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

176 IDA status check and start-up
Table 97
IDA trunk maintenance messages available in LD 75 B-Channels (cont'd.)
Message
ENBL IDLE
ENBL BUSY
ENBL MBSY
DSBL RST, ENBL IDLE RST,
ENBL BUSY RST,
ENBL MBSY RST

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 176)
of commands and status messages available in LD 60.
Table 98
Clock controller commands available in LD 60
Command
DIS CC N
Description
Enabled and available for a call.
In use for a call.
Maintenance busy; that is, unusable.
Being reset; that is, unusable.
Description
Disable specified system clock controller.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 04.01 4 June 2010
Copyright © 2007-2010 Nortel Networks. All Rights Reserved.
Table 98 "Clock
provides a general list