Nortel Passport 7400, Установка оборудования, техническое обслуживание и устранение неисправностей, Страница: 77 / 438

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Passport 7400 Hardware Installation, Maintenance, and Upgrade 5.2S1
Chapter 11
BITS termination panel replacement
Replace a BITS termination panel if it fails to maintain external timing
capability.
• “Prerequisites to BITS termination panel replacement” (page 77)
• “BITS termination panel replacement task flow” (page 77)
Prerequisites to BITS termination panel replacement
• Some of the procedures in this task are not located in this NTP. Ensure
you have access to the required NTPs.
• A BITS termination panel is not modeled as a component and cannot be
locked. To have minimal impact on the system, all external timing
components must be locked before removing the BITS termination
panel. This is the first procedure in the task flow.
• If the primary and secondary source are provisioned with external timing
sources and the tertiary source is line timed, the system will switch to the
tertiary source once the BITS termination panel is removed. If there is no
tertiary source provisioned the system will go into holdover.
• Replacement of the BITS termination panel does not require a shelf reset.
Network synchronization will return to the BITS source automatically, if
it is provisioned as the reference source.
BITS termination panel replacement task flow
This task flow shows you the sequence of procedures you perform to replace
a BITS termination panel. To link to any procedure, go to “Task flow
navigation” (page 78).