TDM-CLK (TDM Bus Clock)
Issue 1 May 2002
8-1131555-233-142
TDM bus Clock PPM Inquiry Test (#150)
This test evaluates the quality of the synchronization source for the Tone-Clock
circuit pack.
Table 8-483. Test #150 TDM bus Clock PPM Inquiry Test
Error
Code
Tes t
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 test was not executed because the IPSI circuit pack was using its local
oscillator rather than synchronizing to an external source.
1. Verify that this IPSI 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 up to 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 IPSI 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, see ‘‘Troubleshooting Approach’’ in the ‘‘SYNC (Port-Network
Synchronization)’’ section of this manual.
PASS The IPSI 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 an IPSI circuit pack. Use the status
synchronization command to verify that the desired synchronization reference
is providing timing for the system.
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