Nortel Networks Circuit Card - Manual (Page 354)

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