TDM-BUS (TDM Bus)
Issue 4 May 2002
10-1709 555-233-123
System Technician-Demanded Tests: Descriptions
and Error Codes
Always investigate tests in the order presented in the table below when inspecting
errors in the system. By clearing error codes associated with the Control Channel
Test, for example, you may also clear errors generated from other tests in the
testing sequence.
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 pack 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 all the time slots have 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 are taken out-of-service on one
bus, and no more than 300 are taken out-of-service on both buses at one time.
Order of Investigation
Short Test
Sequence
Long Test
Sequence D/ND
1
1 D = Destructive; ND = Nondestructive
Control Channel Test on the Control
Channel Bus (#296) X X ND
Digit Detection Test on the Non-Control
Channel Bus (#297) X X ND
Idle Time Slot Test on TDM Bus A (#294) X X ND
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