Software Description - Nortel DMS-100 Series Maintenance Manual

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Table of Contents

Table 9 FSP circuit breaker assignments

Software description

The following sections describe the software operation of the NTX146AA

feature package.

Interface to DS-1 links

The OPM provides an interface between the host controller and a maximum of

640 subscriber lines through the DS-1 links. The LCCs reassign data carried

over the 32 channels of a DS30A link to the 24 channels of an equivalent DS-1

link. The six additional channels are for intraswitching and signaling use.

LCC control data

Before a unit of the OPM changes to InSv, the LCM sends control data to LCC

for that unit. The control data indicates the number of DS-1 cards equipped

and the clock source the OPM must use. The LCM receives this data from the

host LTC/LGC. The host sends messages to the LCM unit during return to

service (RTS). The host also sends messages to the LCM unit. This event

occurs when the CC attempts to switch the LCM clock source from LCC to

The OPM software controls the LCC clock source, which is frequency-locked

to the primary DS-1 links. The OPM software does not control the LCC clock

source when the two units of the LCM are not active. When both units are not

active, LCM hardware forces each LCM unit to take a clock source from the

LCC. This clock source belongs to the LCM unit.

Other host office functions

The software resident in the host DMS-100 Family office controls the

following functions:

class-of-service

code interpretation

DMS-100 Family OPM Maintenance Manual ISN07 (TDM)/SN07 (DMS) and up

T-1 repeaters

T-1 repeaters

Functional overview 2-27

T-1 repeaters