Installing Or Replacing The Qpc775 Or Ntrb53 On Multi Group System - Nortel Communication Server 1000 Manual

Installing or replacing the QPC775 or NTRB53 on Multi Group
System
Table 70
installing or replacing the QPC775 or NTRB53 Clock Controller
Step Action
1
Determine the cabinet and shelf location of the circuit card to be installed.
Note: The system contains card slots that are dedicated for the Clock Controller. The
card slot is number 9 on the Network shelf.
2
Unpack and inspect circuit cards.
3 Set option switches and insert option plugs on the Clock Controller being added. For
information about QPC775 switch settings, see
158).
4 For the QPC441 3PE cards in Network Shelves housing Clock Controller cards:
For models with a Clock Controller, set option switch positions 1 and 4 to OFF,
and positions 2 and 3 to ON.
For models without a Clock Controller, set option switch positions 1, 2 and 4 to
OFF, and position 3 to ON.
(Refer to QPC441 3PE card schematic.)
5
On the Clock Controller being added, set faceplate toggle switch to DISABLE.
6
When replacing an existing Clock Controller, make sure the existing card is software
disabled, using LD 60.
Note: ERR20 messages may be generated. These can usually be ignored. However,
excessive clock switching should be avoided, especially when counters are near the
maintenance or out-of-service thresholds.
Response: Excessive switching could generate threshold-exceeded messages or
cause the PRI to be automatically disabled.
Copyright © 2007, Nortel Networks
.

Installing or replacing the QPC775 or NTRB53 on Multi Group System 161

CAUTION
Service Interruption
If CC-0 is to be replaced, CC-1 and CPU-1 must be active.
Similarly, if CC-1 is to be replaced, CC-0 and CPU-0 must be
active.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
"QPC775E switch settings" (page