Nortel Networks 1000 - Manual (Page 282)

282 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
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 E1 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.
Pre requisites
The pre requisites for connecting an MGC DECT Clock Reference Cable
are the following:
•
MGC DECT Clock Reference Cable --- NTDW67AAE5.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.