AVT MAGIC ISDN Hardware Description

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MAGIC

ISDN

Audio Transmission System

Hardware Description

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MAGIC ISDN

AUDIO TRANSMISSION SYSTEM AS PER ISO/MPEG STANDARD LAYER II/III AND ITU-RECOMMENDATIONS G.722, G.728 AND G.711

HARDWARE DESCRIPTION

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Acknowledgements LabWindows is a reg is ter ed tra de mark of National Instruments

AVT Audio Video Technologies GmbH

Rathsbergstrasse 17 D-90411 Nuernberg Telefon (0911) 5271-0 Telefax (0911) 5271-100 Internet: www.avt-nbg.de Email: [email protected]

Printed in Germany, April 1997

 AVT Au dio Video Te chnologies

The information contained in this publication is accurate to the best of our knowledge. However, we disclaim any liability resulting from the use of this information and reserve the right to make changes without notice.

Order number

040 7448 33964 6 (0 6- 0 0)

HW MAGIC ISDN

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CONTENT

1 QUICK INTRODUCTION 11

1.1 Transmission of a stereo signal via 2 ISDN B channels (PC control) 12

1.1.1 Connection of the components 12

1.1.2 Putting into operation 13

1.1.3 Setting up the call 13

1.1.4 General advice on dialing using the PC software 14

1.2 Transmission of a stereo signal via two ISDN B channels 15

1.2.1 Connection of the components 15

1.2.2 Putting into operation 15

1.2.3 Setting up a connection using a stored calling number 16

1.2.4 Setting up a manually dialled call 18

1.2.5 General advice on dialing using the Display and Keypad 18

1.3 Factory settings 20

1.3.1 Interface Unit factory settings 20

1.3.2 Codec factory settings 20

2 SYSTEM DESCRIPTION 21

2.1 General 21

2.2 System concept 22

2.3 Construction of MAGIC ISDN Audio Codec 22

2.3.1 Additional options for transmission at higher data rates 23

2.4 Interface Unit 24

2.5 The ‘Layer II/III Audio Codec ’ 27

2.6 The ‘Layer II/III Audio Decoder’ 28

2.7 The ‘ Audio Layer II/III Analog I’ Board 29

2.8 Example of a MAGIC system connection 30

3 PUTTING THE MAGIC SYSTEM INTO OPERATION 31

3.1 Construction of the MAGIC Audio Codec 31

3.2 Selection of the network interface 32

3.3 Connection to the data network 32

3.4 Applications with MAGIC ISDN and MAGIC Systems 33

3.4.1 Generel Transmisssion applications in different qualities 33

3.4.2 Transmission via an X.21 channel at up to 1920-kbit/s 34

3.4.3 Transmission of an audio signal with the signalling switched off35

3.4.4 Audio transmission via ISDN 36

3.5 Connection to the mains voltage 37

3.6 Opening the Device 37

3.7 Setting the centre-tap earth for the analogue audio inputs 38

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CONTENT

3.8 Switching on the system 38

4 OPERATION WITH THE OPERATOR PANEL 39

4.1 Menu tree 40

4.2 The main menu 41

4.3 Submenus 42

4.4 Entering the commands 43

4.5 Programming example: Storing calling numbers 43

4.6 Programming example: setting the RS232C for control via a PC 45

ANNEX 1 TECHNICAL DATA 49

A1.1 Interface Unit with variable network access 49 A1.2 Audio Codec Layer II / III 50 A1.3 Analogue Unit for Audio Codec Layer II / III 51 A1.4 Power supply 52 A1.5 Dimensions 52 A1.6 Miscellaneous 52 A1.7 Additional features 52 A1.8 Ordering information 53

ANNEX 2 INTERFACES 55

A2.1 Extension Bus 55 A2.2 Audio interfaces 56

A2.2.1 AES/EBU interface 56 A2.2.2 Analogue Audio interface 56

A2.3 Network interfaces 56 A2.3.1 So interfaces 56 A2.3.2 X.21 interfaces 56

A2.4 Sampling clock output 58 A2.5 Data interfaces 58

A2.5.1 HSD interface 58 A2.5.2 LSD interface 58 A2.5.3 Additional Data 59

A2.6 Operator interfaces 59 A2.6.1 RS232C and RS232 AUX interfaces 59 A2.6.2 RS485 bus interface 60 A2.6.3 User I/O interface 60

ANNEX 3 USER I/O INTERFACE APPLICATIONS 63

A3.1 Logic level transfer Mode 63 A3.2 Printer mode 64

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CONTENT

ANNEX 4 LIST OF THE ALARMS 65

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CONTENT

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PAGE 1 1

QUICK INTRODUCTION

1 QUICK INTRODUCTION

This chapter contains the most important steps required for the transmission of an analogue stereo signa l via ISDN. SECTION 1.1 describes the procedure to be used if a control PC has been connected to the MAGIC system. SECTION 1.2 explains the steps for contro l with the oper ator pa nel (wi thout a PC). With the exception of the connection between PC and MAGIC system, the installation is identical in both cases.

With the respective page, carry out the described steps point by point. P lease ensure that the installation is also carried out at the remote e nd. The system s at both ends do not have to be controlled by a PC.

The call set up can be from eithe r side. Th e called equipment accepts the call automatically .

If the transmission should be in only on e direction, then only one signal sour ce and one signal sink are used.

The factory settings are listed at the end of the chapter.

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QUICK INTRODUCTION

1.1 Transmission of a stereo signal via 2 ISDN B channels (PC control)

FIGURE 1.1 THESE CABLES MUST BE CONNECTED

1.1.1 Connection of the components

(1) Mains cable: Use the mains cable provided. (2) PC connection: Connect a free interface of the PC with the socket on

the MAGIC system labelled

RS232 C

. (3) Connect the MAGIC ISDN to the S0 socket(s). (4) Connect the audio signal

source

(transmit sound) to the sockets #1

(left) and #3 (right) of

slot 2

(5) Connect the audio signal

sink

(receive sound) to the sockets #2 (left)

and #4(right) of

slot 2

Transmit sound, right analogue Transmit sound, left analogue

Received sound, right a nalogue

Received sound, left an alogue

MAGIC control

RS232C

Line X.21 HSD LSD

Additional Data

Slot 2 Slot 3RS232-AuxRS485

Extension Bus

TTL User I/O

Handset

ISDN 1 ISDN 2 ISDN 3

Clock Out

CMD In CMD Out Left In Left Out Right OutRight In Aux In Aux OutDig In Dig Out

Dig In Dig Out

Slot 2 Slot 3

ISDN

(1)

(2)

(3)

(4)

(5)

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QUICK INTRODUCTION

1.1.2 Putting into operation

(1) Switch on the MAGIC system (mains switch at front) (2) Switch on the PC. (3) Install the PC operating software (remember to make a backup copy!):

– Insert disk – Install the software on the hard disk by typing

CKPUVCNN

– When the required directory is requested, simply press RETURN

and the software is installed in the default directory which is shown in brackets.

(4) Start the program :

OCIAKUFP

OCIAO

, depending on which version is required. In the lower right corner of the screen, the message PCCONN indicates that the connection between PC and MAGIC system is in order.

FIGURE 1.2 AFTER SWITCHING ON, THE SYSTEM TAKES APPROXIMATELY 60 SECONDS T O BOOT UP.

DURING THIS TIME THE MESSAGE PC-DROP IS DISPLAYED IN T HE LOWER RIGHT CORNER OF THE PC SCREEN.

(5) To avoid faulty i nstallation, first of all l oad the fa ctory setting s: click with

the mouse on the word CONF IG in the top row of the scr een. Under the pull-down menu which opens, move the mouse pointer to FACTORY SETTINGS and click on this. The settings are now loaded.

1.1.3 Setting up the call

(1) To set up the charge display, click on the CHARGES key. In the panel

which opens you can enter the cur rent CH ARGE FACTOR. Thi s fa ctor is the cost for each charge unit. Additionally, under CURRENCY, the currency to be d is played can be e nter ed. Th e se ttings are immediately stored in non-volatile memory.

REMARK

With the 1TR6 national protocol, the charging impulses are normally provided . With DSS-1 p rotoc ol, these must be requested.

(2) Change to the LINE pa nel a nd se lect yo ur ISDN protocol. The settings

are immediately stored in non-volatile memory.

(3) Activate the CALL panel: click the word CALL in the top row of the

screen with the mouse.

(4) If the MAGIC System is conne cted thr oug h a PABX, the prefi x nu mber

for the outside line can be entered under PREFIX NO.

(5) Open the window for the entry of numbers: Click the MANUAL CALL

key in the right part of the screen.

(6) Enter the calling numbers:

– AREA CODE: Enter the (country and) area codes – NUMBER 1: Calling number of the first B channel – NUMBER 2: Calling number of the second B channel

(7) Set up the call: Click the CALL key with the mouse

The remote side must al so be operational an d have the factory settin gs loaded.

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QUICK INTRODUCTION

(8) Check the connection: The MAIN panel appears on the screen. The

status of the interfaces a nd the diall ed number i s displayed here (CONNECT = connection made) and the number dialled.

Transmit signal

Start the audio signal sources and sinks at both en ds of the transmission p ath.

Disconnect the call

Click the word DISC! in the top line of the screen. The call is cleared down.

1.1.4 General advice on dialing using the PC software

(1) When a direct line is use d, the prefix number to obtain an e xchange line

through a P ABX can be suppresse d if the calling number is pr eceeded with a “-” sign. This is important if the call is to be set up within the PABX. The minus sign should only be added to the first number. This display can be reached when entering the calling number, by pressing the key.

(2) If you want to se t up a norm al telephone con nection, it must be ensured

that this is done using the so-called Telephone Service Indicator. The selection of the Telephone Service Indicator occurs when a “T” sign is added before the first entered calling number. Without the “T” sign the “Data” Service Indicator is always dialled.

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QUICK INTRODUCTION

1.2 Transmission of a stereo signal via two ISDN B channels

(control with operator panel)

FIGURE 1.3 THESE CABLES MUST BE CONNECTED

1.2.1 Connection of the components

(1) Mains cable: Use the mains cable provided. (2) Connect the MAGIC ISDN to the S0 socket(s). (3) Connect the audio signal

source

(transmit sound) to the sockets #1

(left) and #3 (right) of

slot 2

(4) Connect the audio signal

sink

(receive sound) to the sockets #2 (left)

and #4(right) of

slot 2

1.2.2 Putting into operation

(1) Switch on the MAGIC system (mains switch at front) (2) Load the MAGIC ISDN factory settings:

– : Press “right” cursor five times (* now next to

MEM) – : Press “down” cursor once – : Press “right” cursor twice (* is now at INIT) – : Press Enter. The factory settings are loaded.

(3) Set up the call: this can be done by choosing a programmed calling

number (see SECTION 1.2.3) or b y directly ente ring the calling number (see SECTION 1.2.3).

Transmit sound, right analogue Transmit sound, left analogue

Receive sound, right analogue

Receive soun d, l eft analogue

RS232C

Line X. 21 HSD LSD

Additional Data

Slot 2 Slot 3RS232- A uxRS485

Extension Bus

TTL User I/O

Handset

ISDN 1 ISDN 2 ISDN 3

Clock Out

CMD In CMD Out Left In Left Out Right OutRight In Aux In Aux OutDig In Dig Out

Dig In Dig Out

Slot 2 Slot 3

ISDN

(2)

(1)

(3)

(4)

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QUICK INTRODUCTION

1.2.3 Setting up a connection using a stored calling number

Keys Display Remarks

Main men u

Starting point. If another menu is dis pl ayed, press the Escape key to call up the main menu.

Press the “down” cursor key to display the

CALL

submenu.

With the “right” cursor key, select the

SET

menu item.

Press the “down” cursor key to display the

SET

submenu.

With the “down” cu rsor key, sel ect the

NRS

menu item.

)

With the “right” and “left” cursor keys, select the required service:

DATA

: Call with Data Indicator (Default 1..6B)

TEL:

Call with Telephone Indicator (1B)

Press the “down” cursor key to display the

DATA

submenu.

Enter the (country and) area code

Display the

AREA

submenu by pressing

Enter.

bis

Enter the count ry and/or area code with th e keys 0 to 9.

Confirm the number wit h Enter . The submenu

NRS

is then automatically displayed.

Enter the calling numbers

( )

With the “right” and “left” cursor keys, select the requi r e d nu m ber from N1 to N6. Display the submenu with Enter.

bis

Enter the calli ng number without coun try or area code.

Confirm the entered number with Enter. The submenu

NRS

is automatically called up.

To enter further calling numbers, select the number from N1 to N6 and proc ee d as desc ribed above.

Enter only the first two numbers!

With the “up” cur sor ke y, display the

SET

sub-

menu.

*CALL RD DIS CFG SYS MEM Call menu

*NAME MAN CONN SET ANSW Call by name

NAME MAN CONN *SET ANSW Set call-by-name memory

*NRS MODE SAVE ERASE Set call numbers

*DATA TEL Set data call

*AREA N1 N2 N3 N4 N5 N6 Area code

Enter area code: 0911

0 9

*AREA N1 N2 N3 N4 N5 N6 Area code

Enter phone number: 9952705

0 9

AREA *N1 N2 N3 N4 N5 N6 Number 1

*NRS MODE SAVE ERASE Set call numbers

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QUICK INTRODUCTION

Saving

( )

With the “right” and “left” cursor keys, select the

SAVE menu

Select the

SAVE

submenu with the E nter key.

Enter the name ass ociated with the c alling number. The selection of lett ers and other character s is by repeated pressing of the “up” and “down” cursor keys. For a name with more than one character , change the c ursor posi tion with th e “right” and “left” cursor keys.

Confirm the configuration name with Enter. The successful stora ge is indi cated on the di splay. Press any key to automatically call up the

SET

submenu.

With the “up” curs or key, activate the

CALL

submenu.

Set up the call

Select the

NAME

menu item with t he “left” and

“right” cursor keys.

( )

Press the “down” cursor key to disp l ay the

NAME

submenu.

Select the required name with the “left” and “right” cursor keys and confirm with Enter. A call is set up to the number stored under this name.

The remote end must also be operational an d have the factory sett ings loaded.

Check the connecti on

In the second lin e of the dis pl ay,

Connect 2B

should appear.

Transmit the signal

Start the audio s ignal sources and sin ks at both ends of the transmission route.

Disconnect the call

Main menu. From any other menu, press the Escape key to call up the main menu.

Press the “right” cursor key to select the DISC menu item.

Confirm with the Enter key. The connection is cleared down.

Keys Display Remarks

NRS MODE *SAVE ERASE Save call-by-name data?

Enter call name: TESTLOOP

Call data stored! Press any key!

NAME MAN CONN *SET ANSW Set call-by-name memory

*NAME MAN CONN SET ANSW Call by name

Select call data: TESTLOOP

*CALL RD DIS CFG SYS MEM Connect 2B

CALL RD *DIS CFG SYS MEM Disconnect line

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QUICK INTRODUCTION

1.2.4 Setting up a manually dialled call

1.2.5 General advice on dialing using the Display and Keypad

(1) The exchange line number ca n onl y be en tere d using th e PC sof tware

(important only for PABXs).

(2) When a direct line is use d, the prefix number to obtain an e xchange line

(3) The setting up of the chargin g factor and the curren cy for a charge unit

is also only possible using the PC software.

(4) All calling numbers can be ente red by the PC software and transferre d

afterwards to the MAGIC ISDN System.

Keys Display Remarks

Main men u

Starting point. If another menu is dis pl ayed, press the Escape key to call up the main menu.

Press the “down” cursor key to display the

CALL

submenu.

With the “right” cursor key, select the

MAN(ual)

menu item.

Press the “down” cursor key to display the

MAN(ual)

submenu.

With the “right” cursor key, select the

128k

menu item (for a 2B channel connection).

The entry of the number is reques ted by pressing Enter.

bis

Using the keys 0 to 9, enter the required number complete with country and/or area code.

Confirm the number wit h Enter. The connection will be set up immediately.

The remote end must also be operational and have the factory settings loaded.

Check the connection

In the second line of the dis play,

Connect 2B

should appear.

Transmit the signal

Start the audio signal sources and s inks at both ends of the transmission route.

Disconnect the call

Starting point. If another menu is dis pl ayed, press the Escape key to call up the main menu.

Press the “right” cursor key to select the DISC menu item.

Confirm with the Enter key. The connection is cleared down.

1 This can also be done REMOTELY by our Service, in case PC Software is not to hand.

*CALL RD DIS CFG SYS MEM Call menu

*NAME MAN CONN SET ANSW Call by name

NAME *MAN CONN SET ANSW Manual call

*TEL 64k 128k Telephone call

TEL 64k *128k 128kbit data call

Enter phone number:

0 9

Enter phone number: 09119952705

TEL 64k *128k Connect 2B

CALL RD *DIS CFG SYS MEM Disconnect line

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QUICK INTRODUCTION

(5) 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 MUSICTA XI or CDQ1000) fo r the far end shoul d be stored. Follow ing the entry of the calling number, the correct configuration can immediately be stored with it. To do this do not store the calling number immediately it is entered but first change to the

MODE

menu.

REMARK

The majority of Audio Codec manufacture rs use proprietar y signaling modes. If a call should fail, knowledge of the remote end mode enables the MAGIC ISDN System to be correctly configured. When making a call however, one must be certain that the equipment at bo th ends u ses the sam e signaling mode. S ince with the majority of modes, automatic mode identification is not possible, disconnection follows within one second when the required signaling identification is not received. If however, a normal telephone is called from MAGIC, this is recognised by all modes as the recognised service indicator preceeds the dialling.

Press the “down” cursor key to disp l ay the

MODE

submenu .

)

With the “right” and “left” cursor keys, select the required conf iguration. The choice of c onfigurations mus t have been stored previously. The configuration names will then be displ ayed.

After selecting the configuration and pressing the , the number can be saved as described above.

NRS *MODE SAVE ERASE Set call numbers

Select configuration: 0: <<FREE>>

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QUICK INTRODUCTION

1.3 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 Command channel: Switched off LSD channel: Switched off LSD Mode: V.24 (transparent channel) Handshake: Switched off HSD (X.21)-Mode: Switched off HSD Data rate: 1∗64 kbit/s ISDN Protocol: not set with FACT. SETTINGS

1.3.2 Codec factory settings

Encoder input: Main analog Main output: Decoder analog Coding Mode: Layer III Digital output mode: Professional Auxiliary output: Switched off Command channel:: Normal Input impedance: 15 kΩ Nominal audio input level: 6 dBu Nominal audio output level: 6 dBu Sampling frequency: 48 kHz Coding mode: Joint Stereo Original signalling bit: Copy CRC check: Switched on Copyright indication bit: Switched off AES/EBU CLOCK: Automatic Additional data channel: Switched off Additional data rate: 2400 Baud

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SYSTEM DESCRIPTION

2 SYSTEM DESCRIPTION

2.1 General

Due to the cost advantages offered by the efficient utilisation of available transmission capacities, low-bit-rate encoding is becoming increasingly important for the transmission of aud io signals. The MAGIC system (Multi Audio system with Groupable Interfaces and Codecs) was developed for this reason. With the system, high-quality audio signals can be transmitted bidirectionally in CD-transparent qual ity. Its main application is the transmission of one or more channels via ISDN, satellite or data networks.

All standardised methods of data reduction for audio signals (ITU-T G.711, G.722, G.728, ISO/MPEG Layer II (DAB) and III) are integrated into the MAGIC system. The p rocedures which ensure secur e and synchr onous transmission also comply with international standards and recommendations (ITU-R J.52), thus guaranteein g the future -oriented concept of th e MAGI C system as well as its compatibility with all systems implementing these standards

REMARK

In order to be able to make full use of the functions of the MAGIC audio system, we reco mm end that you r ead chap ters 2 and 3 first.

FIGURE 2.1 MAGIC ISDN UNIT

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SYSTEM DESCRIPTION

2.2 System concept

Using the ISDN Codec over its X .21 interface, up to 1 0 encoded audio si gnals can be transmitte d over a da ta network. The a dditional Code cs are connecte d to the MAGIC ISDN system over an extension bus. More comprehensive information on the MAGIC EXTENSION system is contained in the MAGIC BASIC System Hardware Description. The special features of the MAGIC ISDN Audio Codec are as follows.

2.3 Construction of MAGIC ISDN Audio Codec

The

/#)+% +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. FIGURE 2.1shows the closed housing of the

+5&0

unit, FIGURE 2.2 shows the open view of the e quipment. FIGURE 2.3 is a rear view of the system with th e various connectors. FIGURE 2.4 is a view of the system with the front panel and display removed. Shown here are board mounting slots 1 to 3. These mouting slots can be variously equipped.

FIGURE 2.2 VIEW OF THE OPENED HOUSING OF THE MAGIC ISDN SYSTEM

Fans

Front panel display wi th keypad

Slots for the plug-in units

Slot for po w er supply

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PAG E 2 3

FIGURE 2.3 REAR VIEW OF THE MAGIC SYSTEM

FIGURE 2.4 MAGIC SYSTEM WITHOUT FRONT PANEL

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.

REMARK

The individual plug-i n units (PCBs) have a slot cod ing that prevents insertion into the w rong slot. The PCB s should n ever be inserted forcibly, since this could damage the multipoint connectors.

2.3.1 Additional options for transmission at higher data rates

In networks operating at higher data rates (e.g. X.21 to 1920-kbit/s), MAGIC can be used to transmit several high-quality audio signals simultaneously. A number of MAGIC system units can be cascad ed for this pu rpose (maximum of 10). Some additional settings must be made as compared with the trans-

Slot Equipping variations Order Number

1 Interface unit 229671 2 Audio codec Layer II/III digital

Audio encoder Layer II/III digital

229660 340463

3 Audio codec Layer II/III digital

Audio encoder Layer II/III digital Audio Layer II/III analogue I

229660 340463 322930

Audio interfaces Earthing screw

Fuse

RS232C

Line X.21 HSD LSD

Additional Data

Slot 2 Slot 3RS232-AuxRS485

Extension Bus

TTL User I/O

Handset

ISDN 1 ISDN 2 ISDN 3

Clock Out

CMD In CMD Out Left In Left Out Right OutRight In Aux In Aux Ou tDig In Dig Out

Dig In Dig Out

Slot 2 Slot 3

Power supply

Slot 3

Slot 2

Slot 1

Fan

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PAGE 24

SYSTEM DESCRIPTION

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 comprehensiv e advice on the connecti on of MAGIC Extension un its please refer to the MAGIC BASIC Hardware Description.

REMARK

At any given time in the 1x X.21 mode, all audio inputs must receive the same type of audio signals, i.e. e ither analogu e or digital. If one input is switched fr om anal ogue to digital or viceversa, all other inputs are also switched.

2.4 Interface Unit

In addition to the network interfaces, the Interface Uni t provides a wide range of data interface s for the tra nsmission of user data in a ddition to the e ncode d audio data. A further audio codec has been integrate d to operate an independant command channel. This audio codec supports the audio encoding standards G.71 1 (3.1-kHz bandw idth), G.728 (3.1-kHz bandwidth at 16 -kbit/s) an d G.722 (7-kHz bandwidth).

For ISDN transmission, an up to six-fol d inband signa lling (J.52 ) has been implemented. This signalling enables, on the one hand,

byte

-synchronisation

which is lost at an X.21 interface, and on the other hand, a synchronisation

between the individual data channels

, which is required because of the di f-

ferent transmit times in ISDN.

For X.21 transmission, J.52 inband signalling is used to guarante e frame synchronisation and to report the assignment of the individual timeslots of the frame to the remote end. If the J.52 signalling is switched off, a maximum of one encoded audio signa l can be tr ansm itted. In this case, the fr aming of the data signal is guaranteed by the ISO/MPEG framing.

A multiplex frame of th e X.21 signal at 1920-kbit/s con sists of 30 timeslots with 8 bits each. The frame length is 125 µs (the frame frequency is 8kHz). The structure is shown in the following figure:

FIGURE 2.5 MULTIPLEX FRAME OF THE X.21-SIGNALS (I.E. 1920-KBIT/S)

Timeslot 1 contains the J.52 inband signalling (1.6-kbit/s). The remaining

62.4-kbit/s can be filled with a single Low Speed Data channel or a single Command channel as per G.711, G.728 or G.722.

1 2 3 4 5 1 2 3 4 527282930

Timeslot

Frame 125 µs

Bit2 Bit3 Bit4 Bit5 Bit6 Bit7 Bit8Bit1

Frame 2 Frame 3

Frame 78 Frame 79 Frame 80

Frame 1

Frame 16

5 2

LSD and CMD

LSD: Low Speed Data channel (e.g. for remote control

)

CMD: Command channel G.728, G.711 or G.722

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PAG E 2 5

SYSTEM DESCRIPTION

Network interfaces

The following network interfaces are available:

–1 × X.21, n × 64-kbit/s to 1920-kbit/s –3 × So (ISDN)

Data interfaces

The MAGIC ISDN Audio code c has two d i f fere nt data inter faces ava ila ble for the transmission of additional data. All interfaces are implemented as DCEs.

– HSD for High Speed Data, 64 kBit/s – LSD for Low Speed Data between 300 and 38400Baud.

Operator interfaces

The following four operator interfaces are available for the control of the MAGIC ISDN Audio Codec:

– User I/O – RS.232C – RS232-AUX (on request) – RS 485 (on request)

FIGURE 2.6 shows the block diagram of the int erface unit. The main e lements are the

,2TQ\GUUQT

and the

&GOWZ &52

The J.52 DSP handles the imp limentation of the J.52 as well as control of the complete system. The Dem ux signal processor handles the complete data multiplexing including the delay compensation for ISDN connections. To retain the maximum flexibility, extensive use is made of

2TQITCOOCDNG .QIKE

QORQPGPVU

The

2..

Block

RTQXKFGU VJG KORQTVCPV ENQEMU UWEJ CU VJG

48-kHz sampling clock for the Audio Codec and the different clocks that are necessary for X.21 operation. The

#WFKQ &52

provides the coding according to the ITU-T-Standards G.711,

G.722 and G.728. Based on the u se of an i n dividual

#&&# %QPXGTVGT

the Command channel can operate in parallel with the ISO/MPEG Layer II/III Audio Codec. The

&KIKVCN +1

block generates the control signal for the

1RGTCVQT

block. in this

block, exactly as in the

.KPG &CVC

and

'ZVGPUKQP $W

s blocks, the necessary inter-

face adaptations are implimented. The only exception to be noted is the

.KPG

$NQEM

. In this block an individual pr ocessor is incorporated to handle the access of up to six ISDN B channels. Here however , only the evaluation of th e D channel protocol is carried out. The actual user data is routed via the programmable logic to the signal processor for processing.

Page 26

PAGE 26

SYSTEM DESCRIPTION

FIGURE 2.6 BLOCK DIAGRAM OF THE INTERFACE UNIT

DSP-Bus

Operator

Line

Data

Ext. Bus

A/D-D/A

Converter

Demux-DSP

Audio-DSP

J.52-DSP

RS232C RS485 Keyboard Display

3 x So 1 x X.21

LSD HSD

to Codec

Command channel

Digital au dio

24.576 MHz

7...9 MHz

Data signals

Digital IO

Programm.

Logic

PLL

Page 27

PAG E 2 7

SYSTEM DESCRIPTION

2.5 The ‘Layer II/III Audio Codec ’

The Audio Codec plug-in unit enables the transm ission of audio signa ls at low bit rates, as is required for ISDN, for examp le. A reduction by a factor of 1 1 for Layer III and by a factor of 6 for Layer II is ac hieved without any loss in quality. The encoding is in accordance with the ISO/IE C 11172-3 standar d as we ll as the DAB ETS300401 standard.

Besides the audio channel, there is an additional data channel with a maximum data rate of 9.6-kBaud and 38.4-kBaud for DAB, which can be used to transmit program-accompanying information, for example.

A digital, professional AES /EBU interface has been impli mented as in put and output for the audio signal.

FIGURE 2.7 shows the block diagram for this unit. T he

'PEQFGT

is implimented

with four signal processors whereas the

&GEQFGT

uses a single signal processor. On the basi s of this relat ively high processing power , in general, futu re coding algoriths can be implimented. The controlling element of this unit is the

*QUV RTQEGUUQT

. This microcontroller loads the software for the Co dec from th e Flash -Eproms, mo nitors the Codec and configures it. Under special control registers (De-emphasis, Mux, Level) the analogue card is likewise controlled. The clock can be provided in two ways: synchronous with the network clock (only 48-kHz sampling frequency) or asynchronous with the network clock using a

8%1

. In the second case, a qu asi-synch ron ous p roced ure is pr ovi ded by a control algorithm in the Decoder. The Audio data signals can be provided to the codec either from the Analogue card or the

#'5'$7

interface.

The data exchange with the interf ace unit is over the

'ZVGPUKQP$WU

. Besides the data and clock signals (RXD, TXD, X21_CLK, Clk_Syn) the data request signals (TXD_V, RXD_v) are still required as well as a bi-directional communications channel (XD, XC).

FIGURE 2.7 BLOCK DIAGRAM OF THE LAYER II/III AUDIO CODEC

Encoder

Layer II/III

Decoder

Layer II/III

V.24

TTL

V.11

TTL

V.11

TTL

V.11

TTL

V.24

TTL

V.11

TTL

UART

PCB-Address

VCO

Clock Mux

Host

Control

AES/

EBU

AES/

EBU

Select Sampl. Clk

RXD

Dig. Aud. Data

Deemph.

Mux Level

Sampl. Clk (asyn.)

RTS

TXD

TXD_V

RXD_V

X21_Clk

Clk_Syn

RXD

TXD

Sampl. Clk (syn.)

Encoded Audio Data

Transmit Clk

AES/EBU Clk

Audio In

Audio Out

Data to D/A-Converter

Data from A/D-Converter

Hostbus

Add. Data

Ext. Bus

Dig. Aud. Data

Encoded Audio Data

Page 28

PAGE 28

SYSTEM DESCRIPTION

2.6 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 decode d. FIGURE2.8 shows the block diagram of the Decoder. The functionality corresponds with the Codec unit, except that it is not equipped with the Encoder.

FIGURE 2.8 BLOCK DAIGRAM OF THE LAYER II/III AUDIO DECODER

Decoder

Layer II/III

V.11

TTL

V.11

TTL

V.24

TTL

V.11

TTL

UART

PCB-Address

VCO

Clock Mux

Host

Control

AES/ EBU

Select Sampl. Clk

Dig. Aud. Data

Deemph. Mux Level

Sampl. Clk (asyn.)

RXD_V

X21_Clk

Clk_Syn

RXD

TXD

XD XC

Sampl. Clk (syn.)

Transmit Clk

Audio Out

Data to D/A-Converter

Hostbus

Add. Data

Ext. Bus

Encoded Aud io Data

Page 29

PAG E 2 9

SYSTEM DESCRIPTION

2.7 The ‘ Audio Layer II/III Analog I’ Board

This Analogue board provides the user with earth-free and symmetrical inputs/outputs for the Audio signals. Additional possibilities are setting levels, selecting impedance, multiplexi ng variou s Audio signals and level mon itoring.

The possibility exists via jumpers, for mid-point earthing of the Audio signals at the main audio interface. The jumpers are marked on the printed circuit board. As delivered, the mid-point earthing is not jumpered (see SECTION 3.7).

FIGURE 2.9 shows the main components o f the Anal ogue boa rd. The c ontrol of the Analogue card is from the Codec unit over the so-called Host- Bus. MUX and DEMUX are arranged via an Audio crossb ar, through which the different Audio signals can be switched.

FIGURE 2.9 BLOCK DIAGRAM OF AUDIO LAYER II/III ANALOG I BOARD

Level control from Codec Host

Main In Analog Command channel from IFE

AUX In

Mux/Demux control from Codec Host

to Codec Host

to Encoder DSP

Deemphase control from Codec Host

from Dec. DSP

Main Out

Analog

Level control from Codec Host

to Codec Host

Command channel to IFE

AUX Out

Level cont r ol

-12 dBr

U X

D E M U X

Level control

-12 dBr

Page 30

PAGE 30

SYSTEM DESCRIPTION

2.8 Example of a MAGIC system connection

The connection of the MAGIC ISDN statio n shown here is an examp le. Not all the units shown are always connected. Nevertheless, the varied possibilities of which MAGIC ISDN is

simultaneously

capable of are illustrated.

FIGURE 2.10 CONNECTION OF A MAGIC ISDN UNIT WITH ANALOGUE INPUT AND OUTPUT EINGANG

AND TRANSMISSION OVER AN ISDN DIAL-UP CONNECTION

ISDN

LSD-data

Additional data for Audio signal (e.g. RDS,PAD)

Transmit sound right analogue

Command channel transmit

Command channel receive

Transmit sound left analogue

Receive sound right analogue Receive sound left analogue

Main monitor (transmitted sound)

Receive so und (right/le ft digital)

e.g. to printer

4GEQTFGT

12:03

Remote control

Connection of MAGIC ISDN

MAGIC control

RS232C

Line X.21 HSD LSD

Additional Data

Slot 2 Slot 3RS232-AuxRS485

Extension Bus

TTL User I/O

Handset

ISDN 1 ISDN 2 ISDN 3

Clock Out

CMD In CM D Out Left In Left Out Right OutRight In Aux In Aux OutDig In Dig Out

Telephone

Dig In Dig Out

Slot 2 Slot 3

reporting

Page 31

PAG E 3 1

3 PUTTING THE MAGIC SYSTEM INTO

OPERATION

This chapter describes how a MA GIC ISDN un it is pu t into oper ation . The following plug-in unit equipping is used as an example:

– Slot 1: Interface Unit – Slot 2: Audiocodec Layer II/III digital – Slot 3: Audio Layer II/III analog I (optional)

3.1 Construction of the MAGIC Audio Codec

With its dimensions of 439 mm × 133 mm (3 HE) × 395 mm (W × H × D), the MAGIC system can either be operated as a table-top device or be inse rted into 19" or ETSI racks using mounting brackets.

The dimensions given above are valid for the table-top version with neither mounting brackets nor feet. If the MAGIC system is to be inser ted into a rack, it should be remembered that the bending radi us of the cables shoul d always be greater than the minimum allowed value.

If the MAGIC system is installed in a rack, it should also be ensured that sufficient ventilation is provided. It is recommended that at least 3 cm space is left. As a rule, the ambient temperat ure should not lie out side the range +5°C to +40°C. These limits are of particular im port ance if the MA GIC system is inserted in a rack.

During operation, the re lative humidi ty must lie betwee n 5% and 85%. Operation of the MAGIC system outside the above-mentioned limits is not allowed and invalidates the warranty (guarantee ).

FIGURE 3.1 REAR VIEW OF THE MAGIC SYSTEM

RS232C

Line X.21 HSD LSD

Additional Data

Slot 2 Slot 3RS232-AuxRS485

Extension Bus

TTL User I/O

Handset

ISDN 1 ISDN 2 I SDN 3

Clock Out

CMD In CMD Out Left In Left Out Right OutRight In Aux In Aux OutDig In Dig Out

Dig In Dig Out

Slot 2 Slot 3

Page 32

PAGE 32

3.2 Selection of the network interface

The MAGIC ISDN Audio Cod ec offer s the operato r two types of net work inte rface. However, only one interfa ce type can b e active at a gi ven tim e. T he n etwork interface should be selected to meet the particular requirements.

The following is an over view of typical applicat ions fo r the d iffere nt network interfaces of the MAGIC system:

3.3 Connection to the data network

The selected network interface should be connected with the transmission equipment in acco rdance with the i nterface pi n assignm ent (see Appendi x for the pin assignments). When the So interface is selected, care is to be taken that the connections are in numerical order. That is, in every case, ISDN No. 1 must be connected. Should a 4 B-channel connection be required correspondingly, the ISDN No. 2 interface is connected.

Network interface Application

X.21 Data interface n × 64-kbit/s, n = 1 to 30,

Block swit ching required,

3 x So ISDN interface with 6 B channels, 64-kbit/s each,

Transit time compensation between the individual channels is imnplimented.

Page 33

PAG E 3 3

3.4 Applications with MAGIC ISDN and MAGIC Systems

Some application examples with MAGIC syste ms are sho wn in the following . In these examples, the nece ssary connectio ns correspo nding to your applications can be seen.

3.4.1 Generel Transmisssion applications in different qualities

FIGURE 3.2 GENERAL TRANSMISSION APPLICATIONS WITH MAGIC ISDN

The MAGIC ISDN system is fully compatible with the AVT 15-kHz ISDN Telephone. The system automatically detects which e ncoding should be selecte d. If you use the optionally available telepho ne 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.

Analogue/ISDN 3.1-kHz Telephone

MAGIC ISDN System

MAGIC COMPACT 7-kHz

ISDN channel B1

J.52

Audio

LSD

ISDN 1B-Channel assignment (optional data channel)

RS232C

Line X. 21 HSD LSD

Additional Data

Slot 2 Slot 3RS232-AuxRS485

Extension Bus

TTL User I/O

Handset

ISDN 1 ISDN 2 ISDN 3

Clock Out

CMD In CMD Out Left In Left Out Right OutRight In Aux In Aux OutDig In Dig Out

Dig In Dig Out

Slot 2 Slot 3

7-kHz ISDN Telephone

Telephone handset

&#64GEQTFGT

12:03

Active loud speaker

+5&0



Page 34

PAGE 34

3.4.2 Transmission via an X.21 channel at up to 1920-kbit/s

FIGURE 3.3 Transmission of up to 10 audio channels via an X.21 channel at max. 1920-kbit/s

In this operating mode, up to 10 Audio Codecs can be conn ected to the extension bus of the MAGI C 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.

Remark

The 1920-kbit/s datar ate is a softwar e option w hich can ce o btained under order number 333475. Without this software option, the maximum transmission data rate is up to 384 kbit/s.

POWER 115/230V

0 I

LEFT OUTPUT RIGHT

OUTPUT CMD INPUT

EXTENSION BUS

USER I/O X.21/SLAVE 4 X.21/SLAVE 2 X.21/MAIN

X.21/SLAVE 1X.21/SLAVE 3X.21/SLAVE 5

LSD

RS232C

ADD.DATA

MAGIC System control

MAGIC Extension

COMPACT D

Extensio n Bus

Satellite

downlink

Satellite

uplink

Loudspeaker, modulator

X.21 Line t o 1920-kbit /s (max. 10 Audio signals)

max. 10 St er eo Audio sou r ces

TTL remote commands

RDS Data

X.21-Line to 1920-kbit/s (max. 10 Audi o signals)

MAGIC COMPACT D

PHILIPS

TS 1 TS 2 TS 3 TS 4 TS 30TS 29..........

J.52 Audio 1 Audio 1 Audio 2 Audio 10Audi o 10

..........

Possible channel allocation:

MAGIC ISDN

Page 35

PAG E 3 5

3.4.3 Transmission of an audio signal with the signalling switched off

FIGURE 3.4 Transmission of an audio signal without J.52 signalling

In this operating mode, 1 audio programme can be transmitted via a leased line at a data rate of 64 to 384-kbit/s (for Layer III, up to 256-kbit/s).

POWER 115/230V

0 I

LEFT OUTPUT RIGHT

OUTPUT CMD INPUT

EXTENSION BUS

USER I/O X.21/SLAVE 4 X.21/SLAVE 2 X .21/MAIN

X.21/SLAVE 1X. 21/SLAVE 3X.21/SLAVE 5

LSD

RS232C

ADD.DATA

MAGIC Syste m co nt r ol

Loudspeaker, modulator

Transmission of an Audio programme

(for MAGIC COMPACT D)

MAGIC ISDN

Adapter cable X.21 <--> Ext. Bus

nx64-kbit/s leased line

(n=1...6)

X.21 cable

(for MAGIC COMPACT DDC, DD)

X.21 cable

left right

Audio

Channel assignment for leased line operation and Layer II encoding:

Audio Audio Audio Audio Audio

RS232C

Line X.21 HSD LSD

Additional Data

Slot 2 Slot 3RS232-AuxRS485

Extension Bus

TTL User I/O

Handset

ISDN 1 ISDN 2 ISDN 3

Clock Out

CMD In CMD Out Left In Left Out Right OutRight In Aux In Aux OutDig In Dig Out

Dig In Dig Out

Slot 2 Slot 3

TS 1 TS 2 TS 3 TS 4 TS 5 TS 6

Page 36

PAGE 36

3.4.4 Audio transmission via ISDN

FIGURE 3.5 A

UDIO TRANSMISSION VIA

ISDN

WITH

2 B

CHANNELS

In this application, the uni-directional transmission of a high-quality audio signal 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 384kbit/s. For all six B -channels, a transit tim e delay com pensation i s carr ied out. Then a "Capability Exchange" takes place in which the terminals exchan ge information on their encoding and decoding capabilities. At the end of this procedure, the audio signals are transmitted in the best possible mode (unless this is limited by the use of further data services). If MusicTAXI signalling has been selected, a 2B connection is set up. Several features such as an additional "Low Speed Data" channel or the complete remote control of systems are therefore not possible in this mode.

RS232C

Line X.21 HSD LSD

Additional Data

Slot 2 Slot 3RS232-AuxRS485

Extension Bus

TTL User I/O

Handset

ISDN 1 ISDN 2 ISDN 3

Clock Out

CMD In CMD Out Left In Left Out Right OutRight In Aux In Aux OutDig In Dig Out

Dig In Dig Out

Slot 2 Slot 3

POWER 115/230V

0 I

LEFT OUTPUT RIGHT

OUTPUT CMD INPUT

EXTENSION BUS

USER I/O X.21/SLAVE 4 X.21/SLAVE 2 X.21/MAIN

X.21/SLAVE 1X. 21/SLAVE 3X.21/SLAVE 5

LSD

RS232C

ADD.DATA

Loudspea ker, modulator

Transmission of an Audio programme

MAGIC ISDN

left right

#inclu

TA MULTI

ISDN channel B1 ISDN channel B2

J.52

Audio

LSD

ISDN 2B channel assignment (optional data channel and command channel):

CMD

MAGIC Sy stem contro l

+5&0

Page 37

PAG E 3 7

3.5 Connection to the mains voltage

The MAGIC system can be oper ated with an AC voltage (mains) between 90 and 253 V without the need for switching. The mains frequency can vary between 45 Hz and 65 Hz. The power consumption is a maximum of approx. 70 W. The housing must be earthed (grounded) in accordance with local regulations. This earthing is usually realised via the protective conductor (green/yellow) of the mains cable. If the mains cable does not have a protective conductor, however, the device must be earthed via the earthing screw (see FIGURE 3.1).

NOTE

Use the mains cable provided! Do not use an extensi on cable without a prote ctive conductor! If in doubt, use ad ditional GND!

3.6 Opening the Device

NOTE

The device must be discon nected from mains b efor e it is opened!

Although a large part of the system configuration can be carried out fro m the outside using software, it is sometimes necessary to open the device. To do this, remove the four sc rews on the fr ont p anel . The p anel ca n now b e pull ed out by the handles. The keypad/display unit can also be removed. The individual plug-in units are inserted horizontally and can easily be removed or inserted using the lever provided.

NOTE

Dangerously high voltages can still be present on the power supply even several minutes after it has been disconnected from the mains. Do not, therefore, touch any component or soldering point on the power supply!

The plug-in units of the System can be seen in the table in SECTION 2.2.

To re-assemble the unit, carry out the above steps in reverse order.

Page 38

PAGE 38

3.7 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, cent re-tap earthing is not selected.

FIGURE 3.6 JUMPERS ON THE PLUG-IN UNIT AUDIOCODEC LAYER II/III ANALOGUE I

3.8 Switching on the system

After all required interfa ces have been connect ed, the system can be switched on. The following message appears on the front panel display:

After a few seconds, the main menu appears:

The system is now ready for oper ation a nd the f irst conn ection ca n be set up.

1WV

Signal present

Level monitoring

activated

**** M A G I C 6 B **** BOOTING SYSTEM...

*CALL RD DIS CFG SYS MEM SYSTEM BOOTED

Page 39

PAG E 3 9

OPERATION WITH THE OPERATOR PANEL

4 OPERATION WITH THE OPERATOR PANEL

The menus that can b e called up from t he operat or (front) pa nel are described in the following sections.

FIGURE 4.1 OPERATOR PANEL OF THE MAGIC AUDIO CODEC

The MAGIC operator panel consists of a two-line display with 24 characters per line, a keypad with the digits 0 to 9, an Enter key, a cursor block and an Escape key.

In addition, the operator panel has two LEDs The „Power“ LED lights when th e unit is in operation, and the „Error“ LED lights up if there is a system alarm.

Page 40

PAGE 40

OPERATION WITH THE OPERATOR PANEL

4.1 Menu tree

The different men us di splaye d in the MAGIC oper ator pane l are o rga nised in a tree structure. The root of the tree structure is the main menu, which is displayed when the system is switched on:

Main menu

The first line of a displayed menu always contains the functions or subm enus that can be activated. The second line contains additional information on the currently selected men u item. T he cu rsor block keys ar e used to move to the required menu item in the menu tree.

By pressing the or

key,

the neighbouring menu item (to the right or left)

is selected (horizontal movements in the menu tree). The asterisk

(∗)

indicates

the currently selected menu item.

With the key, th e selected submenu can be called up. The key calls up the previous menu (vertical movement in the menu tree).

The Return (Enter) key confirms a selection (e.g. activate s a selected network interface) or a menu item that requires the entry of data (e.g. a calling number). Such menu item s are always i ndica ted with a “?” in the second line of the display. The Escape key exits a data entry menu or calls up the main menu from any other location in the menu tree .

Every pressing of a key is acknowledged acoustically.

The menu structure makes it possible to change individual parameters directl y without having to repeat all settings.

The main menu consists o f five submenus. These are described brief ly on the following page. Th e com plete me nu tree is shown diag ram mat ical ly i n Ann ex

4.1, Page 46 to Annex 4.5, Page 50. This list is to be used as a reference if settings are to be made. The list shows all menu levels down to the l ast level. The individual possible selections in the last level are not shown in the list.

Remark

SECTION 4.5 contains an example of how letters and other characters can be entered via the operator panel..

*CALL RD DIS CFG SYS MEM Call menu

Page 41

PAG E 4 1

OPERATION WITH THE OPERATOR PANEL

4.2 The main menu

The main menu consists of five m enu items that are exp lained in the followi ng.

CALL

From this menu item:

– NAME can be selected if 1..6∗X.21 has been set as the line interface, – A connection can be set up (CONN) for all other line interface settings, – A calling number can be stored (SET), – The automatic call answering can be switched on or off.

ReDial

)

selecting this menu item redials the last connection dialled.

DISC

DISConnect

)

selecting this menu item disconnects all existing connections.

CFG

ConFiGuration

)

With this parameter:

– Layer III/ISO/MPEG audio codecs (AUDIO) can be configured – The command channel (BACKCH) can be configured – The High-Speed and Low-Speed data channels (DATA) can be set

SYS

SYStem settings

)

All system parameters can be set and displayed.

– Display of the current alarms (ALARM) – Setting of all interfaces (IFACE), including the audio interfaces – Switching of test loops (LOOP) – Setting and polling of unit parameters (ETC), such as software version

MEM

MEMory settings

)

This menu item is used to mana ge the 10 memo ry location s av ailabl e for the storing of configurations. The following functions are provided:

– Loading a configuration (LOAD). – Saving a configuration (SAVE). – Initialise unit (INIT). – Select unit default setting (DF).

Most of these menu items are self-explanatory and easy to use. The procedure for storing calling numbers and unit configurations is described in SECTION 4.5.

Page 42

PAGE 42

OPERATION WITH THE OPERATOR PANEL

4.3 Submenus

Some specific submenu functio ns are de scribed in more deta il here. In gen eral, the description o f the PC user in terface comman ds (see Software Descr iption) can be used, since the designations are almost identical in most cases.

NAME

In the ISDN dialling mo de, the nam e of a pr eviously sto red part ner can be selected.

MAN

Under manual call, the number of a partner which has not been previously stored, can be entered and called directly. Any telephone or 64-kbit/s or 128kbit/s data connection is possible.

CONN

To activate connections that are not set up via ISDN such as X.21 connections, CONN must be pressed at both ends.

ANSW

For a dialled call to be answered automatically, ANSW must be switched on.

ALARM

Alarms which are present are displayed.

LOOP

– LOCAL The signal is looped back at the network interface. The data

stream is fed into the tr ansmission path an d is also retu rned to the Interface Unit.

– REMOTE The incoming data stream is retu rned to the t ransmission path.

The local MAGIC station receives th e incoming signal,which is returned to the remote station. This test involves the trans mission route.

– OFF No loop is switched. This setting should always be selected

before the panel is exited.

Remark

The loop is always of the active network interface. Please ensure that no loop is set when the panel is exited.

DISP

The value in brackets shows the currently set display contrast.

CTRL

The settings for the transmission parameters (MODE, RATE, BITS, PARITY) of the RS232C (V24) and the RS485 (RS) interfaces can be made with this function. For the RS485 interface, this is the only setting possibility.

Attention

STR (string format) should never be selected under MODE, since the control PC will not function in this setting.

Page 43

PAG E 4 3

OPERATION WITH THE OPERATOR PANEL

4.4 Entering the commands

To set a function, search for the corresponding menu in the menu tree (displayed diagrammat ically from page 4-47 to page 4 .51) and ca ll up the function using the cursor keys provided on the keypad. Make the setting and confirm with Return. The following two sections contain examples of operator panel entry.

4.5 Programming example: Storing calling numbers

Keys Display Remarks

Main menu This is the starting point of the menu tree.

To obtain this menu from any other menu, press the escape key .

Activate the

CALL

submenu by pressing

the „down“ curosr key.

With the „right“ cursor key, select the

SET

menu item.

Press the „down“ cursor ke y to call up the

SET

submenu.

Call up the

NRS

submenu by pressing

the „down“ cursor key

)

Mark the required servic e with the „right“/ „left“ cursor keys:

DA TA

: Call with data service indicator

(SI)(Default 1..6B)

TEL:

Call withTelephone SI (1B)

Press the „down“ cursor key to select the

DA T A

submenu.

Entering the Country Code and the Local Area Code

Call up the

AREA

submenu with the

Enter key.

bis

Enter the country code and/or the local area code with the keys 0 to 9.

Confirm with the Enter key. The

NRS

submenu is then a utomatically calle d up.

Entering the calling number

( )

Use the „right“ / „left“ cursor keys to select the required number N1 to N6. Call up the submenu with Enter.

*CALL RD DIS CFG SYS MEM Call menu

*NAME MAN CONN SET ANSW Call by name

NAME MAN CONN *SET ANSW Set call-by-name memory

*NRS MODE SAVE ERASE Set call numbers

*DATA TEL Set data call

*AREA N1 N2 N3 N4 N5 N6 Area code

Enter area code: 0911

0 9

*AREA N1 N2 N3 N4 N5 N6 Area code

Enter phone number: 9952705

Page 44

PAGE 44

OPERATION WITH THE OPERATOR PANEL

The calling numbers are now stored under the desired names.

bis

Enter the callin g number (wi thout country code and local area code) and confirm with Enter.

The

NRS

submenu is then automat ically

called up. T o enter further c alling numbe rs, select a

number from N1 to N6 and proceed as described above.

Return to the

SET

submenu with the „up“

cursor key.

Selecting the unit configuration

( )

With the „right“ / „left“ cursor keys, select the

MODE

menu and then press E nter to

call up the

MODE

submenu.

( )

MODE submenu

With the „up“ and „down“ cursor keys, select the required configuration and confirm with Enter. The

SET

submenu is

then called up automatically. This configuration must then be saved.

Saving

( )

Select

SAVE

with the „right“ / „left“ cursor

keys and call up the

SA VE

submenu with

Enter.

Enter a name for the dialled connection. The letters and characters are selected by repeatedly pressing the „up“ / „down“ cursor keys. If the name consists of several characters, use the „left“ / „right“ cursor keys to pla ce the cu rsor accordingly .

Confirm the configuration name with Enter. A message appears to indicate that the data has b een stor ed. Pr ess any key to return to the

SET

submenu.

Main men u

Pressing the Escape key calls up the main menu, starting point for the other settings.

Keys Display Remarks

0 9

AREA *N1 N2 N3 N4 N5 N6 Number 1

*NRS MODE SAVE ERASE Set call numbers

NRS *MODE SAVE ERASE Set call mode

Select configuration: MUSICTAXI

NRS MODE *SAVE ERASE Save call-by-name data?

Enter call name: TESTLOOP

Call data stored! Press any key!

*CALL RD DIS CFG SYS MEM Call menu

Page 45

PAG E 4 5

OPERATION WITH THE OPERATOR PANEL

4.6 Programming example: setting the RS232C for control via a PC

Key Display Remarks

Main menu This is the starting point of the menu tree.

T o obtain this menu fro m any other menu press the Escape key .

Calling up the CTRL submenu

With the “right” cursor key, select the

SYS

menu.

SYS submenu Activate the

SYS

submenu by pressing

the “down” cursor key.

With the “right” cursor key, select the

IFACE

menu.

IFACE submenu Press the “d own” cursor key to call up the

IFACE

submenu.

With the „right“ cursor key, select the

CTRL

menu.

CTRL submenu Press the “down” cursor key to call up the

CTRL

submenu.

Choosing the interface to be set

( )

With the „right“ / „left“ cursor keys, select the required interface (e.g.

V24

Meanings: V24 RS232C serial interface RS RS485 bus interface TTL User I/O interface

With the „down“ cursor key , select the appropriate submenu.

*CALL RD DIS CFG SYS MEM Call menu

CALL RD DIS CFG *SYS MEM System setups/tests

*ALRM IFACE LOOP ETC Show alarms

ALRM *IFACE LOOP ETC Interface setups

*LINE AUDIO DATA CTRL Line interface select

LINE AUDIO DATA *CTRL Ctrl interface setup

*V.24 RS TTL Setup V.24-Ctrl

*V.24 AUX RS TTL Setup V.24-Ctrl

*MODE RATE BITS PARITY Set packet/string mode

Page 46

PAGE 46

OPERATION WITH THE OPERATOR PANEL

Setting the Mode (string / packet)

( )

With the „right“ / „left“ cursor keys, select the MODE menu.

( )

MODE submenu Press the “down” cur sor key to call up t he

MODE submenu. The star stands at the presently selected mode.

With the „right“ and „ left“ cursor key s, select

PKT

(packet format) and conf irm with

Enter.

Press the “up” cursor key to return to the

selected interface.

Setting the data rate

( )

With the „right“ / „left“ cursor keys, select the RAT E menu.

( )

RATE submenu

Press the “down” cur sor key to call up t he RATE submenu. The star stands at the presently selected data rate.

With the „right“ and „ left“ cursor key s, select the

192

data rate (=19200 Baud) and

confirm with Enter.

Press the “up” cursor key to return to the

selected interface submenu.

Setting the data format

( )

With the „right“ / „left“ cursor keys, select the BITS menu.

( )

BITS submenu

Press the “down” cur sor key to call up t he BITS submenu. The star stands at the presently selected format.

With the „right“ / „left“ cursor keys, select the 8 bit format and confirm with Enter.

Press the “up” cursor key to return to the

selected interface.

Key Display Remarks

*MODE RATE BITS PARITY Set packet/string mode

*STR PKT String format?

*MODE RATE BITS PARITY Set packet/string mode

MODE *RATE BITS PARITY Select rate

*3 12 24 48 96 192 384 300 baud?

MODE *RATE BITS PARITY Select rate

MODE RATE *BITS PARITY Set 7/8 bits

*7 8 7 bit format?

MODE RATE *BITS PARITY Set 7/8 bits

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PAG E 4 7

OPERATION WITH THE OPERATOR PANEL

The configuration of the RS232C user interface is now completed.

Setting the parity

(RS232C only)

( )

With the „right“ / „left“ cursor keys, select the

PARITY

menu.

( )

PARITY submenu Press the “down” cursor key to call up the

PARITY

submenu. The star sta nds at the

presently selected parity. With the „right“ / „left“ cursor keys, select

the

NONE

parity and confirm with Enter.

Main menu

Pressing the Escape key calls up the main menu, starting point for the other settings.

Key Display Remarks

MODE RATE BITS *PARITY Set parity

*NONE EVEN ODD No parity?

*CALL RD DIS CFG SYS MEM Call menu

Page 48

PAGE 48

OPERATION WITH THE OPERATOR PANEL

Page 49

PAG E 4 9

TECHNICAL DATA

ANNEX1 TECHNICAL DATA

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) Signalling can be switched off with/without Bit-Inversion

Coding Algorithms

ITU-T-Recommendations G.722, G.711 or GSM (3.1-kHz coded at 16-kbit/s ) G.728 (3.1-kHz at 16-kbit/s)

Network interfaces

1 × X.21 Data rate n × 64-kbit/s to 1920-kbit/s

3 × So Protocol 1TR6, DSS-1

Additional data interfaces

LSD channel Data interface up to 64 kbit/s as per RS232C

with bit rate adaption

HSD channel X.21 data interface

for data rates from 64 kbit/s to 1920 kbit/s (at present 64 kbit/s)

Audio interface

Electrical, balanced input / output (XLR) Nominal level 2.75 dBu Impedance Input >12 kΩ

Output 600 Ω

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TECHNICAL DATA

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. 20 mono channels, or 10 stereo channels

A1.2 Audio Codec Layer II / III

Coding standard ISO/MPEG Layer III (as per ISO/IEC 11172-3)

ISO/MPEG Layer II (as per ISO/IEC 11172-3) DAB ETS 300 401

No. of channels 2 × mono or

1 × stereo

Data rates Layer II: 40-kbit/s to 384-kbit/s

Layer III: 40-kbit/s to 256-kbit/s

Sampling frequencies 32, 44.1 or 48-kHz (selecta ble) f or digi ta l input

48 kHz for analogue input

Modes of operation Mono L, Mono R, Mono (L+R)/2,

Dual channel, Stereo, Joint Stereo

Audio interface Digital input as per AES/EBU professional

Digital output as per AES/EBU professional

Data interface RS 232C for additional data

(variable baud rate)

Error detection CRC16 check in ISO/MPEG data stream

(switchable)

Measures taken on detection of errors

Muting / repetition

Bus system Internal bus

TABLE4.1 DELAY TIMES AT 48-kHZ Data rate L a yer III Layer II

64-kbit/s (Mono) ca. 290 ms 145 ms 128-kbit/s (Mono) ca. 250 ms 140 ms 192-kbit/s (Stereo) ca. 245 ms 135 ms 256-kbit/s (Stereo) ca. 230 ms 130 ms 320-kbit/s (Stereo) 130 ms 384-kbit/s (Stereo) 130 ms

}

bidirektional

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PAG E 5 1

TECHNICAL DATA

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)

Headroom +6 dB

Auxiliary input

Impedance >12 kΩ Nomin a l level 9 dBu

Outputs Symmetrical, floating audio interface (XLR),

centre-tap earthing selectable,

Output impedance low-impedance < 20 Ω

Nominal level –20 dBu to +12 dBu,

(settable)

Headroom +6 dB

Auxiliary output

Impedance 600 Ω Nomin a l level 9 dBu

Level monitoring

Inputs / outputs left channel, right channel

Threshold char. –12 dB below nominal level

Measures taken Alarm signal is output

Sampling frequencies 32-kHz; 44.1-kHz; 48-kHz

Equalisation Preemphasis none

Deemphasis To ITU-T J.17 or

50/15 µs

Frequency rangewithout coding 20 Hz to 20 kHz

with coding upper limit dependent on set data rate.

Typical examples:

approx. 20 kHz stereo for 192 kbit/s Layer III

approx. 15 kHz stereo for 128 kbit/s Layer III approx. 15 kHz mono for 64 kbit/s Layer III approx. 7kHz stereo for 64 kbit/s Layer III

Harmonic distortion K2 + K3 ≤ 0.025%

Signal-to-noise ratio approx. 80 dB unweighted, referred to

maximum output level

Crosstalk (L↔R) approx. 80 dB (at f = 10 kHz)

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PAGE 52

TECHNICAL DATA

Level deviation ± 0.2 dB over the entire frequency range

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. 70 VA

A1.5 Dimensions

Height 3 U (133 mm)

Width 449 mm (19" rack)

Max. depth 450 mm

Weight Dependent on configuration,

typically approx. 10 kg

A1.6 Miscellaneou s

EMC VDE 0878, limit class B

Electrical safety EN 60950

Noise emission Max. 30 dBA

Temperature +5 °C to 40 °C

Relative humidity 5% to 85%

A1.7 Additional features

Remote diagnosis and operation of the system via ISDN Software download or upgrade possible via ISDN

MAGIC PC operating softwar e with LabWindows® user interface with feat ures such as:

– Control and configuration of the system – Call number and dial-up management for ISDN transmissions – Automatic call setup and cleardown with timetable – Display of status parameters and alarm messages – Signal analysis using FFT

…

Page 53

PAG E 5 3

TECHNICAL DATA

A1.8 Ordering information

System Component Ordering number

MAGIC

$CUKE

789001 MAGIC 2-Mbit/s Multiplexer 789004 MAGIC

GZVGPUKQP

(with one Layer II/III Codec) 789003

MAGIC

GZVGPUKQP

(with two Layer II/III Codecs) 789007

MAGIC

+5&0

229600 MAGIC COMPACT “DDC” 229604 MAGIC COMPACT “DD” 229605 MAGIC COMP ACT “ D ” 229606 MAGIC COMP A CT “ 7kHz” 229607

Individual mod ul es

Codec Layer II/III 229660 Decoder Layer II/III 229640 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 MAGIC

DCUKE

unit front panel (with display) 326603

MAGIC

GZVGPUKQP

unit front panel (without display 326602

Cables

X.21 cable male/female 1.5 m 315148 TS16

→

X.21 328252

RS449

→

2 × X.21 328253

Connection cable MAGIC

DCUKE

→ MAGIC

GZVGPUKQP

1…4

incl. bus termination

332361

2-Mbit/s-cable (E1/T1), symmetric, open, 1m 719890 Extensi on-Bus to X.21 (only MAGIC Compact) 336259

Software update packages

Software update for MAGIC-ISDN

a Contains IFE-Software, Layer II Software, Layer III Software and PC-Software.

332338 Software update for MAGIC ISDN + 2MBit/s

332339

PC operating software

PC software ISDN 1…4 B channels 327729 PC software ISDN + 2-Mbit/s 331518

Descriptions

MAGIC Software D es cr iption (Germ an ) 336778 MAGIC Software D es cr iption (Engl ish) 336779

Page 54

PAGE 54

TECHNICAL DATA

Page 55

PAG E 5 5

ANNEX2 INTERFACES

In the following, all interfaces of the system are described.

A2.1 Extension Bus

The Extension Bus socket is used to connect indiv idual MAGIC units w ith the bus for the transmission of control signals and encoded audio data..

Connector: Extension Bus (25-pole SUB-D) Pin Signal Electrical characteristics

Shield Data rate: 64-kbit/s to 2.048-Mbit/s

(Total data rate with

J.52 data Level: V.11, symmetrical Protocol for RS-485:

1 Start bit

8 Data bits

1 Parity bit

1 Stop bit

Data rate: 19200 Bd

TXa Transmit Data

Ca Control

RXa Receive Data

CLK48a

Clock 256×48 kHz

a Is only used if more than four systems are connected to one bus

CLKa Clock Receive

7 8

GND Ground

TXb Transmit Data

Cb Control

RXb Receive Data

CLK48b

Clock 256×48 kHz

CLKb Clock Receive

CTa Control RS485-Bus

CTb Control RS485-Bus

C_DATAa RS485-Bus

C_DATAb RS485-Bus

RXD_Va Receive_D_Valid

RXD_Vb Receive_D_Valid

TXD_Va Transmit_D_Valid

TXD_Vb Transmit_D_Valid

FSa Frame_Sync

FSb Frame_Sync

CLK48a Clock 256×48 kHz

CLK48b Clock 256×48 kHz

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INTERFACES

A2.2 Audio interfaces

A2.2.1 AES/EBU interface

The AES/EBU interfa ce is used for the tra nsmissi on of digital au dio and ad di tional data.

A2.2.2 Analogue Audio interface

Remark

On the analogue unit, centre-tap earthing can be set using jumpers for the audio signals of the main audio interface. The jumpers are indicate d on the PCB. In the factor y setting, there is no centre-tap earthing.

A2.3 Network interfaces

A2.3.1 S o interf aces

A2.3.2 X.21 interfaces

The MAGIC audio system has one X.21 interface available. The X.21 interface allows access to transmission networks is a data interface with bit clock (a byte clock can be used if it is provided by the network).

Socket: Digital audio interface (XLR) Pin Signal Electrical characteristics Input

Level: V.11, symmetrical,

galvanically decoupled

GND Shield

RXD a Receive Data a

RXD b Receive Data b

Output

GND Shield

TXD a Transmit Data a

TXD b Transmit Data b

Socket: Analogue audio interface (XLR Pin Signal Electrical characteristics

Shield Level:

Input –6 dBu to +12 dBu Output –20 dBu to +12 dBu

Impedance:

Input >12kΩ/600

Ω

Output <20Ω sym.

Audio a In or O ut

Audio b In or O ut

Socket: 8 pole Western Socket Pin Signal Electrical characteristics

not connected Recommendation: I.430

Bit rate: B Channel: 2x 64-kbit/s

D Channel: 16-bit/s

not connected

Push

Page 57

PAG E 5 7

INTERFACES

In this operating mode, only the “LINE X.21” interface i s available with data rates from 64 to 1920-kbit/s. This is a DTE interface which requires as a transport medium a line in which the data is switched en bloc .

Connector: X.21 Line (SUB-D 15 pole)

Pin Signal Electrica l characteristics

SHIELD Shield Type: DTE

Level: V.11, symmetrical Data Rat: 64 to 1920-kbit/

Range: 100 m

Ta Transmit D ata a

Ca Controla

R a Receive Data a

I a Indicate a

S a Signal Element Timing a

B a Byte Timing a

GND Ground

T b Tran smit Data b

Cb Controlb

R b Receive Data b

I b Indicate b

S b Signal Element Timing b

B b Byte Timing b

not connected

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INTERFACES

A2.4 Sampling clock output

A2.5 Data interfaces

A2.5.1 HSD interface

The HSD channel is inte nded for th e tra nsmissi on of hig h-spe ed da ta. A t pr esent only a data rate of 64-kbit/s is available

A2.5.2 LSD interface

The LSD channel is used for the tran smi ssion of lo w-spe ed data or for the r emote control / diagn osis of the system a t the far (rem ote) end with the J.52 inband signalling protocol. Rem ote contr ol of the far en d system is po ssible between MAGIC systems. A software update of the far end (Remote Software Update) during transmission has also been implemented.

Socket: Sampling Clock Out (BNC) Pin Signal Electrical characteristics

Clock Amplitude: 0.5 to 1.9 Vp0 (input))

1.5 Vp0 (output)

Impedance : 75Ω, unsym.

GND

Socket: HSD (SUB-D 15-pole) Pin Signal Electrical characteristics

SHIELD Schirm Type: DCE

Type: V.11, symmetrical Data rate: 64 to 1536-kbit/s Range: 100 m

Ta Transmit a

Ca Controla

R a Receive a

I a Indicate a

S a Signal Element Timing a

B a Byte Timing a

GND Ground

Tb Transmitb

Cb Controlb

R b Receive b

I b Indicate b

S b Signal Element Timing b

B b Byte Timing b

not connected

Socket: LSD (SUB-D 9pole) Pin Signal Electrical characteristics

CD Carrier Detect Type: DTE

Level: V.24 Data rate: 300 to 38400 Baud Range: max. 15 m

RxD R eceive Data

TxD Transmit Data

DTR Data Term inal Ready

GND Ground

DSR Data Set Ready

RTS Request To Send

CTS Clear to S end

RI Ring Ind ication

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PAG E 5 9

INTERFACES

A2.5.3 Additional Data

The additional da ta interface is for the transmi ssion of program -accompanying information or RDS da ta. The data is transm itted in a data field in the encoded audio signal. In the decoder, the additional data is output in parallel with the audio signal.

A2.6 Operator interfaces

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 RS2 32 AUX in terfa ce i n the S tand ard MAGIC IS DN i s n ot programmed.

Connector: Additional Data Slot 1 – 3 (SUB-D 9 pole) Pin Signal v

Type: DTE Level: V.24 (RS-23 2C ) Data rate: 300 to 38400 bit/s Range: max. 15 m

RXD Receive Data

TXD Transmit Data

4 5

GND Masse

6 7

RTS Request To Send

8 9

Connector: RS-232C (SUB-D 9 pole Pin Signal Elektrische Eigenschaften

not connected Type: DTE

Level: V.24 Data rate: 300 to 38400 Baud Range: max. 15 m Protocol: 1 Start bit

7 or 8 Data bits

1 Parity bit

1 Stop bit

a Factory setting: 8 bits b the following parities can be set: none, even odd. Factory setting: “none” (no parity)

RXD Receive Data

TXD Transmit Data

DTR Data terminal ready

GND Ground

DSR Data set ready

RTS Request to send

CTS Clear to send

not connected

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INTERFACES

A2.6.2 RS485 bus interface

The RS-485 interf ace is a bu s inter face to co nnect sever al C od ecs in a ch ain and makes it possible to contro l them fr om a P C (th is interfa ce should not be mistaken for the internal RS 485 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.

A2.6.3 User I/O interface

The User-I/O interf ace is com patible w ith the para llel inter face of a PC or pri nter. A log printer can thus be connected without the need for adaptation.

Socket: RS-485 (SUB-D 9-pole Pin Signal Electrical characteristics

SHIELD Type: Bus

Level: V.11, symmetrical Data rate: 300 to 19200 Baud Range: 100 m

DATA A

CONTROL A

not connected

GND

DATA B

CONTROL B

not connected

not connectedt

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PAG E 6 1

INTERFACES

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) Pin Signal Electrical Electrical

STROBE Out Level: TTL / CMOS

Max. current: 20 mA

DATA 0 Out

DATA 1 Out

DATA 2 Out

DATA 3 Out

DATA 4 Out

DATA 5 Out

DATA 6 Out

DATA 7 Out

ACK In

BUSY In

PE In

SELECT In

FEED XT In / Out

ERROR In

RESET Out

+5V/50 mA Out

USER 0 In / Out

USER 1 In / Out

USER 2 In / Out

USER 3 In / Out

USER 4 In / Out

USER 5 In / Out

USER 6 In / Out

GND

Note: User 0 to 6 and Feed XT can be switched as inputs or outputs

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INTERFACES

Page 63

PAG E 6 3

ANNEX3 USER I/O INTERFACE APPLICATIONS

The 25-pole USER I/O interface can be programmed for various different applications. Three different interface modes are available:

– Command mode – Logic-level transfer mode – Printer mode

In the command mo de, the USER-I/ O interface sign als can be used to control the

local

codec. The leading and trailing edges of the si gnal (change of sign al

level from “0” to “1” and vice-versa) are evaluated.

In the logic-level transfer mode, the logic levels at the local inter face are transmitted to the remote end. This can be used to control

external unit s at the

remote e nd

. For operation with the PC, software can be used to set leve ls that are transmitted to the remote end or which are provided at the USER-I/O interface. Here also, the leading and trailing edges of the signal (change of signal level from “0” to “1” and vice-versa) are evaluated.

In the printer mode, the interface is configured as a Centronics interface. A printer such as an Epson FX 80 can therefore be connected for log printing without the need for adaptation.

A3.1 Logic level transfer Mode

To use this operating mode, set the CTRL opera ti ng m ode in th e ope rato r panel (SYS → IFACE → CTRL → TTL). If you are using a PC to control the sy- stem, set the TTL-INTERFACE MODE switch to LOGIC LEVEL TRANSFER (in the TTL-INTERFACE panel).

The logic signals fed i n by h ardwa re ( pins 10 , 11, 12, 13 and 15 at the USERI/O interface) are transmitted to the far end and are provided at the outputs DATA 0 to DATA 4 of the remote USER-I/O interface.

Remark

The default levels at the unconnected outputs (pin 10 to pin 15) correspond to those of a CENTRONICS printer interface:

Pin Pin

ACK +5V

BUSY GND

PE GND

SELECT GND

ERROR +5V

Page 64

PAGE 64

USER-I/O INTERFACE APPLICATIONS

Remark

If the pins 10 or 15 are used, th e following cir cuit is recomme nded (it can also be used for the other pins):

If this circuit i s no t u sed, the n t he pin should be con necte d via the switch to GND. The inverti ng ef fect of th e circuit sho uld b e noted.

Alternatively, logic levels set by software can be transmitted instead of input levels at the USER I/O interface. The system must be operated from the PC for this purpose (see the Software description).

A3.2 Printer mode

T o use t his operatin g mode, set the PRT op erating m ode in the ope rator panel (SYS → IFACE → CTRL → TTL). If you are using a PC to control the system, set the TTL-INTERF A CE MODE switch to PRINT ER (in the TTL- INTERF ACE panel).

The connected unit, e.g. printer, must have a Centronics interface and be capable of processing printer commands for printers such as the Epson-FX80.

GND

Input (e.g. ACK)

Page 65

PAG E 6 5

ANNEX4 LIST OF THE ALARMS

The following alarms can be displayed in the ALARM LIST panel:

TABLE2 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. If this value is not incremented by the

DSP every second, there is a fault in the DSP. The processor is not necessarily defective, the software could have crashed.

During the synchronisation phase, this fault message can appear briefly. DSP HOST ERROR The communication between microcontroller and a signal processor is faulty. SLOT ERR O R A fault occurred dur in g t he assignm ent of timeslot s to be occupi ed. DECODER NOT SYNCED The synchronisation with the MPEG audio data stream is faulty. RS485 The communication between In t erface Unit <-> Codec(s ) is faulty. A received co nfiguration message is f aulty. For certain user

entries (such as switch sine generator on/off or SAVE ON BOARD in the AUDIO panel) this fault message can be ignored. NO COMMUNICATION This message is generat ed b y the Interf ace Unit and means that the I nterface Unit cannot com m unicate with t he codec. If this

fault should persist (> 1 min.) the unit must be switched off. WRONG SAMPLING CLOCK The set sampling frequency is not the same as the sampling frequency of the received input data stream. This me ssage is, fo r

example, output if a CD player (44.1 kHz) is connected to the digital input but a sampling frequency of 48 kHz has been set.

From soft ware versi on 4.0, thi s m essage is us ed for the a ut omatic setting of t h e sampling frequency. If this fa ul t occurs even if

the analogue input is being used, then the network clock probably varying considerably. This fault always leads to loss of syn-

chronism in the decoder. AES/EBU IN The AES/EBU receiver is receiving either a faulty audio signal or no audio signal. LEVEL IN/OUT L/R In the past minute, the audio signal has not exceeded a specific signal level. FEPROM1/2 The Flash EPROMs cannot be written to (e.g. during software download). If this fault occurs, software cannot be downloaded

to the codec. EEPROM The configuration data cannot be read or stored. RAM Access to the RAM is faulty. NO CORRECT CODEC SW The software download was faulty.

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PAGE 66

LIST OF THE ALARMS