit channel available 26 38 network out of order temporary failure 2A 42 switching equipment congestion 2B 43 access information discarded 2C 44 requested circuit channel not available 2F 47 resources unavailable unspecified 31 49 quality of service unavailable 32 50 requested facility not subscribed bearer capability not authorized 2 9 3A 58 bearer capability not presently available F 3F 63 service or option not available unspecified 41 65 bearer capability not implemented 42 66 channel type not implemented 45 69 requested facility not implemented 46 70 only restricted digital information bearer capability is available 79 service or option not implemented unspecified continued on next page 68 SCOOP 4 User manual 55 000 053 F Chess AETA AUDIO SYSTEMS Code Meaning 51 81 invalid call reference value 52 82 identified channel does not exist 53 83 a suspended call exists but this call identity does not 54 84 call identity in use 55 85 no call suspended 56 86 call having the requested call identity has been cleared 58 88 incompatible destination 5B 91 invalid transit network selection 5F 95 invalid message unspecified 60 96
14. then load this updated profile set into the Scoop4 However this is just one example among many ways of using Profile Manager 40 SCOOP 4 User manual 55 000 053 F Chess AETA AUDIO SYSTEMS 4 6 Setting up a link in ISDN mode 4 6 1 Preliminary setup The network interface must be configured depending on the local ISDN line that is used Protocol First the protocol should be set appropriately SETUP Net Param Protocol The default setting is Euro ISDN also known as ETSI protocol Change this setting if another protocol is needed in your location Local address In some cases it may be necessary to set the local address or local ISDN number of the line and or it is possible to assign a sub address to the codec The local number allows multiple subscriber numbering or MSN This number is usually the number remote equipment must dial to call your equipment Configuring this number in the equipment is not mandatory if the equipment is directly connected to the public network On the other hand if the equipment is connected to a PABX the number s are often required The PABX may also impose a unique number for each B channel within the same BRI interface In such a case refer to the characteristics and configuration of the PABX Proper configuration of the local numbers is essential and many problems in setting up links originate from mistakes or misunderstandings regarding this c
15. DI E ee 28 58 64 67 Sub address sss 32 33 41 Supervision 2 8 9 13 20 23 31 59 Synchronisation 4 5 8 21 23 30 60 70 T 2 8 9 20 24 2 4 5 6 59 60 TOES COOP 13 59 72 SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS 55 000 053 F W 2 7 8 24 28 X X21 X24 SCOOP 4 User manual 73
16. Ethernet interface 3 4 3 Notes about the use of AES EBU interfaces When using digital audio interfaces it must be decided whether the codec is master or slave regarding audio sampling clock synchronisation In the first case the codec derives the sampling clock from the network clock or an internal source and the device s connected to the codec must synchronise to the same clock source The most common choice is rather the slave mode to be used when it is not possible or not desired to synchronise the external equipment onto the clock of the transmission link or the codec In this case the AES EBU interfaces should be set in the so called genlock mode When in this mode the codec derives the sampling clock of the digital audio interfaces from its AES input in other words is gen locked onto the incoming AES signal and sampling rate conversion SRC is used for interfacing to the coding parts V tis mandatory in such situation to provide the codec input with an AES signal featuring the same sampling frequency as the external equipment even if the codec is used only as a decoder If this requirement is ignored the unit will actually fall back to master mode In such situation clicks in the audio programme might be heard especially when the resulting sampling rate is very different from that of the external device If on the contrary it is decided to synchronise the external equipment at 32 4
17. SYSTEMS 6 2 Overview of the SIP protocol 6 2 1 What is SIP SIP is for Session Initiation Protocol a protocol specified by the IETF for establishing media transmission sessions SIP is considered the communication protocol of the future by most vendors and as such it has deep influence on the VoIP applications As a signalling protocol SIP brings methods and techniques to solve the issues related to the establishing of an audio link Almost as important it is a recognised standard implemented on many network devices and systems Using SIP helps you build modular and really evolutive systems not being tied to a single vendor The SIP protocol is an essential requirement in EBU Tech 3326 recommendation a k a N ACIP recommendation 6 2 2 Setting a link with SIP Let us look at an example diagram below a reporter on the move with a Scoopy wants to make a call to a SIP compliant codec located in the main station The reporter may be at home or at another location not necessarily known in advance Once the Scoopy is on and connected to the network it will register itself 0 to a SIP registrar This registrar can be located on the LAN of the radio house but it may as well be elsewhere in the network Then the registrar knows where the Scoopy is what its IP address is On the radio house side similar process takes place To call the codec of the radio house e g a SCOOP 4 the reporter just need
18. User 1006 Display name 1006 Registrar 10 0 50 120 Authentication User 106 Authentication Password eeeeee Registration Status registered NAT Firewall traversal Outbound proxy STUN server STUN mode of SAVESIP REFRESH gt A aa el ne BB n aaea eh ee 55 000 053 F SCOOP 4 User manual 27 425 AKTA AUDIO SYSTEMS Item Notes User Display name Refer to the network administrator and or the administrator of the SIP server Authentication user Often these three parameters have the same value as here but they may be different Authentication Refer to the network administrator and or the administrator of the SIP server password Registrar IP address of the SIP registrar a symbolic name e g sipsrv mycomp com is accepted if recognised by the DNS Can be also read from the menu TOOLS Maintenance About Registration status Shows that the unit is or is not successfully registered on the server read only data Can be also read from the menu TOOLS Maintenance About Outbound proxy An outbound proxy is one way of getting access through a NAT router or a firewall Refer to the network administrator and or the administrator of the SIP server for this setting STUN server A STUN server is also one means of getting access through a NAT router If such server is available enter here its IP address or domain name Examples of usable STUN servers
19. WAN including links via Internet The SCOOP 4 implements the SIP protocol which allows it to interoperate with IP phones and other SIP compatible audio codecs in a way similar to ISDN or POTS connections Links can be set up in two ways e Peer to peer connection between two compatible units e Use of a SIP proxy server to set up the link or a SIP PBX Details about the SIP protocols can be found in the annex refer to 6 2 Overview of the SIP protocol The audio coding algorithm can be selected depending on the required quality and the available network bandwidth The following algorithms are currently available Codec Bit rate Bit rate Audio Typical use main features coding total bandwidth G711 64 kbit s 86 kbit s 3 kHz Voice telephony Compatible with IP phones CELP 24 kbit s 28 5 kbit s 7 kHz Suitable for high quality speech Low network bandwidth consumption G722 64 kbit s 86 kbit s 7 kHz High quality speech MPEG Layer 640r 128 83 to 147 up to Highest quality suitable for speech and kbit s kbit s 20 kHz music MPEG AAC LC 164192 30 to 213 up to Low bit rate suitable for speech and kbit s kbit s 20 kHz music MPEG HE AAC 16to 128 23 to 139 up to Very low bit rate suitable for speech and and HE AAC v2 kbit s kbit s 20 kHz music 4SB ADPCM 64 or 128 173 or 15 kHz Low latency suitable for speech and kbit s 301 kbit s music IP multicast mode The multicast mode al
20. can be found on the Support page of our web site http www aeta audio com STUN mode Enable or disable the use of the STUN server This allows to keep the address of the STUN server even when the function is disabled This setting is available from the menu SETUP Param STUN Mode Make sure to click the SAVE SIP button located at the bottom of this section if you want to actually write your changes into the SCOOP 4 For the operation in SIP unicast mode make sure to leave the Codec mode setting top of the page on the SIP position The registration data do not have to be changed often in normal operation In fact they may be still valid even after the unit moves to another location even though its IP configuration changes 3 6 2 Settings for multicast mode To use the multicast mode first select the appropriate mode on top of the page e Multicast send if the unit has to be the source of the program to be multicast Multicast receive if the unit will be receiving the multicast program Some complementary settings may be done for this mode The default settings can be suitable but for network management issues it may be needed to force specific values To do that go to the Multicast section of the html page e Control port this is UDP port multicast used to send the audio stream description If this field is left blank its defaul
21. manual an operator on the studio side can switch the studio codec to ISDN IP mode and launch a call to the other site via the backup medium For this method no special preliminary setting is needed e The other method is to use the loop control feature as described above in section 4 9 In this case the whole switchover sequence can be executed by simply activating the input loop Conversely releasing the input loop brings the unit back to normal operation in LL mode For this latter method 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 55 000 053 F SCOOP 4 User manual 47 425 AKTA AUDIO SYSTEMS In order to use this operating mode two settings have to be done on the caller codec e Select the network to use for backup menu TOOLS Miscellaneous LL Backup Backup Call e Activate the loop controlled backup menu TOOLS Miscellaneous Loop Control Backup Important notice when switching to backup mode the number called is the last dialled For this reason it is important to dial and call the backup destination in the desired mode at least once before setting the unit in its n
22. network access Use of a SIP server In addition to the numerous features it brings along using a SIP proxy server is a very powerful method to solve the issues related to NAT routers because most SIP proxies are capable to detect the presence of NAT routers and or deal appropriately with their traversal If a SIP server is available and once the codecs are registered on this server e Any registered codec can call another registered codec regardless whether there is or not a NAT router on the path e The identifier SIP URD is stable and does not depend on the location of the called agent mobility feature It is possible either to use a public server on the Internet or to install a private server accessible via the Internet Advantages Drawbacks Each codec can initiate a session Installation may not be easy private Each codec can receive calls server Identification is simple and location time wise Reliability of server questionable public stable server Security a private proxy can be linked with a firewall Also works with symmetric NAT routers Interoperation with telephony over IP Method suitable for mobile network access 1 Depending on the access control policy a server may accept outgoing calls to third party domains or accept incoming calls from non registered agents 66 SCOOP 4 User manual 55 000 053 F 6 3 3 Summar
23. 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 G722 H221 H242 MPEG Audio 4SB ADPCM 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 In IP transmission mode this function is available whatever the selected coding In LL or ISDN mode this function is only available when the main audio programme is encoded in G722 H242 ISDN mode MPEG excluding the proprietary ISDN mode or ADPCM When using MPEG coding relay transmission can be activated along with other auxiliary functions For G722 or ADPCM relay transmission is activated in place of the data channel typical application is the transmission of an air signal the contact closure may be used for e g switching on a lamp or starting other devices 55 000 053 F SCOOP 4 User manual 11 425 AKTA AUDIO SYSTEMS 2 6 3 Coordination cha
24. protection of only the control information and scale factors in the MPEG frame low redundancy so called unequal protection e Mode 2 protection of the whole frame moderate 2 5 redundancy so called low equal protection e Mode 3 protection of the whole frame high 10 redundancy so called high equal protection Higher redundancy increases the protection against errors but slightly degrades the audio quality as redundancy takes up part of the bit rate that could be allocated to audio coding Most often for a normal quality transmission link mode 1 is sufficient and it consumes little bit rate from the compressed data so it hardly impacts the audio quality Although J52 does not apply to leased line connections this error protection technique is also implemented in the SCOOP 4 in leased line mode 6 1 3 H221 framing H221 defines a framing structure that allows byte synchronisation recovery in leased lines and the transmission of control data along with the main data 6 1 4 Proprietary coding algorithms The proprietary coding algorithms are algorithms which are not standardised by the ITU T but have distinctive features that make them useful for some applications e Low coding decoding delay 4SB ADPCM e Low bit rate wide band speech coding CELP e TDAC Time Domain Aliasing Cancellation MDCT based algorithm 60 SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO
25. the unit is powered on Local mode operation is described in detail in chapter 4 Detailed operating mode Thanks to the remote control mode the codec can be operated from a computer with supervision software The supervision station is a PC computer running Windows equipped with the Scoop4Man configuration and monitoring software This software gives full access to the codec functions configuration audio link management and status monitoring with a graphical interface Scoop 4 can also be controlled by the optional software TeleScoop which can control the other AAS codecs of the Hifiscoop Scoop 3 and Hifiscoop 3 ranges Details about this supervision software can be found in the documentation and user manual of the TeleScoop software In addition to this some parameters related to the Ethernet IP interface and transmission can be set by using an embedded HTML server these are described further in 3 6 Use of the embedded html server For controlling connections in ISDN or IP 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 isolated 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 a
26. the SIP URI of the unit to call and press the green phone button It is often possible to dial the short form username omitting the sipservername when the device is itself registered onto the same sipservername server 4 7 3 Receiving calls This is very simple in both cases direct peer to peer link or SIP server There is nothing to do When a call is received the units negotiate automatically a commonly acceptable coding algorithm and set the link automatically On the receiving side the unit will follow the calling unit Important notice the unit can receive and accept incoming IP calls even when it is set in ISDN mode On the other hand it will ignore such calls if it is running in LL mode except if the Backup receive mode is active for details see below 4 10 Setting up a backup link 55 000 053 F SCOOP 4 User manual 43 425 AKTA AUDIO SYSTEMS 4 7 4 Network quality setting Depending on the quality of service provided on the network especially its jitter performance it is possible to change the stability latency compromise used by the Scoop 4 For this purpose a setting is available in the menu SETUP Network Param Network Quality Three choices are proposed e HIGH suitable for a good quality and low jitter network latency is minimal but the codec will have little tolerance to possible jitter e MIDDLE intermediate and default sett
27. to be preferred especially when operating the unit only from remote via IP Warning files transferred this way are devised for backup but they are not portable from one firmware version to the other 55 000 053 F SCOOP 4 User manual 29 v AETA AUDIO SYSTEMS 3 7 First level maintenance 3 7 1 Internal description To be added later 3 7 2 Internal configuration All the configuration is done in the factory and or it can be changed by means of the keyboard display interface without having to open the unit However a few settings can be done internally by setting jumpers e It is possible to prevent one alarm type to light on the red alarm LED on the back of the equipment e 15 possible to disable the standby mode in which case the device is always in operation as long as the mains power is present Please consult us for such operation We remind that unduly opening the unit can void the warranty In any case opening the unit may expose live parts and is hazardous Never open or maintain the internal parts without first disconnecting the AC supply 3 7 3 Analysis of malfunctions The following table indicates the detected alarm conditions and their classification Bad startup of microprocessor or X interface fault detected on start up Overload on an audio input Fault on AES EBU audio input Decoder synchronisation error Network clock fault Table 3 List and cla
28. 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 resp IP can be released and normal operation in LL mode is restored Studio Transmitter The SCOOP 4 makes such back up easy because both transmission interfaces normal leased line and backup interface ISDN or IP are available in the same unit Moreover the SCOOP 4 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 configuring such a system and details the resulting backup process Audio Leased line 4 10 1 Basic principles When a failure of the leased line is detected one of the two codecs has to switch to ISDN resp IP backup mode and then call the other unit over the backup network access The audio transmission in then provided over the backup link Later on when the leased line comes back to normal the backup connection can be released and both codecs have to switch back to LL mode and normal operation We designate as caller the codec which switches first and initiates the call over the backup network and receiver the codec which switches on receiving such a backup call 4 10 2 Caller codec setup and operation For the switch to backup following a failure on the leased line two methods can be used e Either the switchover is
29. 8 or 96 kHz onto the transmission clock of the leased line interface the codec must be configured in master mode In this case the output is locked onto this clock and it can be used as a reference to synchronise the equipment connected to the codec output The digital audio signal at the codec input must then come from a device synchronised by this way 55 000 053 F SCOOP 4 User manual 23 v AETA AUDIO SYSTEMS v When you do not use the digital audio interfaces the master or slave mode has no effect on the actual operation However it is recommended in such case to select the master mode to avoid undesired alarms Otherwise with the genlock setting which is the default factory setting an alarm is raised because of the lack of a suitable signal on the AES input In the master mode the device ignores this error condition 3 5 Initial setup of the Ethernet interface The SCOOP 4 includes a 100BaseT 10BaseT Ethernet interface and the audio transmission can take place over an IP network through this interface In addition it is always possible to use the Ethernet interface for remote controlling the unit via a TCP IP connection TCP port 6000 For IP unicast audio transmission SCOOP 4 uses the SIP protocol which eases the setting up of a link The operation is similar to setting a call over the ISDN or PSTN The transmission can be done in two modes e Direct peer to peer transmis
30. A is configured for using a STUN server e codec A can initiate a connection to call codec e codec B can call codec A using the public address of the NAT router Advantages Drawbacks Each codec can set up a session Need to configure the router A is nearly equivalent to a codec with a Only one codec can be set up in this way on a LAN direct public access A is exposed to external attacks The DMZ may be already reserved for other network equipment Method not possible for a mobile network access NAT router with port forwarding Situation codec A behind a NAT router and configuration of the router to forward to A the necessary ports We also assume that the other codec B is accessible with a public address Port forwarding to be set on the router e UDP 5060 SIP port UDP 5004 RTP port and 5005 RTCP port 1 For Scoop4 versions before 1 32 ports 9000 and 9001 respectively 55 000 053 F SCOOP 4 User manual 65 v AETA AUDIO SYSTEMS Once codec A is configured for using a STUN server e codec A can initiate a connection to call codec e codec B can call codec A using the public address of the NAT router Advantages Drawbacks Each codec can set up a session Need to configure the router A is nearly equivalent to a codec with a direct Only one codec can be set up in this way public access on a LAN Method not possible for a mobile
31. IO LL IP ISDN 4B with digital leased line interfaces Ethernet interface and two ISDN interfaces The following table shows the main features of the product Functions marked with in this table are available as options Functions marked with O are only available in the versions equipped with ISDN interface s One outstanding feature of AAS codecs in ISDN mode is the 5A System on receiving an incoming ISDN call the unit can automatically detect the coding algorithm and parameters of the calling codec and then adjust itself in a compatible configuration so that the connection succeeds regardless of the initial configuration and that of the remote unit In IP mode the codec features the same ease of operation thanks to the use of the SIP and SDP protocols The standard operation mode is the single codec mode where the unit can be connected to a remote codec using any one of the listed coding algorithms In the dual 7 kHz codec mode available for leased line transmission the equipment is equivalent to two independent mono codecs each running G722 over a 64 kbit s leased lines Such a dual codec mode is also available for ISDN transmission in this case the equipment is equivalent to two independent mono codecs each running G711 or G722 over one B channel of the ISDN interface 5AS Aeta Audio Advanced Automatic Adjustment System 55 000 053 F SCOOP 4 User manual 1 AKTA AUDIO SYSTEMS Char
32. IO SYSTEMS 4 6 3 Receiving calls When the 5A System is active receiving calls is simple When a call is received the codec automatically unhooks and recognises the coding algorithm and protocol used and finally set the link automatically On the receiving side the unit will follow the calling unit When the 5A System is not active you should first configure the codec for the desired coding algorithm and configuration When a call is received the unit will synchronise with the calling device but the link will usually fail if the calling party has used another coding configuration than expected However if J52 is used by both parties the link will succeed even without 5AS active Important notice the unit can receive and accept incoming ISDN calls even when it is set in IP mode On the other hand it will ignore such calls if it is running in LL mode except if the Backup receive mode is active for details see below 4 10 Setting up a backup link 4 6 4 Quick redialling Once a number or a couple of numbers has been called it is easy to recall it without having to type it again press the green phone key then you can scroll through the history last dialled numbers using the arrows Press the phone key when the desired number is displayed This is especially useful for quickly redialling the previous number 42 SCOOP 44 User manual 55000 053 F 425 AETA AUDIO SYSTEMS 4 7
33. L license it can be obtained on request by e mailing AETA AUDIO SYSTEMS 55 000 053 F SCOOP 4 User manual 71 v AETA AUDIO SYSTEMS 6 7 Index 4 ASB ADPCM eee eene 4 11 60 5 DAS LM E 1 2 6 42 48 A 2 4 7 2 3 18 21 23 24 30 31 50 Alarm seere 9 15 18 23 24 30 31 47 51 B 1 T 8 42 43 47 48 C 2 4 7 12 60 cei tie teet ete totes 3 8 23 30 31 51 70 Coordination 2 12 20 54 57 58 59 Crosstalk 57 Data channel 2 11 12 20 21 52 60 PCR D EE sette 52 70 DHCP 24 25 6 57 DMA 65 Dual 1 18 21 32 46 48 70 EI E ONE 59 Factory settings 23 24 29 32 40 Firewall eret tette teen tette 28 43 63 G TER 1 2 4 7 44 GD ea ee Em 1 2 4 5 6 7 8 11 12 44 61 TT 3 23 24 50 GPL LGP 71 Group delay eee tede coves ren eet ier 57 H eese etae 2 4 5 11 21 60 2 4 5 11 12 Headroom 17 I Inipedance 50 54 ISDN e E E 41 68 FE TT 32 33 41 46 J TTT 4 5 6 42 60 L Local address eeeeeeeee n
34. Setting up a link in IP mode A link is set up in a similar way as an ISDN link The difference is mainly that instead of the telephone number we use either an IP address or a SIP URI Uniform Resource Identifier 4 7 1 Directly call an IP address This is the most basic way of setting the link It is suitable only if e The other unit is directly reachable i e there is no NAT Router or firewall blocking the connectivity The simplest case is when both units are on the same LAN e The IP address of the other unit is known To set the link first set the unit in IP mode menu SETUP Net IP and set the desired encoding format SETUP Cod Note that you can get a fast setting by simply selecting one of the recently used configurations displayed Then enter the IP address and press the green phone button When operating in this way it is preferable to leave blank the SIP registering data 4 7 2 Calling via a SIP server This is the technique when both units are registered on a SIP proxy server In this case each unit is identified by its SIP URI in the form username sipservername like an email address There is no need to know any IP address and hence there is no problem if the IP address of a unit changes for whatever reason To set the link first set the unit in IP mode menu SETUP Net IP and set the desired encoding format embedded server or simply from the keypad SETUP Cod Then enter
35. Worst case for all types of algorithms MPEG performs better than the others 55 000 053 F SCOOP 4 User manual 57 v AETA AUDIO SYSTEMS 5 3 Network protocols and ports The Scoop 4 implements or complies with the following protocols non exhaustive list e Physical and link layers Ethernet 100BaseT 10BaseT e Network Transport layers IPv4 TCP IP UDP IP RTP IP e Application HTTP Telnet DHCP STUN e Audio transmission SIP signalling SDP RTP RTCP RFC3550 3551 RFC3640 e Compliant with EBU recommendation Tech 3326 interoperability of audio codecs for contribution The ports used by the device are the following Type Port D signation Notes 80 HTTP Embedded html server TCP 6000 Control Remote control command line mode used by Scoop4Man and TeleScoop 3478 STUN For querying a STUN server optional 5004 RTP For audio streaming 5005 RTCP For audio streaming UDP 5060 SIP SIP signalling 6000 Multicast description Multicast stream description channel 6001 Multicast audio Multicast stream transmission channel The ports for multicast mode can be changed from the default values in the above table 5 4 Power supply The codec operates from mains 85 263Vac 47 63 Hz Protection is provided by a resettable fuse The maximum power consumption is 15 W without the coordination channel option A product version is available which is
36. acteristics Optional Operation modes Single wide band codec Dual 7 kHz codec LL mode or ISDN mode IP transmission interface Ethernet interface 1OBaseT 100BaseT TCP IP and UDP IP protocols Audio transmission in unicast mode SIP signalling protocol SDP protocol Audio transmission in multicast mode 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 ISDN transmission interface One or two SO interfaces U interfaces available for North America 5AS automatic setting for incoming calls Audio coding algorithms audio modes G711 standard telephone Mono G722 SRT H221 H242 Mono CELP 7 kHz IP mode only Mono MPEG Audio Layer II Mono Stereo Dual mono Joint stereo MPEG AAC LC Mono Stereo MPEG HE AAC HE AAC v2 Mono Stereo 4 sub band ADPCM low latency M S TDAC ISDN mode only M Available bit rates depending on coding algorithm Leased line transmission 64 to 384 kbit s over one line or 2x64 kbit s over two lines IP transmission 16 kbit s to 256 kbit s ISDN 64 to 256 kbit s transmitted via one or two interfaces 1 to 4 B channels Audio interfaces Two analogue inputs and two analogue outputs with adjustable level Digital audio input and output AES EBU format Auxiliary functions Data channel 300 to 9600 bauds Relay transmission 2 isolated in
37. ations in bit rate depend on the transmission mode the equipment version and the software version This is especially true for MPEG coding 55 000 053 F SCOOP 4 User manual 39 425 AKTA AUDIO SYSTEMS 4 5 Handling the configuration profiles The configuration profiles make it easier to change the configuration or set up routine calls Each memory or profile includes the following fields e Name allocated to the profile e Number s ISDN dial number SIP URI or IP address depending on transmission mode e Associated coding A profile may not include a number in such case it is used for quick and safe recall of a given coding configuration Conversely a profile may not include an associated coding configuration in such case it is just like a directory entry used for instant dialling a known destination The configuration profiles are managed and used via the DIR menu see 4 4 3 which provides the following choice e Load Call after browsing the ordered list vertical arrows the selected item can be called directly by pressing the dial key otherwise on pressing the coding configuration is loaded without launching a call by typing a letter you can directly reach this letter in the profile list the horizontal arrow allows you to look the profile parameters name number coding e Delete of course this is for erasing a profile after browsing the list Press OK when t
38. audio stream has to be distributed simultaneously to several destinations Contrary to the normal bidirectional unicast mode this mode is unidirectional one sender encoder sends a stream towards a multicast group address and one or several decoders receiving the stream pick up the packets sent to this group address and decode the audio stream On the Scoop 4 the operating mode stays quite similar to the normal mode with mainly two differences in the multicast mode codec must be set as sender or receiver device e SIP is not used and hence the SIP configuration is not relevant For the operation it is assumed the network statically supports UDP multicast i e routers of the network recognise and deal with routing the packets with multicast group addresses 1 This does not include the Internet multicast cannot be used over the Internet 44 SCOOP 44 User manual 55000 053 F 425 AETA AUDIO SYSTEMS For obvious reasons the coding setup is entirely decided at the source On the codec on the audio source side hence sender of the encoded stream the procedure for setting up a multicast stream is the following e Set the codec in multicast send mode e Select on this codec the desired audio coding parameters e Start the streaming as for setting up a call in normal mode enter the IP group address then press the key Note that the codec decodes its own stream on its audio output this ca
39. call can be done from the station to the reporter in a way very similar to the above In contrast with ISDN links the operators at the station do not even need to know where the reporter is located This is because the registrar deals with this issue Note that it is also possible to set a link with a SIP compliant VoIP phone instead of another codec This is one of the numerous advantages of using a standard 1 Scoopy is a portable audio codec from AETA AUDIO SYSTEMS the description here applies to both Scoopy and the Scoop 4 as they are both SIP compliant and mutually compatible 55 000 053 F SCOOP 4 User manual 61 LA S AETA AUDIO SYSTEMS SIP proxy server Gateway Gateway SIP IP codec E registrar Oe Qe Scoopy with IP interface 62 SCOOP 4 User manual 55 000 053 F Chess AETA AUDIO SYSTEMS 6 3 Some methods to deal with NAT routers and firewalls Problems arise when the desired connection has to go through a NAT router and or a firewall that blocks a direct IP communication This is a very common issue especially if one needs to set up a transfer via the Internet It is impossible here to describe in details the possible ways to deal with this problem but the following just shortly discusses so
40. ccess to the user menus The password can be changed or deleted by the user 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 three transmission modes transmission over Ethernet IP leased line mode and transmission over the ISDN In comparison with the permanent leased line connection IP and ISDN modes are dial up modes and bring a number of additional parameters to be controlled e dial number and or full SIP URI for the destination of a call e call set up and control e device SIP registration data or local ISDN number and sub address e miscellaneous network operation parameters The status display is slightly different in order to recall the transmission mode currently in use Second in the leased line mode or ISDN mode the unit can be operated either as a normal single codec or as a dual codec capable to transmit two independent 7 kHz bandwidth audio channels This aspect has a big influence on the way the device is installed set up and monitored In the following the main operation modes are shortly designated IP mode ISDN mode or LL mode for leased line mode and Single codec or Dual codec 4 2 Equipment start up During start up the unit displays temporary messages This initialisation lasts around one minute Then the main menu is displayed At this stage i
41. cy of the analogue lt gt digital converters depend on the operating mode The equipment also provides digital audio inputs outputs in AES EBU format The input to the encoder is selectable between the digital audio input and the analogue stereo input The output from the decoder is sent both to the digital output and the analogue stereo output The digital audio interfaces are usually locked to the digital audio input genlock mode but alternatively they can be synchronised to the internal clock reference of the codec Having the digital samples from the audio interfaces analogue or digital sample rate conversion is fulfilled whenever needed to get audio data at the coding frequency F which is depending on the coding type 16 24 32 or 48 kHz 55 000 053 F SCOOP 4 User manual 3 v AETA AUDIO SYSTEMS 2 2 Encoding and decoding In the normal single codec mode the codec readily includes a wide range of coding algorithms First one can select among algorithms compliant with ISO and ITU T recommendations e G711 IP or ISDN mode only e ITU T G722 mono at 64 kbit s e MPEG Audio Layer II at 48 32 24 or 16 kHz with programmable channel mode and bit rate e MPEG AAC LC at 48 or 32 kHz programmable channel mode and bit rate available as an option for IP and ISDN modes e MPEG HE AAC and HE AAC v2 at 48 or 32 kHz programmable channel mode and bit rate available as an option for IP and ISDN m
42. e Open logfile button e Or by downloading it thanks to the Save logfile as button Events are time stamped month day hour minute second with the internal clock This clock is not real time no battery in the unit but the codec is capable to synchronise at boot time with a time server using the NTP protocol If such server is available and accessible via the Ethernet interface enter its address in the NTP server field on top of this section then click the Save button A few public servers are proposed as well in the drop down list besides NTP server Important the date is universal time UTC and it does not take into account the geographic location or possible DST 3 6 6 Setup transfer section It is possible to backup all the settings of the unit in a file complete snapshot and conversely restore a complete setup from a file previously backed up in this way This section allows to handle such file transfers between the codec and a computer used for html browsing e Save complete configuration file allows to download the complete current setup of the unit in order to save it into a file on the computer e Load complete configuration allows the reciprocal process for restoring the complete setup from a backup file up to the codec e Load configuration without IP settings fulfils almost the same function but without acting on the IP addressing This is often
43. ed relatively to digital full scale the reference level can be set in the menu SETUP Audio Level Meter HEADROOM The OVLD LED at the right end of each bar shows when the signal reaches maximum digital level or clipping level regardless of the reference level setting v always reacts to absolute full scale level while the bargraph level indication depends on the reference level setting The HEADROOM setting in the menu defines in dB the difference between the maximum level or digital full scale and the reference level for which 0 dB is displayed on the level meters Here are some examples e If the headroom is set at dB then the maximum displayed level is 0 dB note that OVLD will light on whenever the signal reaches this level or exceeds it on the analogue input e If the headroom is set at 10 dB then 0 dB is displayed when the signal is 10 dB below maximum level or 10 dBFS The display in such case can reach up to 5 dB OVLD lights up when the signal reaches maximum level but not before The audio signals can also be monitored with a headphone connected on the front panel 1 4 or 6 35 mm stereo jack The headphone volume is adjustable thanks to a potentiometer and the source select key toggles the listening between transmission Tx indicator or reception Rx indicator Actions dealing with this area connecting or disconnecting the jack Tx Rx selection volume adjustment never affect
44. ed data lt Received data gt Transmitted data gt Transmitted data 1 Frame ground 6 5 2 Optional connections 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 In the single codec mode the state of the I signal has no effect on the codec operation 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 70 SCOOP 4 User manual 55 000 053 F 6 6 Notice regarding open source code 425 AETA AUDIO SYSTEMS The software of this product includes programs and libraries that are covered by the GNU General Public License or GPL available for example at following address http www gnu org licenses gpl txt Under this license the source code for concerned elements is available on our Internet site Download page otherwise open source Q aeta audio com The software also includes the sipX stack covered by the LGP
45. ed 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 1 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 When loop control is active the input loops are the only means of setting up an outgoing call setting a call from the menu is not allowed v Remind that the first step is to set up the link once in normal mode and later activate the loop control mode afterwards the input loop is used to trigger a redial to the previous ISDN number or SIP URI 46 SCOOP 4 User manual 55 000 053 F Chess AETA AUDIO SYSTEMS 4 10 Setting up a backup link The SCOOP 4 has the capability for backing up a permanent leased line audio link thanks to an ISDN connection or an IP 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 or an IP network In this way transmission via the ISDN or respectively IP can be
46. ed products The SCOOP 4 is delivered with a mains cord and a CATS5 Ethernet cable Along with the coordination channel option a specific cable is delivered which provides XLR plugs for the coordination channel input and output input on a female plug output on a male plug For remote controlling SCOOP 4 units from a PC the Scoop4Man configuration and supervision software is available for a Windows computer The TeleScoop supervision software is also available and allows to control the other rackmount codecs of the Hifiscoop Scoop 3 and Hifiscoop 3 ranges please consult us 55 000 053 F SCOOP 4 User manual 59 425 AKTA AUDIO SYSTEMS 6 Annexes 6 1 Complements on the algorithms and protocols used 6 1 1 Auxiliary data in the MPEG frames The auxiliary data are used for the following purposes e Reed Solomon error detection and correction J52 standard e Data channel e Other auxiliary information relay transmission and or auxiliary audio channel The insertion of this auxiliary information is an extension AAS proprietary format to MPEG However the frame structure remains compliant 6 1 2 Reed Solomon encoding In order to cope with possible transmission errors in the network Reed Solomon error correction coding can be added compliant with J52 recommendation Four correction modes are available in the SCOOP 4 e Mode 0 no error correction Reed Solomon coding disabled e Mode 1
47. encoding a 15 kHz bandwidth mono signal at a 64 kbit s bit rate Some specific product versions also include asymmetric modes e G722 TDAC G722 encoding TDAC decoding running both in mono at 64 kbit s TDAC G722 TDAC encoding G722 decoding with SRT running both in mono at 64 kbit s this mode is symmetric to the previous one 1 J52 is only relevant for ISDN connections 55 000 053 F SCOOP 4 User manual 5 425 AKTA AUDIO SYSTEMS 2 2 6 Symmetric or asymmetric codec modes The codec allows two communication modes Symmetric communication in this mode the encoder and decoder both use the same coding algorithm with the same configuration channel mode etc In this case the communication is strictly symmetric full duplex with exactly the same coding configuration used in both directions local to remote and remote to local This is usually required when using proprietary algorithms 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 G722 in the other one or MPEG stereo in one direction and MPEG mono in the other one etc Specific product versions also allow asymmetric modes wherein one direction is G722 coded while the other one is TDAC coded Such mode is useful e g in order to get a low dela
48. equipment thanks to a control and supervision PC Data This 9 pin female sub D socket is an asynchronous serial interface port usable for transmission of a bi directional data channel refer to 2 6 1 above Data channel Ethernet interface This socket is 100BaseT 10BaseT port used for audio transmission over IP and or for remote controlling the unit via a TCP IP connection TCP port 6000 This RJ45 socket is devised for a normal straight cable to an Ethernet hub or switch The two integrated LEDs show the presence and activity of the network green LED and the interface mode half duplex yellow LED off or full duplex yellow LED on The configuration of the interface is described in 3 5 Initial setup of the Ethernet interface ISDN 1 and ISDN 2 sockets These RJ45 sockets allow the connection to the ISDN for the product versions which include this capability Their layout is standard The sockets must be used according to their number i e 1 must be used if one line only is needed 1 and 2 if two lines are needed Digital I O socket Reserved for future use AUX socket This 25 pin female sub D socket groups the interfaces for the relay transmission function and the optional coordination audio channel It also includes loop interfaces for the loop control function as well as a 5 V power supply that can be used to provide current for the loop and relay interfaces 20 SCOOP 4 Us
49. er manual 55 000 053 F Chess AETA AUDIO SYSTEMS 3 3 Equipment configuration parameters The parameters may be divided into the following categories e Coding configuration parameters which include audio coding type coding frequency and subsequently the nominal bandwidth audio channel mode and transmission bit rate Besides in case of MPEG coding it is possible to select the error protection mode e Configuration of the audio interfaces including selection of analogue or digital format for the audio input maximum level for the analogue inputs and outputs and synchronisation mode for the AES EBU interfaces e Parameters of the auxiliary functions possible activation of a data channel bit rate of this possible activation of the relay transmission possible activation of the auxiliary audio channel if this option is available e Parameters of the network access type of network interface Ethernet IP leased line or ISDN interface parameters etc e Parameters of the keyboard display interface as an example selection of the language for the display messages Chapter 4 Detailed operating mode describes these two last categories The parameters dealing with the audio interfaces are programmable independently from the others On the other hand the auxiliary functions depend on the current transmission mode and coding type The following table is a summary for each coding type of the allowed values
50. etwork and coding algorithm not relevant for LL mode but makes sense for a backup connection activates or not automatic redialling in case the connection is lost on codec 1 activates or not automatic redialling in case the connection is lost on codec 2 use with caution in ISDN mode time to wait before a redial attempt A pulse on the control loop releases a running ISDN or IP connection Outgoing calls are controlled by the control loop state not relevant for LL mode Use control loop to trigger backup call for LL mode backup Concerns ISDN mode only Selection of network for LL backup call Allows the unit to accept an incoming ISDN or IP call 55 000 053 F SCOOP 44 User manual 35 v AETA AUDIO SYSTEMS 4 4 3 DIR menu Notes Load Call Profile 1 Select profile scroll then OK load selected profile Green phone load profile and call Profile n Delete Profile 1 Select profile scroll then OK erase selected profile Profile n Edit 1 Select profile scroll then OK edit selected profile OK Profile n ASSOCIATED COD Edit coding algorithm for this profile No change Keep existing Current Replace for current setting of unit None No defined coding for this profile Name Edit profile name Number1 1 L gt Edit first dial number i Number4 L Edit 4th dial number if existing needed T1 TFT New Le ASSOCIATED COD Coding algorithm for this profile L
51. f the configuration includes a non blank password the keypad is locked and the password must be entered in order to access the menus just enter the password 1 to 8 numbers and the unit is unlocked as soon as the last digit is entered On factory setting or after erasure of the unit memory the password is blank so this step is skipped 32 SCOOP 4 User manual 55000 053 F Chess AETA AUDIO SYSTEMS 4 3 Description of the keyboard The LED indicators and the main function keys are described in 3 2 1 Front panel LCD and basic control keypad In its middle section the front panel includes an alphanumeric keypad used for entering numbers and or texts This keypad is used in a similar way to a mobile phone The keypad works in numeric only mode or in alphanumeric mode where both numbers and letters can be entered In numeric mode only the numbers are used and the key as a separation between ISDN address and sub address The alphanumeric mode is the default mode automatically active whenever this makes sense not for dialling an ISDN number A letter can be entered by pressing repeatedly a key for example a is entered by hitting the 2 key three times sequence 2 A B Use the vertical arrow same key as the sign in order to switch between capital and lower case letters The 1 key is used for various symbols which are not all marked on the keypad
52. face The X24 V11 interface uses a 15 pin male Sub D connector The following table shows the pinout Frame ground 425 AETA AUDIO SYSTEMS Transmitted data Transmitted data Received data Received data Indication Indication Received clock Received clock Electrical ground The codec does not transmit a C signal The codec can also be connected to V35 interfaces a specific adaptation cable is needed in such case The connection is described in Annex 6 5 V35 interface adaptation 5 1 6 Alarm X24 X21 interface This interface uses a 15 pin male Sub D connector The following table shows the pinout Internal alarm Common Transmitted data Ta Transmitted data Internal alarm NC IA C Internal alarm NO Received data Ra Received data Indication Ia Indication Received clock Sa Received clock External alarm NO EA O External alarm NC Electrical ground External alarm Common The bold text refers to the alarm contacts Both are form C type The terminal is open when the alarm is set otherwise it is connected to the Common terminal The NC terminal is connected to the Common terminal when the alarm is set otherwise it is open The current and voltage handling capabilities of the relays static type are Maxim
53. for the various parameters of the coding configuration and auxiliary functions Meaning of abbreviations in the table e Channel mode Mono Stereo JS Joint stereo DM Dual Mono e Coding H221 H221 synchronisation SRT Statistical Recovery Timing e only available on 4B equipment version two ISDN interfaces e FEC Forward Error Correction Reed Solomon error correction Only MPEG can be configured with all three auxiliary functions data auxiliary audio relays For other algorithms each function when available can only be used alone Auxiliary functions are only available for codec 1 when in double codec configuration Regarding the auxiliary functions the table does not apply to the IP mode in which e The data channel and the auxiliary audio are not available e The relays are always available regardless of the coding algorithm used The optional MPEG AAC coding in all its variations is very flexible regarding the bit rate selection in IP transmission mode To preserve readability this table does not give the exhaustive list of all available bit rates However for ISDN transmission only 64 and 128 kbit s are allowed 55 000 053 F SCOOP 4 User manual 21 v AETA AUDIO SYSTEMS Coding Channel Sampling Band Bit rate LL ISDN IP Data Relays Audio FEC mode rate width
54. h allows the SCOOP4 to interoperate with IP phones and other SIP compatible audio codecs in a way similar to ISDN or POTS connections Details about the SIP protocols can be found in the annex refer to 6 2 Overview of the SIP protocol One significant advantage is the inclusion of SDP a protocol which allows the connecting devices to automatically negotiate and agree on the coding profile to use Thanks to this system it is not necessary to set the units in the same way before setting up a connection Moreover the calling party need not know how the remote unit is configured before initiating a link Note the SIP protocol does not mandatorily imply the use of a server Codecs can set point to point links using this protocol and benefit from some advantages of this protocol 6 SCOOP 4 User manual 55 000 053 F Chess AETA AUDIO SYSTEMS 2 3 Transmission interfaces The codec includes an Ethernet interface for IP protocol networks interfaces for transmission over leased lines and one or two ISDN interfaces are available in some versions 2 3 1 Ethernet IP interface The IP interface is a 10BaseT 100BaseT Ethernet interface allowing transmission of the audio programmes in a wide range of possible bit rates IP unicast mode The most classical transmission mode is unicast audio connection with one distant device generally bidirectional This mode can be used on all types of networks links LAN or
55. h the SCOOP 4 Details about MPEG and J52 can be found in the annexes refer to 6 1 Complements on the algorithms and protocols used It must be noted that thanks to the interoperation protocol J52 codecs when setting up a link can negotiate automatically and agree on a configuration that 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 4 MPEG coding for leased line or IP transmission J52 is only applicable to ISDN transmission and no inverse multiplexing is needed for leased line transmission neither for IP transmission because a single data stream is transmitted For these reasons only one MPEG format is defined for non ISDN transmission there is no distinction in these modes between J52 compliant or non compliant format 2 2 5 Notes about TDAC As an option the codec can also include the TDAC algorithm TDAC is for Time Domain Aliasing Cancellation this is a transform coding based on an MDCT Modified Discrete Cosine Transform
56. he are writing many public STUN servers available on the Internet here are a few examples valid at the time of Domain name Numeric address stun xten com 75 101 138 128 stun ekiga net 75 101 138 128 stun sipgate net 217 10 79 2 stun ippi com 208 73 210 27 stun sipphone com 198 65 166 165 Examples of STUN servers It is advisable to check that the server is operative list of servers can also be found on the support page of our web site http www aeta audio com 1 Although not with so called symmetric NAT routers 64 SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS Standard NAT router Situation codec A behind a NAT router with no specific programming a codec accessing Internet via a mobile network is almost always in such situation We also assume that the other codec B is accessible with a public address Once codec A is configured for using a STUN server e codec A can initiate a connection to call codec e codec B cannot call codec A Advantages Drawbacks Configuration is relatively simple B cannot call A No change is needed on the router Several codecs can be set behind the NAT router Method suitable for mobile network access NAT router with DMZ Situation codec A behind a NAT router and placed in DMZ We also assume that the other codec B is accessible with a public address Once codec
57. he profile is selected in order to delete it This deletion cannot be cancelled e Edit after browsing and selecting the profile it is possible to selectively edit its fields Press OK to select the profile then for each field make desired changes press OK until all fields have been edited The profile is then changed definitively e New creation of a new profile It is possible to enter or not a number depending on the intended use for the profile For coding the choice left is either not to include it in the profile or to use the current one Of course this means the desired coding must have been configured using the CONFIG Cod menu before creating the new profile The Profile Manager software eases the management of the profiles Running under Windows it allows more user friendly editing of the profiles on a computer The available features are the following e Offline profile editing on the computer thanks to the software e Loading the complete profile set from the computer to a Scoop4 via an IP link provided that the Scoop4 is connected to the same LAN as the computer e Reading the profile set of a Scoop4 into the computer still via IP e Backing up the profile set into a file on the computer for later use e g for copying to another codec One can e g starting with a Scoop4 with profiles created using the device menu read these profiles into Profile Manager edit them and create additional ones
58. ind a NAT router without either such change or a SIP proxy SIP server gt maximum versatility at the expense of some initial effort for installation Important note contrary to a common but wrong belief the SIP protocol always used by AAS codecs does not impose the use of a SIP server Codecs can set up point to point links using this protocol in the above described conditions When no SIP registrar is involved the identifiers are simply the IP addresses of the codecs 55 000 053 F SCOOP 4 User manual 67 v AETA AUDIO SYSTEMS 6 4 ISDN error causes The following table lists the call clearing causes The error message is typically CLEARED hh dd where hh is an hexadecimal number and dd its decimal value The message meaning is given for an ETSI ISDN Causes with values greater than 80 hex are generated internally Code Meaning 01 1 unallocated unassigned number 02 2 no route to specified transit network 03 3 no route to destination 06 6 channel unacceptable 07 8 call awarded and being delivered in an established channel 10 16 normal call clearing 11 17 user busy 12 18 no user responding 13 19 no answer from user user alerted 15 21 call rejected 16 22 number changed 1A 26 non selected user clearing 1B 27 destination out of order 28 invalid number format 1D 29 facility rejected 1E 30
59. ing suitable for a moderate transmission jitter e LOW to be preferred when the network has low QoS especially for residential ADSL lines This setting ensures a safer operation at the cost of a high latency On a LAN and or private network with a controlled quality the HIGH quality setting is recommended as it yields minimum latency On the contrary it should be avoided for a link via the Internet as it can only tolerate a low jitter One solution can be to start with a MIDDLE setting and switch to the LOW setting if too much audio disturbance is heard 4 7 5 Links with IP phones SCOOP 4 is compatible with IP phones that use the SIP protocol many on the market do The algorithm used in this case is G711 but a few IP phones can also accept G722 Note that IP phones include software SIP phones implemented on computers 4 7 6 Notes about the keypad e Use the up arrow key to switch between low case and capital letters e Once a number or SIP URI has been called it is easy to recall it without having to type it again press the green phone key then you can scroll through the history last dialled numbers using the arrows Press the phone key when the desired number is displayed This is especially useful for quickly redialling the previous number or URI 4 7 7 Multicast mode transmission On a network that can support it the multicast can optimise the resource usage when an
60. ion b blue On when unit is in standby Line 1 Green On when interface n 1 is active connected Line 2 Green On when interface n 2 is active connected Dec 1 Green On when the decoder is synchronised on line 1 Dec 2 Green On when the decoder is synchronised on line 2 INFO 1 Amber Displays the status of the received relay info n 1 INFO 2 Amber Displays the status of the received relay info n 2 Test Red On whenever a test loop is active Alarm Ext Red On in case of an external alarm Alarm Int Red Onin case of an alarm with internal cause 55 000 053 SCOOP 4 User manual 15 goef 194208 oipne JIOOUUf ueaJos 0901 oe es eoJnos Buuojuoui mm oipne pue HO UO AETA AUDIO SYSTEMS Figure 2 Front panel of SCOOP 4 55 000 053 F SCOOP 4 User manual 16 425 AETA AUDIO SYSTEMS Audio monitoring Two pairs of LED bargraphs display the level of the audio signals both on the transmission and reception directions The top bargraphs display the level of the audio channels on the transmitter encoder while the bottom bargraphs display the level of the received channels decoder side The 0 dB mark is a reference level that can be adjust
61. is RJ45 socket has standard Ethernet pinout for use of a normal straight cable to an Ethernet hub or switch The installation and operation of this function is detailed in 3 5 Initial setup of the Ethernet interface 5 1 10 Digital I O interface TBD 52 SCOOP 4 User manual 55000 053 F Chess AETA AUDIO SYSTEMS 5 1 11 Relay transmission interface AUX socket The relay transmission interface refer to 2 6 2 Relay transmission is available on the 25 pin female sub D AUX Socket It includes two isolated current loop inputs and two dry contact outputs The following table shows the pinout of the socket for this function 13 Output loop n 2 b 12 Output loop n 1 b 11 Input loop n 1 b 10 Input loop n 2 b 9 5 of internally supplied power supply s All loops are isolated and bi directional free polarity The characteristics of the input loops are Input loop control current 6 mA max 100 mA Resistance of input loop 560 Q current limiting series resistor Input loop isolation gt 1500 Vrms A 5V to 12V source may be connected directly on an input loop because the internal series resistor is dimensioned for this purpose For a higher voltage source it may be necessary to limit the input current The characteristics of the output loops are Maximum switching voltage output 350 V peak Maximum switching current output 120 mA Resis
62. kept in the unit s memory and reloaded at each start It is required to restart the unit right after the initial setting to ensure that everything is OK To check the setting you can read the IP address in the About menu TOOLS Maintenance About You can then also check that the unit is seen on the network and at the right address from a computer connected to the same network enter in the command mode or console mode depending on the OS ping ipaddr where ipaddr is the IP address of the SCOOP 4 If the response is positive then you can proceed with the rest 55 000 053 F SCOOP 4 User manual 25 v AETA AUDIO SYSTEMS 3 6 Use of the embedded html server From a computer connected to the same network open an html browser window and enter the IP address of the SCOOP 4 in the address or URL field This gives access to the html server that is embedded in the SCOOP 4 The displayed page typically looks like the following picture SCOOP 4 IP Configuration AKTA AUDIO SYSTEMS General configuration Codec mode SIP 5 Multicast send Multicast receive Language English 11 REFRESH SIP Line Registering User Display name Registrar Authentication User Authentication Password Registration Status not registered NAT Firewall traversal Outbound proxy STUN server STUN mode of v SAVE 51 REFRESH
63. lect DHCP in the menu TOOLS Maintenance Ethernet Setup The unit will then automatically find the DHCP server and automatically the parameters You can read the IP address allocated to the unit by the DHCP server in the About menu TOOLS Maintenance About Note that as an additional advantage with DHCP you do not need to change this setting later even if you move the SCOOP 4 to another network as long as it is still connected to a DHCP server 24 SCOOP 44 User manual 55000 053 F Chess AETA AUDIO SYSTEMS 3 5 2 Static IP configuration When there is no DHCP server you have to enter the settings manually using the menu TOOLS Maintenance Ethernet Setup Manual etc The IP address must be available i e not already assigned to other equipment Ask support from the network administrator s as needed The following has to be entered Parameter Notes IP address Must be unique on the network Network mask A typical value is 255 255 255 0 IP Gateway DNS Domain Name Server All addresses are in the form n p q r Examples 192 168 0 12 10 0 54 123 Note in contrast to the configuration with DHCP the static setting has to be reviewed each time you move the unit to a new physical site network as the previous IP addressing is probably not valid for the new location 3 5 3 Checking the IP configuration The above configuration is
64. lows an encoder device to transmit an audio programme to several decoders by sending a single encoded stream to a multicast group address The link is unidirectional by nature This mode can be used on a local area network and on larger private networks that can manage the multicast mode On the other hand Internet cannot support this routing mode 1 Informative value higher than the net encoded audio bit rate because of the protocol overhead 55 000 053 F SCOOP 4 User manual 7 425 AKTA AUDIO SYSTEMS In this mode SCOOP 4 uses the RTP protocol to manage the audio stream like in the unicast mode but the SIP protocol is not applicable here instead a proprietary signalling system is used As the link is unidirectional the unit has to be set either as a sender in order to encode and transmit the audio stream to the selected group address or as a receiver to receive and decode such stream coming from a sender device The audio coding algorithm can be selected with just the same capability as for the unicast mode described above Remote control via IP In addition the Ethernet interface can be used for configuring or remote controlling the unit via a TCP IP connection e embedded web server allows configuring some parameters using a web browser via port 80 default port for the HTTP protocol e port 6000 can be used for a command line control mode typically used by codec s
65. mandatory information element is missing 61 97 message type non existent or not implemented 62 98 message not compatible with call state or message type non existent or not implemented 63 99 information element non existent or not implemented 64 100 invalid information element contents 65 101 message not compatible with call state 66 102 recovery on timer expiry 6F 111 protocol error unspecified 127 interworking unspecified 91 145 no signaling data link establishment A2 162 no line activation FF 255 call clearing unspecified 55 000 053 F SCOOP 4 User manual 69 v AETA AUDIO SYSTEMS 6 5 V35 interface adaptation This annex indicates the proper connections to use when interfacing the SCOOP 4 codec to DCE equipment using a V35 interface 6 5 1 Connection table The three leftmost columns show the pin allocation on the 15 pin connector of the codec The two columns on the right indicate the pinout on a 34 pin V35 connector or a 37 pin sub D connector Consult the DCE documentation for other connector types Only the bold indicated signals need be connected leave other pins unconnected However the frame ground pin 1 may be used for connecting the shield of the connection cord 24 i Signal Pin gt Function V35 signal 34 pin 37 pin signals direction connector connector G 8 Signal ground lt Data clock lt Data clock PN lt Receiv
66. me typical solutions Most probably a network administrator should be consulted for support and for granting adequate network authorisations and or privileges The most classical issues are related to e The presence of a NAT router on the network path between the codecs e The presence of a firewall on this path It is always important to have available the information regarding the network organization and to be allowed to access the devices which need to be configured Hence we highly recommend to involve the persons empowered for such tasks 6 3 1 Links via a private network No special problem should be met within a LAN The operation is also possible with codecs from other manufacturers provided that they comply with the Tech3326 EBU recommendation also known as N ACIP recommendation However you should check for specific settings or preparation possibly needed on such devices A wide area network covers a wider geographic range and the network topology most probably includes routers on the path between the codecs to be linked However usually there is not much difference with a local area network Note using a VPN leads to just the same case the operation is identical as far as the codecs are concerned 6 3 2 Links through a public network Internet If each of the units has got a direct access to Internet with a public address we are in the same situation as the previous one functionally speaking private WAN
67. n be useful for audio monitoring For each codec that has to decode the stream the procedure is simple e Set the codec in multicast receive mode e Start the decoder as for setting up a cormal call enter the IP group address then press the 55000053 SCOOP 4 User manual 45 v AETA AUDIO SYSTEMS 4 8 Auto redial feature In LL mode the unit is always supposed to be linked and it will transmit and look for a reception signal as long as it is on In contrast the IP mode and the ISDN modes are dial up modes where a link can be set up and released at will When it is necessary to hold the link on permanently outgoing calls may be backed up by using the auto redial function When it is active the codec can redial automatically in case a connection fails The redial capability applies in three situations e If the initial call fails for any reason e g called party is busy the codec then redials and retries to establish the link e 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 e After a power failure after rebooting the codec will automatically redial and set up the link back 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
68. nds to switch the unit on When the unit is in operation press the key down for more than 3 seconds to switch it off In addition to this soft switch the unit automatically switches on when AC power is applied to its power socket LCD and basic control keypad This part is used for configuration and call set up details cane be found in chapter 4 dealing with the operating mode The 2x20 character alphanumeric display is surrounded by the following keys from left to right Key Function x e Release a link in IP or ISDN transmission mode Hang up O Start a link or accept an incoming call in IP or ISDN transmission Unhook mode Navigation keys Menu dependent keys used to scroll options and or select an option in a menu The bottom line on the LCD shows the function of each key OK key Confirm a selection or enter data Ese D key Short pressure Escape to higher menu level Long pressure Switch on or switch off the unit The blue LED besides the Esc Power key is off in operation but lights on when the unit is in standby 1 Note the standby mode can be disabled by internal configuration in such case a long pressure has no effect 14 SCOOP 4 User manual 55 000 053 F Status LED indicators The LEDs have the following meaning from left to right v AETA AUDIO SYSTEMS Marking Color Funct
69. nn 41 Loop Loop control 9 13 20 46 47 48 53 54 55 Test lOO p s 9 10 15 31 M MAG 29 9 24 25 28 30 33 34 23 24 31 50 Monitoring esee 9 10 13 14 17 MPEG 2 4 5 6 7 11 12 21 39 57 60 MPEG 2 4 7 Mult c st eR dr 2 7 28 N EE 28 43 63 64 65 M 57 Password sss 23 28 29 32 49 Port 1 65 Power supply 14 18 20 23 53 55 56 58 59 aan ertt et cer epe eoa eere ea eee 6 9 40 PEOR Ye testo ees 7 24 28 43 61 R i i ciere feret 42 44 46 Reed Solomon sss sese 5 21 60 Relay transmission 2 11 12 20 21 53 54 60 Remote control 2 8 9 13 20 24 46 52 59 ccnl ene enc ee ae 33 49 S SO interface 2 3 8 Sampling rate sees ereer 6 23 50 1 2 6 48 KTT T eire treten rto En En 32 SIP prOtOCOl ui i drei eene rtr e 6 7 8 24 44 61 27 32 iUm 32 40 43 44 46 61 SIP SGEVOE t tere eoe eae oe eee Ceo a e beta Ce Oe PETER 66 SNR Signal to Noise 57 SRI ecce tetti 2 4 5 21 Standby esscr eerren aR 14 15 30 NIE AD po EL 30 32 SA M
70. nnel This function is currently only available in leased line transmission mode This function is available as an option It enables the transmission of an auxiliary audio channel or coordination or order wire channel along with the compressed audio by reserving 8 kbit s from the transmitted bit rate This channel uses a compression algorithm of CELP HLTP type and provides a voice grade channel 300 3400 Hz pass band This function is only available when the main audio programme is encoded in G722 H242 ISDN mode MPEG excluding the proprietary ISDN mode or ADPCM With G722 or ADPCM the coordination channel cannot be used along with other auxiliary functions i e data channel or relay transmission When using MPEG coding all three auxiliary functions can be activated at the same time Note that relay transmission and the coordination channel are only compatible with AAS products as these functions are not covered by independent standards 12 SCOOP 4 User manual 55000 053 F Chess AETA AUDIO SYSTEMS 3 Operation 3 1 General principles The equipment control and supervision configuration status monitoring is possible in two ways e Local mode front panel keyboard and display status indicators e Remote control mode thanks to an asynchronous serial port or the Ethernet interface As a general rule the configuration parameters are saved in non volatile memory and restored when
71. nput is accepted on a port as an answer to a request from the local network but an external agent cannot directly initiate the transmission of a packet The terminal units on the LAN only know their private local address On the other hand agents implementing the SIP protocol have to communicate to each other the addresses and ports to be used for the media exchanges Because of the NAT routing agents do not get the real public addresses which leads to failure of the session setup attempts We are now looking at various methods used to overcome these obstacles NAT and use of the STUN server The STUN protocol is a method which is often successful in helping the agents to discover their public address e e even when they are hidden behind a NAT router Here is the operation principle STUN server 1s used which 1 accessible over the Internet The address of this server is programmed into the agent i e the audio codec in our topic The agent queries the server and discovers its public IP address and port number as seen from outside of the NAT router and LAN This addressing information is then used by the agent for negotiating and setting up a media session The STUN server address is programmable in the html page of a Scoop 4 or Scoopy Besides one can also find in the menu keypad and display on the front of the unit an activate disable on off selection available without having to clear the server address T
72. nput Source Level Meter Input Impedance 600 Ohm Max Output 0 dBu 16 dBu 22 dBu Max Input 0 dBu 16 dBu 22 dBu Synchro Genlock Sampling 32 kHz 48 kHz 96 kHz Analog AES HEADROOM 0 dB 12 dB 40 dB Notes Defines the maximum analog level reached for a maximum level decoded signal 0 dBFS Defines the analog input clipping level sending a maximum level signal to the encoder 0 aBFS Note valid for Master mode Genlock mode follows AES input Refer to Audio monitoring section for this setting 38 SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS 4 4 6 SETUP Cod sub menu SETUP Notes Cod Previous 1 Previous 2 Previous 3 Previous 4 Previous 5 G711 Not available in LL mode G722 SRT H242 only for ISDN mode H221 CELP Only for IP mode 4SB ADPCM MONO STEREO L2 J52 Only for ISDN mode CHANNEL MODE MPEG L2 with J52 L ono DUAL MONO STEREO JOINT STEREO SAMPLING RATE L 16 kHz 24 kHz 32 kHz 48 kHz BIT RATE L 564 kb s 128 kb s 192 kb s 256 kb s 384 kb s ERROR CORRECTION MODE 1 MODE 2 MODE 3 MPEG L2 same parameters as L2 J52 but max 128 kb s in ISDN mode AAC LC HE AAC HE AAC v2 OPTIONAL IP and ISDN modes CHANNEL MODE L MOoNO 1 SAMPLING RATE Lag kHz 32 kHz BIT RATE L 64 kb s 1 128 kb s TDAC OPTIONAL Important notice limit
73. odes Besides other algorithms are available that are so called proprietary because they do not comply with enforced standards e CELP running in mono at a net 24 kbit s bit rate and providing a 7 kHz bandwidth only used in IP mode 458 ADPCM running either in mono at 128 kbit s bit rate or in stereo at 256 kbit s the bandwidth with this algorithm is 15 kHz e TDAC mono running at 64 kbit s with a 15 kHz bandwidth available as an option in ISDN mode In the dual 7 kHz codec mode each codec or audio channel can be encoded using the following algorithms e 0711 which is the standard coding for voice transmission on the ISDN this algorithm is not available in LL mode e ITU T 0722 running in mono at a 64 kbit s rate The following describes some important features of the various available algorithms and protocols 2 2 1 Notes about G711 G711 is the standard coding used for voice transmission on public telephone networks This algorithm is typically used for links over IP networks with IP telephones or VoIP gateways Via ISDN G711 is used for links with telephones or hybrid devices G711 is available only for IP or ISDN transmission not over the leased line interfaces 2 2 2 Notes about G722 With G722 coding three synchronisation modes are available e Statistical recovery byte synchronisation method alias SRT e H221 synchronisation in this case 1 6 kbit s from the compressed data are used f
74. one with a loopback before coding decoding so the possible effect of compression has no influence To be detailed 5 2 3 Group delay distortion Taking the minimum group delay as reference the group delay distortion on the AD DA path is always less than 1 ms 5 2 4 Idle channel noise Background noise is measured with no audio modulation idle channel with maximum input and output level set at 16 dBu through the whole encoder decoder chain wide band coding with 48 or 32 kHz coding frequency Maximum noise level 56 dBm quasi peak detection CCIR weighting or 62 dBqOps This result in a signal to noise ratio SNR of more than 72 dB When the maximum input and output level is set at another level both the signal and noise levels are shifted but the SNR remains in the same range 5 2 5 Total distortion vs frequency and level Total distortion relative to maximum level or THD is less than 82 dB over the whole audio bandwidth 20 20 000 Hz This performance holds for audio signals from 80 dB to 1 dB relative to the maximum level 16 dBu 5 2 6 Crosstalk Crosstalk is less than 80 dB over the whole bandwidth 5 2 7 Gain and phase difference between channels The gain difference between channels is less than 0 3 dB over the whole bandwidth for any sampling frequency The phase difference between channels is less than 3 degrees over the whole bandwidth for any sampling frequency
75. onfiguration In doubt leave this number blank This is usually appropriate for public lines Sub address SA This number differentiates several terminals connected to the same ISDN bus which are allocated the same call number s Thus it can be useful in case other devices are connected with the Scoop 4 on the same line Whenever a sub address is set the unit will only accept incoming calls specifically directed to this sub address Most often the best setting is to leave this blank 4 6 2 Call an ISDN number To set the link first set if not already done the unit in ISDN mode menu SETUP Net ISDN Then select the desired encoding format SETUP Cod Y You can get a fast setting by simply selecting one of the recently used configurations displayed Then enter the ISDN number of the destination and press the green phone button If a sub address is needed after the number enter the character and the sub address 4 digits max The number then has the form nnnn ssss e g 0912345678 32 When the selected encoder needs two or more B channels the unit asks for additional numbers If the same number is suitable just press the green phone button without re entering a number An error code is displayed in case of a failure of the link establishment Refer to annex 6 4 ISDN error causes to find the corresponding meaning 55 000 053 F SCOOP 4 User manual 41 425 AKTA AUD
76. or this e H221 synchronisation and H242 protocol This is only available for the ISDN mode H221 synchronisation 15 highly recommended when possible as it features higher reliability and faster recovery time while degradation because of the bit rate used for framing is minimal H242 protocol the most flexible mode is recommended by the ITU T and is included in J52 However the mode with H221 synchronisation but without H242 protocol can be useful for compatibility with old generation codecs which did not use this protocol No specific synchronisation is needed for the IP mode 1 Not available for first generation units 4 SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS 2 2 3 Notes about MPEG coding and J52 The ITU T J52 recommendation was defined in order to allow the interoperability of multimedia terminals over the ISDN using common coding standards It includes the following features e Framing as 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 e nteroperation procedures according to ITU T H242 recommendation e In the 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 wit
77. ored number is dialled by the unit Besides configuring the equipment operating mode this module monitors its status detection of alarm conditions On detecting operation or transmission faults the equipment switches on indicators and relay contacts Two alarm classes are defined e Internal alarm corresponds to a major fault internal to the equipment e External alarm corresponds to a fault whose origin is deemed external to the equipment for example transmission fault For maintenance purposes some test loops can be activated e Audio loop uncompressed audio data are looped from the input of the encoder to the input of the output conversion functional block This loop redirects the audio input to the audio outputs e Loop 3 or Codec loop compressed audio data are looped just before the network interface e Loop 2 or Network loop this loop sends the received data back to the network for the remote codec the effect is the same as a loop 3 when the transmission works correctly e Audio feedback loop audio output to audio input this allows the codec to send back to the remote codec the signal it receives after decoding and re encoding The following drawing schematically shows the test loops Audio gt Conversion Encoding x inputs input Audio Audio Natwork Audio loop monitoring Sir wt 3 Network Audio
78. ormal LL mode 4 10 3 Receiver codec setup and operation The setup is easy on the receive side of the backup link as it is somewhat passive The backup receive mode must be activated via the menu TOOLS Miscellaneous LL Backup Backup Receive Once this is done when the codec is operating in LL mode on receiving a call from the ISDN interface or the IP interface the codec switches to the ISDN or IP mode answers the call and the connection is established with the remote codec Later when the temporary connection is released by the calling party the receiver codec automatically switches back to LL mode and normal operation is resumed Reminder in LL mode the codec accepts no incoming call from its IP ISDN interfaces unless the backup receive mode is active Conversely once this is done the codec accepts incoming calls regardless of the network interface IP or ISDN Thanks to the automatic coding algorithm detection 5AS in ISDN mode or SIP SDP in IP mode the coding setup is not critical on this receiver side However for increased safety in ISDN mode one may prefer to force the configuration by de activating the 5AS 4 10 4 Notes regarding the automatic switchover Note that when switching from LL to ISDN or IP mode a separate set of parameters is recalled As a consequence the coding configuration can be made if desired totally different in the back up ISDN or IP mode Of cou
79. period that the unit will wait before redialling after a failed trial and it is also possible to program the maximum number of times the codec will redial before giving up The activation of this function and the configuration of its parameters can be found in the Auto Redial sub menu TOOLS Misc Auto Redial menu In dual codec mode the function can be activated separately for each codec 4 9 Loop control In normal operation for IP or ISDN mode outgoing calls are sent or released using the menus and or the remote control interface When the loop control function 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 last number or SIP URI in the IP mode previously dialled by the unit When the loop is de activated the codec releases the line and stays idle as long as the loop is not active except if receiving an incoming call Y In normal operation it is nevertheless possible to release a running connection by briefly activating pulse the control loop 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 describ
80. powered from a 12V DC source non isolated The unit includes protection against overcurrent resettable fuse the DC input and overvoltage The DC source voltage must be in the 10V 15V range The maximum consumption is 1 A for a 12V DC source 5 5 Dimensions and weight The unit is 19 inches frame of 1U height 44 mm or 1 75 and 252 mm depth 12 5 Its weight is about 3 2 kg 58 SCOOP 4 User manual 55 000 053 F Chess AETA AUDIO SYSTEMS 5 6 Environmental characteristics The equipment operates over a 0 C to 45 C ambient temperature range 32 F to 113 F and 5 to 90 humidity ratio range The SCOOP 4 complies with CE directives regarding safety and EMC e Safety compliance with EN60950 e EMI radiated emissions complying with EN55103 1 e Susceptibility compliance with EN55103 2 5 7 Versions Options The various versions available for the SCOOP 4 are the following e SCOOP 4 DUO LL IP with Ethernet IP and leased line interfaces e SCOOP 4 TRIO LL IP ISDN 2B with Ethernet IP leased line interfaces and one ISDN interface e SCOOP 4 TRIO LL IP ISDN 4B with Ethernet IP leased line interfaces and two ISDN interfaces Besides certain functions are available as options e MPEG AAC LC audio coding e MPEG HE AAC and HE AAC v2 audio coding e Audio coordination channel e algorithm for ISDN mode e 12V DC power instead of AC mains 5 8 Accessories and relat
81. puts and outputs Audio coordination channel Control and supervision Keyboard and LCD display on front panel 99 programmable set up dial memories Remote control serial port Ethernet remote control interface Embedded html server Isolated control and status loops Table 1 Main features of the SCOOP 4 2 SCOOP 4 User manual 55 000 053 F v AETA AUDIO SYSTEMS 2 Functions The following synoptic diagram shows the basic functions of the equipment Audio Conversion inputs Monitoring Supervision Network Audio _ Conversion Decoding outputs Control interface Figure 1 Functional diagram of equipment The audio signals to be transmitted are converted when needed to digital format then the encoding function reduces the bit rate using a selectable algorithm the resulting bit flow is sent to one of the available transmission interfaces permanent link data interfaces X21 X24 V35 ISDN interfaces SO or UO or an Ethernet interface The transmission interface functional block also extracts compressed data coming from the network and sends them to a decoding block that reproduces uncompressed audio data Last the audio signals are output to both digital and analogue outputs 2 1 Conversion of audio signals The analogue inputs and outputs are balanced and the input and output gains are adjustable The sampling frequen
82. ration parameters 22 SCOOP 44 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS 3 4 Installation and set up 3 4 1 Mounting and connections Natural convection cools the equipment Avoid obstructing the openings on the flanges To operate the codec the minimum necessary connections to set up are see details in the rear panel description e Power supply e Audio inputs and outputs XLR sockets e Network interface depending on the networks used Ethernet interface ISDN lines and or X24 V11 V35 interface s Whenever needed the ALARM X24 V11 socket must be connected to an external supervision system alarm relay contacts The pin out of the connectors is indicated in chapter 5 1 Characteristics of interfaces 3 4 2 Initial set up Before the first link the equipment must be configured according to the desired operation mode audio input output format coding type and parameters etc and the local conditions network interface parameters For using the keyboard a password may have to be entered After factory setting or after total configuration erasure the password is blank no password needed Afterwards a password can be programmed by the user if one is needed For more details about the codec configuration see chapter 3 3 Equipment configuration parameters p 21 and chapter 4 Detailed operating mode The setup of the Ethernet interface is described in 3 5 Initial setup of the
83. rse 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 48 SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS 4 11 Erasing and resetting the configuration In some cases like e g if the password is forgotten it may be necessary to restart from the factory default setting To erase the entire configuration and load the factory default settings you should normally go to the General Reset sub menu TOOLS Misc General Reset Incase the keyboard is locked and you have lost the password hold the hang up key pressed for 10 seconds this forces the system directly to the General reset sub menu You can then confirm that you really want to erase all the settings including the password The factory default password is blank 4 12 Backing up and recalling the configuration It is possible to backup all the settings of the unit in a file complete snapshot and conversely restore complete setup from a file previously backed up in this way Such transfers are done using the embedded html server refer above to 3 6 6 for the operation 55 000 053 F SCOOP 4 User manual 49 v 5 Technical characteristics
84. s in the normal mode If loop control is not activated it is always possible to use the loop to release a running connection a pulse on the loop will release the line Besides whatever the connection mode normal or loop control a dry loop is closed when a connection is active The loop control interfaces are described in 3 2 2 and 5 1 13 The SCOOP 4 can be remote controlled by third party codec management software and systems Please consult us for more information on the available offer in this field 55 000 053 F SCOOP 4 User manual 13 v AETA AUDIO SYSTEMS 3 2 Physical description of the equipment The SCOOP 4 codec is housed in a 19 inches chassis of 1U height 44 mm or 1 75 It includes a universal mains power supply or optionally it can be powered from a 12V DC source 3 2 1 Front panel the elements needed for local control are located on the front panel see picture on page 16 below This panel can be roughly divided in three areas On the left hand side one can find an LCD and the basic navigation and dialling keys The central area of the panel includes several status LEDs and a keypad for the entry of dialling numbers and or text data The right hand side groups audio monitoring elements The Esc key is also used to power the unit on and off When the unit is in standby the blue LED besides the Esc key is on hold the key depressed for at least 3 seco
85. s to know its SIP address which can be like studiol2cod Gradiomcr com indeed very similar to an e mail address To call the unit the reporter has to select the preferred audio coding mode on the Scoopy e g mono G722 then call the remote unit simply using this SIP address SIP URD What happens then on the network the Scoopy sends the request INVITE in SIP protocol to a proxy server often the same device is also the registrar To make things simple this proxy then relays and routes the request O to its destination Resolving the SIP URI to a physical network and address uses mechanisms similar to those used for resolving URLs Several proxys may be involved in cascade to finally reach the desired destination but this does not have to be known or dealt with by the end devices The following is like the initiation of a phone call the IP codec rings if it accepts the call this is notified to the Scoopy At this stage the proxy s provide the Scoopy and the IP codec with all the address data they need for the link then the actual audio streams can be exchanged between both units As a very important feature the end devices now can exchange data directly the proxys do not have to be on the path they are only involved in the setting and later the ending of the session The codecs will automatically exchange their coding capabilities and agree on a coding mode with no further user intervention Alternatively the
86. set value for a given parameter 55 000 053 F SCOOP 4 User manual 33 v AETA AUDIO SYSTEMS 4 4 1 TOOLS About and TOOLS Maintenance sub menus TOOLS Maintenance Alarm 1 Alarm n About iP ADDRESS Ethernet Setup User Access Password Notes displays IP address VERSION displays version info EIM displays version info SOFTWARE NS displays software serial number SIP REGISTRAR REGISTRAR STATUS displays SIP registrar s address if any displays status OK or NOK DHCP Manual LL Address Mask Gateway DNS switch Full lt gt Reduced mode Confirm blank after factory reset Enter new password Confirm password No test loop Audio loop Loop3 codec Loop2 Network Audio Feedback 34 SCOOP 4 User manual 55 000 053 F TOOLS ANS AETA AUDIO SYSTEMS 4 4 2 TOOLS Misc sub menu Miscellaneous General Reset LEAR ALL SETTINGS Yes No Antenna Control Off Aux Functions DATA CHANNEL Ex On RELAYS COORD CHANNEL Off On LCD Backlight Off On LED Brightness Low Medium 1 High Language ee ENGLISH FRENCH Auto Redial 20 Infinite Time before dial 30 Loop Control Off On Backup 5A System Off On LL Backup Backup Call IP ISDN Backup Receive Off Notes only proposed in the specific Inmarsat BGAN version availability depends on the current n
87. sion between two compatible units e Use of a SIP proxy server for the call setup The coding algorithm can be selected depending on the desired quality and audio bandwidth The algorithms currently available are listed in 2 3 1 Ethernet IP interface If you wish to register the codec on a SIP proxy server you should configure in the device the data for the SIP account on this server This can be done using the embedded html server refer for that to 3 6 1 below For setting into operation first connect the Ethernet interface to the network using CATS wiring e Connection to 10BaseT or 100BaseT interfaces both suitable as SCOOP 4 automatically switches to the right 10 Mbit s or 100 Mbit s mode e Straightforward patch cables should be used for a connection to hub or a switch Conversely a crossed cable might be needed for special configurations e g a test connection to a PC As a very first step the Ethernet interface must be assigned an IP address and related parameters This phase is very simple when a DHCP server is available in the network The menu to use is reached by TOOLS Maintenance Ethernet Setup When Ethernet IP is the current interface for audio transmission an alternate path in the menu is SETUP Net Param Network Setup 3 5 1 DHCP server available This is the simplest case because the server will allocate a suitable IP address and give the unit the right settings Se
88. ssification of alarm conditions Excluding the case when an internal failure disables the management micro controller messages are displayed to indicate the anomaly or the fault can be searched using the menu 1 Minor alarms are readable on the display but do not trigger alarms contacts and LEDs 2 Fault of the network clock source currently used for synchronisation X21 X24 main port or secondary port 30 SCOOP 4 User manual 55 000 053 F 425 AETA AUDIO SYSTEMS The test loops accessible from the TESTS menu can help improve the analysis of a problem e In order to check if the audio part functions correctly use the Audio loop and check if the audio is OK at the output 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 e Loop 2 sends back to the remote codec the compressed data received from the network see the description of test loops in 2 4 Supervision and control interface page 9 This way it is possible to test the integrity of the transmitted data and or check that the remote codec works properly The decoder out to encoder in loop Audio feedback loop can be used for overall functional check and also for aligning the overall chain In leased line mode a clock fault is one typical cause of an external alarm This can be due to
89. t loop 1 triggers an ISDN or IP call on the codec codec 1 only if the unit is configured as a double ISDN 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 ISDN 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 or IP connection is running or while codec 1 is linked if the unit is configured as a double ISDN codec e Output loop 2 is closed while an ISDN connection is running on codec 2 if the unit is configured as a double ISDN codec The following table shows the wiring of the socket for this function Lm Fedm 17 Input loop n 2 a 18 Input loop n 1 a 19 Output loop n 2 a 20 Output loop n 1 21 of power supply loops are isolated and bi directional free polarity The characteristics of the input loops are Input loop control current 6 mA max 100 mA Resistance of input loop 560 current limiting series resistor Input loop isolation gt 1500 5 to 12V source may be connected directly on an input loop because the internal series resistor is dimensioned for this purpose For a higher voltage source it may be necessary to limit the input current 55 000 053 F SCOOP 4 User manual 55 v AETA AUDIO SYSTEMS The characteristics of the outpu
90. t loops are Maximum switching voltage output 350 V peak Maximum switching current output 120 mA Resistance of output loop 350 Output loop isolation gt 1500 Vrms The 5V power supply is available from the unit to power low consumption device maximum 300 mA current consumption or e g to power the input loops or LED indicators connected to the output loops 5 1 14 Connector for DC input option The 12V DC version of the product includes in place of the AC power socket a 4 pin male XLR socket for the connection of an external DC source The ground is connected on pin 1 and the 12V source must be supplied on pin 4 56 SCOOP 4 User manual 55 000 053 F Chess AETA AUDIO SYSTEMS 5 2 Audio performance The audio performance in this part applies to the system without coding decoding and excluding the coordination channel The additional effect of the audio encoding and decoding on audio performance depends on the coding algorithm used and its parameters Except when differently stated the following measurements are done at a 6 dBm input level and on the AD DA path with maximum input and output level set at 16 dBu 5 2 1 Transmission gain The drift in time of the gain from the input to the output of the codec is less than 0 3 dB 5 2 2 Amplitude frequency response All measurements are done with a 6 dBm input signal and a reference frequency of 1020 Hz The measurements are d
91. t value is 6000 e Audio port this is the UDP port multicast used for the audio stream itself If this field is left blank its default value is 6001 e TTL Time To Live leave the default value 128 unless there is a specific reason to change it 28 SCOOP 4 User manual 55 000 053 F Chess AETA AUDIO SYSTEMS 3 6 3 System section The system information includes information about the embedded software versions the Ethernet MAC address unique and fixed for a given unit and the current IP address Be careful with the security password This optional feature is left blank in the initial factory setting It is highly recommended to set a password non trivial of course whenever the unit is installed in a non protected environment i e when non authorised persons can access the html page 3 6 4 Maintenance section e Firmware update this section allows uploading updates for the embedded software Detailed instructions are provided with the update files e The REBOOT button immediately restarts the unit 3 6 5 Event logging section Access is given in this section to a log recorded in the codec internal memory card The events are stored in text mode unformatted ASCII and the html page directly shows the last 50 events under the Log headline It is also possible to get the complete history e Either by opening the full log in a separate tab or window thanks to th
92. tance of output loop 350 Output loop isolation gt 1500 Vrms The 5V power supply is available from the unit to power a low consumption device maximum 300 mA current consumption or e g to power the input loops or LED indicators connected to the output loops 55 000 053 F SCOOP 4 User manual 53 425 AKTA AUDIO SYSTEMS 5 1 12 Coordination channel interface AUX socket In addition to the loop control and relay transmission interfaces the optional coordination channel input and output are available on the 25 pin female sub D connector AUX Socket on the rear panel with pinout as indicated hereunder The input and output are balanced floating signals transformer isolated Maximum level 9 dBm Impedance 600 Q Nominal bandwidth 300 3400 Hz Coordination channel output Coordination channel output 4 Frame ground Coordination channel input Coordination channel input Frame ground 54 SCOOP 4 User manual 55000 053 F 425 AKTA AUDIO SYSTEMS 5 1 13 Loop control interface AUX socket 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 The input loops have an effect only if the loop control function is enabled see 4 9 Loop control The output loops are always operative e Activating the inpu
93. the transmitted or received signals 55 000 053 F SCOOP 4 User manual 17 v AETA AUDIO SYSTEMS 3 2 2 Rear panel connections are done on the rear panel of the codec The characteristics of the interfaces and layout of the sockets are detailed in chapter 5 1 Characteristics of interfaces The following elements are available on the rear panel refer to following Figure 3 Rear panel Mains power socket This is an IEC type power socket The 12V DC version of the product includes in place of this AC power socket a 4 pin male XLR socket for an external DC source Refer to details in 5 1 14 Connector for DC input option Audio inputs outputs e Analog inputs outputs at the input plug the audio cables into the female XLR sockets At the output plug the audio cables into the male XLR sockets In mono mode only channel is used e Digital inputs outputs a digital input mono or stereo in AES EBU format or SPDIF can be connected on the female XLR socket and a digital output in AES EBU format is available on a male XLR socket e It is possible to select which input analog inputs or digital input is fed to the encoder for transmission On the receiving side the decoded signals are output both on the analog and digital outputs X24 V11 V35 interfaces labelled X24 V11 V35 and ALARM X24 V11 These sockets are used for the connection to data transmission equipment in the
94. um output current 120 mA Maximum output voltage 350 V peak Resistance of output loop 350 Isolation gt 1500 Vrms The codec does not transmit a C signal The codec can also be connected to V35 interfaces a specific adaptation cable is needed in such case The connection is described in Annex 6 5 V35 interface adaptation 55 000 053 F SCOOP 44 User manual 51 v AETA AUDIO SYSTEMS 5 1 7 Remote control interface This interface uses a 9 pin female Sub D connector on the rear panel This is a V2A RS 232 type interface with only Tx and Rx signals no flow control The following table indicates its pinout DCE type pinout m Rad SOS ST ITT 99 7 or Naememi The interface is configured as follows 4800 bauds 8 bits no parity one stop bit 5 1 8 Data interface data This V24 interface uses a 9 pin female Sub D connector on the rear panel Like for the remote control interface only Tx and Rx are used there is no flow control and the pinout is of DCE type EN s I Gom harem TT The data interface is configured as follows 8 bits no parity one stop bit It is possible see menu TOOLS Misc Aux Functions DATA CHANNEL to activate the interface and to configure its baud rate 300 to 9600 bauds However the maximum allowed baud rate depends on the audio coding used see 2 6 1 Data channel 5 1 9 Ethernet interface Th
95. upervision software 2 3 2 Leased line interfaces For transmission over leased lines the codec includes two X24 V11 ports which can run at 64 kbit s 128 kbit s 192 kbit s 256 kbit s and 384 kbit s bit rates With most coding modes only one X24 V11 port is used In the 2 64 dual mono G722 mode the two ports provide two independent interfaces the equipment is similar to two mono codecs When transmitting in the leased line mode the codec synchronises onto the network clock provided by the X24 V11 interface In the specific 2 64 mode where the two ports are used the codec initially synchronises on port 1 but it changes the synchronisation port in case of a fault If no valid clock is available on the X24 V 11 interfaces the system folds back to an internal clock 2 3 3 ISDN Interface On the ISDN side the codec includes one or two BRI interfaces SO or UO depending on equipment version allowing transmission over one to four 64 kbit s B channels Thus the total available bit rate ranges from 64 to 128 kbit s The codec synchronises itself onto the ISDN network clock when a link is active 2 3 4 Use of a backup connection to secure a permanent link When a fixed link LL is used it is possible to use another network access IP or ISDN in order to set a temporary backup link in case the nominal LL link fails The unit will then switch to a backup mode ISDN or IP depending on the selected backup arrangement
96. v AETA AUDIO SYSTEMS SCOOP 4 Stereo audio codec for real time audio transmission User manual AETA AUDIO SYSTEMS 18 22 avenue Edouard Herriot Kepler 4 92350 Le Plessis Robinson FRANCE T l 33 1 41 36 12 00 Fax 33 1 41 36 12 69 http www aeta audio com 55 000 053 F SCOOP 4 User manual Specifications subject to change All rights reserved by AAS February 2010 55 000 053 f scoop4 en docx 425 AUDIO SYSTEMS Table of contents EC lc M 1 PEE alvi m M M 3 2 1 Conversion of audio signals ierit eere iens aeo et tea en o aepo exu 3 2 2 Encoding and decoding end eerte petet stereo t pne ee 4 2 3 Transmission interfaces E 7 2 4 Supervision and control ettet nete nente 9 2 5 Audio monitoring onte rere reete e t e aee e I ATH Ra eee e iis 10 2 6 Auxiliary TUDCCORS 11 3 Operation me 13 3 1 General erri RU ei eae 13 3 2 Physical description of the eene eterne nennen nennen 14 3 3 Equipment configuration parameters eese eee 21 3 4 Installation and Set up nee bet oN nae inne ls 23 3 5 Initial setup of the Ethernet interface
97. y and reminder of essential rules 425 AETA AUDIO SYSTEMS The table below sums up the situations where a link can be set up not using a SIP proxy server and reminds the needed specific settings Codec A Possible Codec B Notes access calls access 1 gt lt 2 Private WAN Private WAN lt 3 Internet direct Internet direct lt 4 gt Internet direct STUN needed for A NAT DMZ E Internet direct STUN needed for A 6 port gt Internet direct STUN needed for A forwarding e UDP ports 5004 5005 5060 7 NAT gt DMZ STUN needed for A and 8 DMZ gt DMZ STUN needed for and B lt 9 gt NAT DMZ STUN needed for A and B forwarding UDP pors 5004 5005 5060 10 gt forwarding STUN needed for A and B 11 DMZ forwarding STUN needed for and B lt 12 port gt forwarding STUN needed and B forwarding UDP pors 5004 5005 5060 Y Basic rule Codec behind router gt use STUN server This allows the codec to set up outgoing calls This is not sufficient to be accessible to connection requests from the outside Y Mobile network access without SIP server or VPN gt use a STUN server NAT DMZ or NAT forwarding gt incoming calls are possible Incoming calls are not possible beh
98. y return path encoded in G722 while the send path is encoded with higher quality but a higher delay 2 2 7 5A System Setting an ISDN connection is often difficult at least because of the numerous coding parameters to be set Moreover with most proprietary algorithms it is mandatory for the two devices to have exactly the same settings otherwise the connection will fail and sometimes it is not easy to find out the reason 5A stands for Aeta Audio Advanced Automatic Adjustment This system makes it easier to set an ISDN connection because the codec on receiving a call automatically adjusts itself following the calling party algorithm and parameters When the 5A System is enabled on the unit and a call is received the unit first detects the coding algorithm used by the calling codec and also senses its parameters audio mode mono stereo sampling rate bit rate inverse multiplexing protocol etc Then the unit can decode the compressed audio from the remote unit In addition the unit will use these same settings for encoding and sending audio to the remote unit so that the remote unit can also decode the outgoing audio programme The whole process just takes a few seconds Of course all compatible coding configurations can be detected automatically by the 5A System Note that the 5A system is only active for ISDN connections 2 2 8 SIP protocol and SDP The SIP protocol is a signalling protocol used for IP connections whic

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