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TDM-CLK (TDM Bus Clock)
Issue 5 October 2002
1675
555-233-119
TDM Bus Clock PPM Inquiry Test (#150)
This test evaluates the quality of the synchronization source for the Tone-Clock
circuit pack
Table 492. TEST #150 TDM Bus Clock PPM Inquiry Test
Error
Code Test
Result Description/ Recommendation
ABORT The system could not allocate the necessary resources for the test.
1001 ABORT The system could not allocate the necessary resources for the test.
1. Wait 1 minute, and retry the test.
255 ABORT The Tone-Clock circuit pack was using its local oscillator rather than
synchronizing to an external source.
1. Verify that this Tone-Clock circuit pack is expected to be the
synchronization source. If not, correct the synchronization information
and re-execute the test.
2000 ABORT Response to the test request was not received within the allowable time
period.
2100 ABORT System resources required to run this test are not available.
1. Retry the command at 1-minute intervals a maximum of 5 times.
Any FAIL The error code represents the rate (in Parts Per Million, or PPM) at which
clock slip errors have been detected on the incoming synchronization source
since the last PPM inquiry was sent to the Tone-Clock circuit pack. A failure
of this test indicates that we are outside of Stratum 4 timing specifications on
the incoming timing source.
The error code is a variable amount ranging from 1 to 254.
1. If error 1537 is entered in the hardware error log against TDM-CLK, then
the board has switched timing sources. Follow the procedures
associated with hardware log error code 1537.
2. Otherwise, refer to "Approach to Troubleshooting" in the
Synchronization (SYNC) Maintenance section of this manual.
PASS The Tone-Clock circuit pack does not detect timing any PPM errors. This
indicates that the external synchronization timing source is valid or that the
system synchronization reference is a Tone-Clock circuit pack. The status
synchronization command should be used to verify that the desired
synchronization reference is providing timing for the system.
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