AVT MAGIC ISDN Service Manual download pdf (Page 19)

PAGE 19

System Description

2 SYSTEM DESCRIPTION

The block diagram of the system is shown in Fig. 2.

FIG. 2 THE BLOCK DIAGRAM OF THE MAGIC ISDN TELEPHONE HYBRID

2.1 Functionality

The Telephone Hybrid system has a maximum of four MAGIC ISDN Tele-

phone Hybrids, which are connected via the Extension Bus. Therefore a maxi-

mum of 8 S

interfaces as well as 4 analogue Audio inputs and Audio outputs

are available to the user. Additionally, a Handset or MAGIC Hybrid Headset can

be connected to the front side of the system.

With the optional AES/EBU/ANALOGUE Module, any part of the system can

be extended by two Audio inputs/outputs.

Via the Telephone Hybrid system - depending on the build - up to 16 callers

can be put On Air or in Pre Talk simultaneously. Additionally, there are con-

figurable call forwarding possibilities.

For each caller, a digital Echo Canceller is available. This echo canceller is nec-

essary to suppress disturbing echos when the caller is using a normal ana-

logue telephone.

Likewise, the Automatic Gain Control (AGC) can be switched on for each

caller.

To suppress disturbing noise from callers who are currently not speaking, the

Expander can be activated.

In the conference mode there is the possibility of mixing all callers digitally

2 x S

Line

interfaces

HSD (Relay)

TTL USER I/O

RS 232C

ISDN Module

Audio (CMD)

Standard

Audio

interface

DSP

Handset

AES/EBU

Module

AES/EBU

Channel 1

Channel 2

Analogue

Channel 1

Channel 2

- Echo Canceller

- N-1, AGC

- Digital Mixing

ANALOGUE

Audio codec

- Analogue Audio

- G.711 Codec

(Option)

LSD (Keypad)

basic construction

Extension Bus

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 169 170

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