Nortel Circuit Card Installation Manual page 354

Page 354 of 906
Figure 77
Clock Controller primary and secondary tracking
Primary
clocking
source
Secondary
clocking
source
Reference clock errors
553-3001-211 Standard 3.00
NT5D97 Dual-port DTI2/PRI2 card
REF 1
Primary
Reference
REF 2
REF 1
Secondary
Reference
REF 2
CS 1000 Release 4.5 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
August 2005
Primary
Primary
Secondary
Secondary
Clock
Controller 0
J1
J2
J3
Clock Controller
Backup
Clock
Controller 1
J1
J2
J3
553-7401