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TDM-BUS (TDM Bus)
Issue 1 June 2005 2249
Idle Time Slot Test on TDM bus A or B (#294)
The Idle Time Slot test detects noisy time slots on the bus and takes them out-of-service. The
Tone Detector circuit is told to listen to idle time slots and if it detects any noise on a time slot, it
returns a failure. At the end of the test, any out-of-service time slots are retested to see if they
are still noisy and restored to service if they are idle. After every time slot has been tested,
maintenance counts the number of bad time slots and reports the number to the technician in
the Error Code field. No more than 220 time slots will be taken out-of-service on one bus and no
more than 300 will be taken out-of-service on both buses at one time.
Table 802: Test #294 Idle Time Slot Test on TDM bus A or TDM bus B
Error
Code
Test
Result
Description / Recommendation
None ABRT Could not allocate the necessary system resources to run this test. For
example, maintenance could be running on the Tone Detector circuit and it
is using the CPTRs.
1115 ABRT Could not allocate the necessary system resources to run this test.
1. Retry the command at 1-minute intervals up to 3 times.
Any FAIL The Error Code indicates the number of bad time slots that were detected.
The cause of this failure is most likely due to a bad port circuit pack and not
the TDM bus itself.
1. Execute the command again.
2. If the error persists, check the Error and Alarm Logs for alarms, on the
port network where the faulted TDM bus resides, on port circuit packs
from the NPE Crosstalk test. Also check for EXP-INTF alarms
associated with Error Type 1537.
3. Refer to the appropriate circuit pack’s documentation to clear the
circuit pack’s problem.
4. Test the TDM bus again. If the error continues, see TDM-Bus Fault
Detection and Isolation on page 2238.
PASS The success of this test indicates every idle time slot that is supposed to be
idle are indeed idle. There is no noise on any of the idle time slots.