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VCE
What are the common causes for pointer justification?
A. Clock sources or clock source levels are configured incorrectly. As a result, there are two clock sources on one network or a timing loop occurs. AU and TU pointers will adjust.
B. The power supply for the subrack is faulty, resulting in abnormal operation of clock boards. AU and TU pointers will adjust.
C. The cross-connect board is faulty, resulting in degraded clock quality. AU and TU pointers will adjust.
D. The tributary board is faulty, resulting in justification of both AU and TU pointers.
Generally, a clock tracing chain consists of a maximum of 20 NEs. This rule does not apply to a clock subnet where the SSM protocol is enabled.
A. TRUE
B. FALSE
The cross-connections that fail to work on the network layer and exist only on isolated NEs are called unused services.
A. TRUE
B. FALSE