Clock Controller - Nortel Communication Server 1000 Manual

Clock Controller 113

Clock Controller
QPC775 or NTRB53
Clock Controller card(s) must be installed when DASS2 links are installed.
On some systems, card slots are dedicated for the Clock Controller.
For Large Systems, two Clock Controller cards are used for
synchronization; the Clock Controllers extend timing signals to multiple
groups via a junctor board. The QPC775E must be used on Large
Systems.
In a standalone switch or one with only analogue networking, the Clock
Controller is not normally fitted.
Synchronization between switches must always be provided in the case of
DASS2 trunks, and every digital network must be individually checked for
clocking configurations. If the system is to provide clocking over a link,
then there are no additional configuration changes required on the system.
If the system is to be synchronized to a particular link, then the associated
PRI card must be physically connected to the Clock Controllers of the
system.
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.
DIP switches are set on the Clock Controller card according to the system
type, and in systems with 3PE board(s), DIP switches must be set
accordingly on the 3PE.
Figure 31 "QPC775 Clock Controller faceplate layout" (page
114) illustrates the layout of a QPC775 Clock Controller faceplate.
Nortel Communication Server 1000
DASS2 Fundamentals
NN43001-571 04.01 4 June 2010
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