Clocking Requirement 223
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 Interfacecard 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 forLineside T1 application
Thefollowing are the two methods to bring anaccurate 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 lockedstate, 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 clockas 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.

Pre requisites

The pre requisites for connecting an MGC DECT Clock Reference Cable
are the following:
•MGC DECT Clock Reference Cable--- NTDW67AAE5.
Figure 39 "MGC DECT Clock Reference Cable" (page 224) shows the
MGC DECT Clock ReferenceCable. It is used to provide clock reference
between CS1000 Media Gateway Cabinet/chassis.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
.