Reference clock errors, Primary reference secondary reference – Nortel Networks Circuit Card User Manual

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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

Clock Controller
Backup

Clock
Controller 0

Clock
Controller 1

Primary

Secondary

REF 1

REF 2

REF 1

REF 2

Secondary
clocking
source