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AVT MAGIC ISDN Hardware Description

Audio transmission system
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MAGIC ISDN
Audio Transmission System
Hardware Description

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Summary of Contents for AVT MAGIC ISDN

  • Page 1 MAGIC ISDN Audio Transmission System Hardware Description...
  • Page 3 M A G I C I S D N A U D I O T R A N S M I S S I O N S Y S T E M A S P E R I S O / M P E G S T A N D A R D L A Y E R I I / I I I A N D I T U - R E C O M M E N D A T I O N S G .
  • Page 5 Acknowledgements AVT Audio Video Technologies GmbH LabWindows is a registered trademark of National Instruments Rathsbergstrasse 17 D-90411 Nuernberg Telefon (09 11) 5 271-0 Telefax (09 11) 5271-100 Internet: www.avt-nbg.de Email: info@avt-nbg.de Printed in Germany, April 1997 © AVT Audio Video Technologies All rights reserved.

  • Page 7: Table Of Contents

    PUTTING THE MAGIC SYSTEM INTO OPERATION Construction of the MAGIC Audio Codec Selection of the network interface Connection to the data network Applications with MAGIC ISDN and MAGIC Systems 3.4.1 Generel Transmisssion applications in different qualities 3.4.2 Transmission via an X.21 channel at up to 1920-kbit/s 3.4.3...
  • Page 8 C O N T E N T Switching on the system OPERATION WITH THE OPERATOR PANEL Menu tree The main menu Submenus Entering the commands Programming example: Storing calling numbers Programming example: setting the RS232C for control via a PC ANNEX 1 TECHNICAL DATA A1.1...
  • Page 9 C O N T E N T ANNEX 4 LIST OF THE ALARMS...
  • Page 10 C O N T E N T...

  • Page 11: Quick Introduction

    Q U I C K I N T R O D U C T I O N Q U I C K I N T R O D U C T I O N This chapter contains the most important steps required for the transmission of an analogue stereo signal via ISDN.

  • Page 12: Transmission Of A Stereo Signal Via 2 Isdn B Channels (Pc Control)

    Mains cable: Use the mains cable provided. PC connection: Connect a free interface of the PC with the socket on the MAGIC system labelled RS232 C. Connect the MAGIC ISDN to the S socket(s). Connect the audio signal source (transmit sound) to the sockets #1 (left) and #3 (right) of slot 2.

  • Page 13: Putting Into Operation

    Q U I C K I N T R O D U C T I O N 1.1.2 Putting into operation Switch on the MAGIC system (mains switch at front) Switch on the PC. Install the PC operating software (remember to make a backup copy!): –...

  • Page 14: General Advice On Dialing Using The Pc Software

    Q U I C K I N T R O D U C T I O N Check the connection: The MAIN panel appears on the screen. The status of the interfaces and the dialled number is displayed here (CON- NECT = connection made) and the number dialled.

  • Page 15: Transmission Of A Stereo Signal Via Two Isdn B Channels

    ISDN 1.2.1 Connection of the components Mains cable: Use the mains cable provided. Connect the MAGIC ISDN to the S socket(s). Connect the audio signal source (transmit sound) to the sockets #1 (left) and #3 (right) of slot 2. Connect the audio signal sink (receive sound) to the sockets #2 (left) and #4 (right) of slot 2.

  • Page 16: Setting Up A Connection Using A Stored Calling Number

    Q U I C K I N T R O D U C T I O N 1.2.3 Setting up a connection using a stored calling number Keys Display Remarks Main menu Starting point. If another menu is displayed, press the Escape key to call up the main *CALL RD DIS CFG SYS MEM menu.
  • Page 17 Q U I C K I N T R O D U C T I O N Keys Display Remarks Saving With the “right” and “left” cursor keys, select NRS MODE *SAVE ERASE the SAVE menu. Save call-by-name data? Select the SAVE submenu with the Enter key. Enter the name associated with the calling Enter call name: number.

  • Page 18: Setting Up A Manually Dialled Call

    PC software. All calling numbers can be entered by the PC software and transferred afterwards to the MAGIC ISDN System. 1 This can also be done REMOTELY by our Service, in case PC Software is not to hand.
  • Page 19 If connections are always made to Audio Codecs from different manu- facturers, a configuration can be stored against each calling number. Up to 10 configurations can be stored in the MAGIC ISDN Codec and linked to calling numbers. First of all, the requirements (e.g. for MUSIC- TAXI or CDQ1000) for the far end should be stored.

  • Page 20: Factory Settings

    Q U I C K I N T R O D U C T I O N Factory settings 1.3.1 Interface Unit factory settings Line interface: ISDN Clock source: External Bit Inversion: Switched off Call answering: Switched on Inband signalling mode: J.52 (bidir.) Data rate: 2∗64 kbit/s...

  • Page 21: System Description

    REMARK In order to be able to make full use of the functions of the MAGIC audio system, we recommend that you read chapters 2 and 3 first. FIGURE 2.1 MAGIC ISDN UNIT PA G E 2 1...

  • Page 22: System Concept

    MAGIC ISDN system over an extension bus. More comprehensive information on the MAGIC EXTENSION system is con- tained in the MAGIC BASIC System Hardware Description. The special fea- tures of the MAGIC ISDN Audio Codec are as follows. Construction of MAGIC ISDN Audio Codec /#)+% +5&0 unit consists of a two-part housing, a back-plane, the power supply, the front keypad with two-line display and the front panel.

  • Page 23: Additional Options For Transmission At Higher Data Rates

    Power supply Slot 3 Slot 2 Slot 1 The following table shows the different equipping variants of the system. It should be noted that a MAGIC ISDN unit must always be equipped with an Interface Unit. Slot Equipping variations Order Number...

  • Page 24: Interface Unit

    S Y S T E M D E S C R I P T I O N mission of one audio signal. These include the assignment of the individual encoded audio signals within the transmission data stream. The extension possibilities are not available for dialled connections in the ISDN. For more comprehensive advice on the connection of MAGIC Extension units please refer to the MAGIC BASIC Hardware Description.
  • Page 25 – 1 × X.21, n × 64-kbit/s to 1920-kbit/s – 3 × So (ISDN) Data interfaces The MAGIC ISDN Audio codec has two different data interfaces available for the transmission of additional data. All interfaces are implemented as DCEs. – HSD for High Speed Data, 64 kBit/s –...
  • Page 26 S Y S T E M D E S C R I P T I O N FIGURE 2.6 BLOCK DIAGRAM OF THE INTERFACE UNIT RS232C RS485 Operator DSP-Bus Keyboard J.52-DSP Digital IO Display 3 x So Line 1 x X.21 Programm.

  • Page 27: The 'Layer Ii/Iii Audio Codec

    S Y S T E M D E S C R I P T I O N The ‘Layer II/III Audio Codec ’ The Audio Codec plug-in unit enables the transmission of audio signals at low bit rates, as is required for ISDN, for example. A reduction by a factor of 11 for Layer III and by a factor of 6 for Layer II is achieved without any loss in quality.

  • Page 28: The 'Layer Ii/Iii Audio Decoder

    S Y S T E M D E S C R I P T I O N The ‘Layer II/III Audio Decoder’ For the Decoder, it is similarly valid as shown in SECTION 2.5, except for the restriction that the Audio signal can only be decoded. FIGURE 2.8 shows the block diagram of the Decoder.

  • Page 29: The ' Audio Layer Ii/Iii Analog I' Board

    S Y S T E M D E S C R I P T I O N The ‘ Audio Layer II/III Analog I’ Board This Analogue board provides the user with earth-free and symmetrical in- puts/outputs for the Audio signals. Additional possibilities are setting levels, selecting impedance, multiplexing various Audio signals and level monitoring.

  • Page 30: Example Of A Magic System Connection

    D E S C R I P T I O N Example of a MAGIC system connection The connection of the MAGIC ISDN station shown here is an example. Not all the units shown are always connected. Nevertheless, the varied possibilities of which MAGIC ISDN is simultaneously capable of are illustrated.

  • Page 31: Putting The Magic System Into Operation

    P U T T I N G T H E M A G I C S Y S T E M I N T O O P E R A T I O N This chapter describes how a MAGIC ISDN unit is put into operation. The fol- lowing plug-in unit equipping is used as an example: –...

  • Page 32: Selection Of The Network Interface

    Selection of the network interface The MAGIC ISDN Audio Codec offers the operator two types of network inter- face. However, only one interface type can be active at a given time. The net- work interface should be selected to meet the particular requirements.

  • Page 33: Applications With Magic Isdn And Magic Systems

    MAGIC ISDN System MAGIC COMPACT 7-kHz The MAGIC ISDN system is fully compatible with the AVT 15-kHz ISDN Tele- phone. The system automatically detects which encoding should be selected. If you use the optionally available telephone handset and connect the handset to the handset socket (any other handset can also be connected), you can have a normal telephone conversation with the MAGIC ISDN.

  • Page 34: Transmission Via An X.21 Channel At Up To 1920-Kbit/S

    In this operating mode, up to 10 Audio Codecs can be connected to the exten- sion bus of the MAGIC system. The transmission is, for example, via a satellite channel at a data rate of 1920-kbit/s. The source is a MAGIC ISDN system with additional extension units.

  • Page 35: Transmission Of An Audio Signal With The Signalling Switched Off

    Right Out Dig In Dig Out Aux In Aux Out Dig In Dig Out Slot 2 Slot 3 TTL User I/O MAGIC ISDN Handset Clock Out RS232C RS485 RS232-Aux Slot 2 Slot 3 Additional Data ISDN 1 ISDN 2 ISDN 3 Line X.21...

  • Page 36: Audio Transmission Via Isdn

    In this application, the uni-directional transmission of a high-quality audio si- gnal via an ISDN connection (128 kbit/s) is shown. To set up a bi-directional Audio connection, the MAGIC ISDN System (or e.g. a MusicTaxi) equipment must have the same settings at both ends of the transmission path. MAGIC systems in ISDN operation can be used to transmit Audio data at up to 384- kbit/s.

  • Page 37: Connection To The Mains Voltage

    Connection to the mains voltage The MAGIC system can be operated with an AC voltage (mains) between 90 and 253 V without the need for switching. The mains frequency can vary bet- ween 45 Hz and 65 Hz. The power consumption is a maximum of approx. 70 W.

  • Page 38: Setting The Centre-Tap Earth For The Analogue Audio Inputs

    Setting the centre-tap earth for the analogue audio inputs The plug-in unit Audio Codec Layer II/III analogue I has four jumpers with which the centre-tap earth can be set for each channel. FIGURE 3.6 shows the position of the jumpers. In the factory setting, centre-tap earthing is not sel- ected.

  • Page 39: Operation With The Operator Panel

    O P E R A T I O N W I T H T H E O P E R A T O R P A N E L O P E R A T I O N W I T H T H E O P E R A T O R P A N E L The menus that can be called up from the operator (front) panel are described in the following sections.

  • Page 40: Menu Tree

    O P E R A T I O N W I T H T H E O P E R A T O R P A N E L Menu tree The different menus displayed in the MAGIC operator panel are organised in a tree structure.

  • Page 41: The Main Menu

    O P E R A T I O N W I T H T H E O P E R A T O R P A N E L The main menu The main menu consists of five menu items that are explained in the following. CALL: From this menu item: –...

  • Page 42: Submenus

    O P E R A T I O N W I T H T H E O P E R A T O R P A N E L Submenus Some specific submenu functions are described in more detail here. In gene- ral, the description of the PC user interface commands (see Software Descrip- tion) can be used, since the designations are almost identical in most cases.

  • Page 43: Entering The Commands

    O P E R A T I O N W I T H T H E O P E R A T O R P A N E L Entering the commands To set a function, search for the corresponding menu in the menu tree (dis- played diagrammatically from page 4-47 to page 4.51) and call up the function using the cursor keys provided on the keypad.
  • Page 44 O P E R A T I O N W I T H T H E O P E R A T O R P A N E L Keys Display Remarks Enter the calling number (without country code and local area code) and confirm with Enter.

  • Page 45: Programming Example: Setting The Rs232C For Control Via A Pc

    O P E R A T I O N W I T H T H E O P E R A T O R P A N E L Programming example: setting the RS232C for control via a PC Display Remarks Main menu This is the starting point of the menu tree.
  • Page 46 O P E R A T I O N W I T H T H E O P E R A T O R P A N E L Display Remarks Setting the Mode (string / packet) With the „right“ / „left“ cursor keys, select *MODE RATE BITS PARITY the MODE menu.
  • Page 47 O P E R A T I O N W I T H T H E O P E R A T O R P A N E L Display Remarks Setting the parity (RS232C only) With the „right“ / „left“ cursor keys, select MODE RATE BITS *PARITY the PARITY menu.
  • Page 48 O P E R A T I O N W I T H T H E O P E R A T O R P A N E L PA G E 4 8...

  • Page 49: Annex 1 Technical Data

    T E C H N I C A L D A T A ANNEX 1 T E C H N I C A L D A T A A1.1 Interface Unit with variable network access Signaling /Synchronisation ITU-T Recommendations J.52 (H.221/H.242) ITU-T Recommendation H.331 for unidirectional links MusicTAXI mode (DIALOG4, 2-B channels) CCS Mode ISO/MPEG Layer 2 (2-B-channels)

  • Page 50: Audio Codec Layer Ii / Iii

    T E C H N I C A L D A T A Operator interfaces Operator interface RS 232 C TTLI/O interface, programmable by operator, control current max. 5 mA per channel Bus system Internal bus No. of channels Variable, dependent on configuration and equipping, e.g. max.

  • Page 51: A1.3 Analogue Unit For Audio Codec Layer Ii

    T E C H N I C A L D A T A A1.3 Analogue Unit for Audio Codec Layer II / III Inputs Symmetrical, floating audio interface (XLR), centre-tap earthing selectable, Input impedance can be switched to 600 Ω or 15kΩ Nominal level –6 dBu to +12 dBu, (settable)

  • Page 52: A1.4 Power Supply

    T E C H N I C A L D A T A ± 0.2 dB over the entire frequency range Level deviation Bus system Internal bus A1.4 Power supply AC supply voltage 90 V to 253 V Frequency 50 / 60 Hz Power consumption Dependent on configuration, typically approx.

  • Page 53: A1.8 Ordering Information

    Interface unit 229671 Analogue unit (1 × stereo) 322930 Analogue unit (2 × stereo) 325208 MAGIC Basic Housing 323761 MAGIC ISDN Housing with front panel and display 337985 Power supply 321175 DCUKE MAGIC unit front panel (with display) 326603 GZVGPUKQP...
  • Page 54 T E C H N I C A L D A T A PA G E 5 4...

  • Page 55: Annex 2 Interfaces

    ANNEX 2 I N T E R F A C E S In the following, all interfaces of the system are described. A2.1 Extension Bus The Extension Bus socket is used to connect individual MAGIC units with the bus for the transmission of control signals and encoded audio data.. Connector: Extension Bus (25-pole SUB-D) Signal Electrical characteristics...

  • Page 56: A2.2 Audio Interfaces

    I N T E R F A C E S A2.2 Audio interfaces A2.2.1 AES/EBU interface The AES/EBU interface is used for the transmission of digital audio and addi- tional data. Socket: Digital audio interface (XLR) Signal Electrical characteristics Level: V.11, symmetrical, Input galvanically decoupled...
  • Page 57 I N T E R F A C E S In this operating mode, only the “LINE X.21” interface is available with data ra- tes from 64 to 1920-kbit/s. This is a DTE interface which requires as a trans- port medium a line in which the data is switched en bloc . Connector: X.21 Line (SUB-D 15 pole) Signal...

  • Page 58: Sampling Clock Output

    I N T E R F A C E S A2.4 Sampling clock output Socket: Sampling Clock Out (BNC) Signal Electrical characteristics Clock Amplitude: 0.5 to 1.9 Vp0 (input)) 1.5 Vp0 (output) 75 Ω, unsym. Impedance: A2.5 Data interfaces A2.5.1 HSD interface The HSD channel is intended for the transmission of high-speed data.

  • Page 59: A2.5.3 Additional Data

    A2.6.1 RS232C and RS232 AUX interfaces The RS-232C interface is for the configuration and monitoring of the codec from a PC The RS232 AUX interface in the Standard MAGIC ISDN is not pro- grammed. Connector: RS-232C (SUB-D 9 pole Signal...

  • Page 60: A2.6.2 Rs485 Bus Interface

    PC (this interface should not be mistaken for the internal RS485 interface of the Extension Bus that is used to configure individual plug-in units (PCBs). In the Standard MAGIC ISDN, this interface is not programmed.
  • Page 61 I N T E R F A C E S The interface can also be used to control external equipment. There are 10 outputs, 5 inputs, 8 programmable inputs/outputs, GND and +5V. Socket: User I/O (SUB-D 25pole) Signal Electrical Electrical STROBE Level: TTL / CMOS...
  • Page 62 I N T E R F A C E S PA G E 6 2...

  • Page 63: Annex 3 User I/O Interface Applications

    ANNEX 3 U S E R I / O I N T E R F A C E A P P L I C A T I O N S The 25-pole USER I/O interface can be programmed for various different ap- plications.

  • Page 64: Printer Mode

    U S E R - I / O I N T E R F A C E A P P L I C A T I O N S Remark If the pins 10 or 15 are used, the following circuit is recommen- ded (it can also be used for the other pins): Input (e.g.
  • Page 65 ANNEX 4 L I S T O F T H E A L A R M S The following alarms can be displayed in the ALARM LIST panel: TABLE 2 FAULT MESSAGES FOR THE LAYER II/III CODECS IN THE ALARM LISTS PANEL Alarm text Meaning ENC DSP1 ..DSP4, DEC DSP1 Every signal processor has its own block counter that is polled by the microcontroller.
  • Page 66 L I S T T H E A L A R M S PA G E 6 6...

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