Nortel Networks 1000 - Manual (Page 346)

346 NT5D97 Dual-port DTI2 PRI2 card
Free run (non-tracking) mode
The clock synchronization of the can operate in free-run mode if:
• no loop is defined as the primary or secondary clock reference,
• the primary and secondary references are disabled, or
•
the primary and secondary references are in local (near end) alarm
Figure 95
Clock Controller primary and secondary tracking
Reference clock errors
CS 1000 software checks at intervals of 1 to 15 minutes to see if a clock
controller or reference-clock error has occurred. (The interval of this check
can be configured in LD 73).
In tracking mode, at any one time, there is one active clock controller
which is tracking on one reference clock. If a clock controller error is
detected, the system switches to the back-up clock controller, without
affecting which reference clock is being tracked.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.