Maintenance Object Repair Procedures
555-233-123
10-890 Issue 4 May 2002
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 Local Digital
Loop Around Test, for example, you may also clear errors generated from other
tests in the testing sequence.
NPE Crosstalk Test (#6)
One or more NPEs reside on each circuit pack with a TDM Bus interface. The
NPE controls port connectivity and gain, and provides conferencing functions on a
per port basis. The NPE Crosstalk Test verifies that this port’s NPE channel talks
on the selected time slot and never crosses over to time slots reserved for other
connections. If the NPE is not working correctly, one-way and noisy connections
may be observed. This test is part of a port’s Long Test Sequence and takes
about 20 to 30 seconds to complete.
Table 10-323. System Technician-Demanded Tests: HYB-LINE
Order of Investigation
Short Test
Sequence
Long Test
Sequence D/ND
1
1 D = Destructive, ND = Non-destructive
Local Digital Loop Around Test (#58) X ND
NPE Crosstalk Test (#6) X ND
Hybrid Electronic Power Feed Test (#56) X ND
Hybrid Circuit and Conference Circuit Test (#57) X ND
Remote Digital Loop Around Test (#59) X X ND
Station Lamp Update Test (#60) X X ND
Station Audits Test (#61) X X ND
Ringer Update Test (#62) X X ND
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