For the majority of maintenance objects, this test is known as the NPE Crosstalk Test (#6). One or more Network Processing Elements (NPEs) reside on each circuit pack with a TDM Bus interface. The NPE controls port connectivity and gain, and provides conference functions on a per-port basis. This test verifies that the NPE channel of the port 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 takes about 20 to 30 seconds to complete.
For MMI-BD, this test is known as the TSI Crosstalk Test (#6). The Time Slot Interchanger (TSI) chip controls connectivity to the TDM bus. The TSI Crosstalk test verifies that this TSI talks on the selected TDM bus time slot and never crosses over to time slots reserved for other connections. If the TSI is not working correctly, one-way and noisy connections may occur. If the test passes, the TSI can communicate over the TDM bus. This test takes approximately 20 to 30 seconds to complete.
For VC-SUMPT, this test is known as the VC-SUMPT Port NPE Crosstalk Test (#6). It is a slightly modified version of the NPE Crosstalk Test.
This test runs on the following maintenance objects:
