Clock Synchronization; Clock Controller Maintenance Commands - Nortel Communication Server 1000 Manual

172 IDA status check and start-up

Clock synchronization

Synchronization between switches must always be provided in the case
of DASS2 trunks, and every digital network must be individually checked
for clocking configurations.
QPC775 Clock Controller cards must be installed in half group and single
group systems, when a DASS2 link is installed. On multi group systems,
two Clock Controller cards are used for synchronization. On multi group
systems supporting EuroISDN applications, the QPC775E Clock Controller
card is required.
In a standalone switch or one with only analogue networking, the Clock
Controller is not normally fitted.
In a dual processor system, the synchronization link must be connected to
both Clock Controllers to allow for change over. The Clock Controller(s) can
be connected to two synchronization links, the second being programmed
to provide the system clocking if the first choice fails.
If the system is to provide clocking over a link, then there are no additional
configuration changes required. If the system is to be synchronized to a
particular link, then the PRI must be physically connected to the Clock
Controller of the system.

Clock Controller maintenance commands

Clock Controller maintenance is performed using LD 60.
controller commands available in LD 60" (page 172)
of commands and status messages available in LD 60.
Table 78
Clock controller commands available in LD 60
Command
DIS CC N
DSYL L
ENL CC N
ENYL L
EREF
MREF
Copyright © 2007, Nortel Networks
.
Description
Disable specified system clock controller.
Disables remote alarm processing for loop L.
Enable specified system clock controller.
Enables remote alarm processing for loop L.
Enables automatic switching and recovery of primary and secondary
reference clocks when loops associated with these clocks are
automatically enabled.
Disables automatic switching and recovery of the primary and
secondary reference clocks when loops associated with these clocks
are automatically disabled or in local alarm.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 02.01 Standard
Release 5.5 7 December 2007
Table 78 "Clock
provides a general list