Maintenance Object Repair Procedures
555-233-123
10-1148 Issue 4 May 2002
System Technician-Demanded Tests: Descriptions
and Error Codes
Always investigate tests in the order presented in the following tables when
inspecting errors in the system. By clearing error codes associated with the Digital
Port Sanity Test, for example, you may also clear errors generated from other
tests in the testing sequence.
NPE Crosstalk Test (#9)
This test is a modified version of the Digital Line NPE Crosstalk Test used by
DIG-LINE maintenance.
One or more NPE reside on each circuit pack with a TDM Bus interface. The NPE
controls port connectivity, 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/or noisy
connections may be observed. This test is part of a port’s long test sequence and
takes approximately 10 to 20 seconds to complete. This test is a modified version
of the Digital Line NPE Crosstalk Test used by DIG-LINE maintenance.
Order of Investigation
Short Test
Sequence
Long Test
Sequence D/ND
1
1 D = Destructive; ND = Nondestructive
Digital Port Sanity Test (#565) X X ND
Digital Port Loop Around Test (#13) X X ND
NPE Crosstalk Test (#9) X ND
Hook State Inquiry (#566) X X ND
Clear Error Counters (#270) X ND
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