The General-purpose Port (GPP) Network Processing Element (NPE) Crosstalk Test verifies that the port’s NPE channel talks on the selected time slot and that it never crosses over to time slots reserved for other connections. 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. An NPE that is not working correctly may cause one-way and noisy connections. This test takes about 20 to 30 seconds to run.
Crosstalk testing is performed on both the primary (for voice) and the secondary (for data) information channel associated with each port. If this test fails on either channel, the port is taken out of service.
This test is run on the following maintenance objects:
