Nortel Networks 311 Clocking Requirement

290 NT5D33 and NT5D34 Lineside E1 Interface cards
Clocking Requirement
The clocking for NT5D34 Lineside E1 Interface card in CS1000 Rls 5.0
system is as follows:
•Lineside E1 cards are clock master of their E1 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 E1 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 E1 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 61 "MGC DECT Clock Reference Cable" (page 291) 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 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.