Clocking requirement, Connecting mgc dect clock reference cable – Nortel Networks 1000 User Manual

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NT5D11 and NT5D14 Lineside T1 Interface cards

equipment. Terminating calls are incoming to the terminal equipment. The
Lineside T1 card does not support battery reversal answer and disconnect
supervision on originating calls.

After the software is configured, power up the card and verify the self
test results. The STATUS LED on the faceplate indicates whether or not
the Lineside T1 card has passed its self test, and is functional. When
the card is installed, this LED remains lit for two to five seconds as the
self-test runs. If the self-test completes successfully, the LED flashes
three times and remains lit. When the card is configured and enabled in
software, the LED goes out. The LED goes out if either the motherboard or
daughterboard is enabled by the software. If the LED flashes continuously
or remains weakly lit, replace the card.

Clocking Requirement

The clocking for NT5D14 Lineside T1 Interface card in CS1000 Rls 5.0
system is as follows:

•

Lineside T1 cards are clock master of their T1 link, which has a clock
accuracy requirement of +/-50ppm

•

MGC does not provide a backplane clock with +/-50ppm accuracy at
freerun

•

An accurate clock source is needed for Lineside T1 application

The following are the two methods to bring an accurate clock source to
MCG:

•

Configure a digital trunk card with Clock Controller within the same
cabinet/chassis as Lineside T1 cards.

With Clock Controller enabled, in both freerun or locked state, an
accurate clock will be provided to MGC.

•

Use an MGC DECT Clock Reference Cable (NTDW67AAE5) to bring
a clock source from other CS1000 cabinet/chassis that has a Central
Office Link.

With accurate clock source available, MGC will lock to the reference
and provide an backplane clock as accurate as the clock source.

Connecting MGC DECT Clock Reference Cable

The following sections elaborate on how to connect an MGC DECT Clock
Reference Cable.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008