Nortel Networks Circuit Card 311 User Manual

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NT5D11 and NT5D14 Lineside T1 Interface cards

The circuits receive outgoing call signaling messages from the controller
and return incoming call status information to the controller over the DS-30X
network loop.

Card control functions

Control functions are provided by a microcontroller and a Card LAN link on
the Lineside T1 card. A sanity timer is provided to automatically reset the
card if the microcontroller stops functioning for any reason.

Microcontrollers

The Lineside T1 card contains a microcontroller that controls the internal
operation of the card and the serial card LAN link to the controller card. The
microcontroller controls the following:

•

reporting to the CPU via the card LAN link:

— card identification (card type, vintage, serial number)

— firmware version

— self-test results

— programmed unit parameter status

•

receipt and implementation of card configuration:

— control of the T1 line interface

— enabling/disabling of individual units or entire card

— programming of loop interface control circuits for administration of

channel operation

— maintenance diagnostics

•

interface with the line card circuit:

— converts on/off-hook, and ringer control messages from the DS-30X

loop into A/B bit manipulations for each time slot in the T1 data
stream, using robbed bit signaling.

•

the front panel LED when the card is enabled or disabled by instructions
from the NT8D01 controller card.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008