Avaya BCM 2.0 Programming Betriebsanweisung PDF herunterladen (Seite 379)

Appendix B: ISDN Overview 379

P0911588 Issue 01 Enterprise Edge 2.0 Programming Operations Guide

A T loop provides lines that can be shared by all Enterprise Edge telephones,

peripherals and applications, and ISDN TE.

A T loop can be used in combination with an S loop to provide D-packet service for

a point-of-sale terminal adapter (POSTA) or other D-packet device. D-packet

service is a 16 kbps data transmission service that uses the D-channel of an ISDN

line.

To deliver D-packet service, a network connection (T loop) is programmed to work

with a terminal connection (S loop). The loops must be on the same physical

module.

Clock Source for ISDN

SystemswithISDNinterfacesneed to synchronize clockingwiththe ISDN network

and any ISDN terminal equipment connected to the network. Systems synchronize

clocking to the first functionally available network connection. If there are

excessive errors on the reference network connection, the next available network

connection is used for clock synchronization. The clock synchronization process

generates alarm codes and event messages. Clock synchronization is supported by

the Digital Trunk Media Bay Module, BRI S/T Media Bay Module and the Fiber

Expansion Media Bay Module.

The Enterprise Edge derives timing from the network using T reference points

(loops). Terminal equipment on S reference points (loops) derive timing from the

Enterprise Edge system.

When you configure the network connections to the Enterprise Edge, you should

take into account the system preferences for selecting loops for synchronization:

• lower numbered loops have preference over higher numbered loops

• the loop preference order is: 201, 202, 203, 204 etc.

• the system skips S and analog loops on Mod2 Card 1, when selecting a network

connection for synchronization

SystemswithonlySloopsact as timingmastersfortheattached terminal equipment

(TE), and are not synchronized to the network. ISDN TE without access to a

network connection (BRI lines) has limited or no functionality.

network

connection

ISDN

Enterprise Edge

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Avaya BCM 2.0 Programming Betriebsanweisung Seite 379