Clock Source For Isdn Cards - Nortel Modular ICS 6.0 Installer's Manual

Nortel modular ics 6.0 digital system package

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52 / Welcome to ISDN

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 card. For example, if the

network connection is a loop found on the BRI Card in Slot 1,

the terminal connection must be a loop found on the same card

Clock source for ISDN cards

Systems with ISDN interfaces need to synchronize clocking

with the ISDN network and any connected ISDN terminal

equipment. Clocking synchronization is supported by either a

Combination Fiber 6-port Services Cartridge or a Services

The Modular ICS derives timing from the network using

U-NT and T reference points (loops). Terminal equipment on

U-LT and S reference points (loops) derive timing from the

Systems synchronize clocking to the first available, functional,

network connection. If there are excessive errors on the

Modular ICS 6.0 Installer Guide