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The system always defaults to the internal 32-MHz reference signal on power-up, reset or when attempts to synchronize to incoming or external sources have failed. Error and status messages are generated by system software as the synchronization process moves through its tasks.
Figure B-1 shows the basic sequence of tasks performed for T1/PRI synchronization to internal, incoming and external references. Administrators will find the flowchart to be helpful when trying to isolate problems caused when T1/PRI synchronization is not achieved.
The chart includes indications as to which error or status messages are output as tasks are being executed. Cross-reference is made to the message in the form "FRM xxx, yyy, zzz..." where xxx, yyy, zzz etc. refer to the number assigned to each FRM message. Definitions for each FRM message can be found in Cisco VCO/4K System Messages.
Posted: Sat Sep 28 15:07:13 PDT 2002
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