Defective Ringing Generator (Rg) Frequency Generator Circuit; Load File Mismatch; Diagnostic Tests; Bit Error Rate Performance Tests - Nortel DMS-100 Series Maintenance Manual

Defective ringing generator (RG) frequency generator circuit

To handle a defective RG frequency generator circuit:
1 Test the RG.
2 If the test fails, replace the RG.

Load file mismatch

To handle a load file mismatch:
1 Post the RLCM.
2 Use the QUERYPM command to display the PM load in the RLCM.
3 Determine the correct RLCM PM load.
4 Correct Table LCMINV if the table does not have the correct PM load
5 If the table does not have a correct PM load for the RLCM, obtain the

Diagnostic tests

Bit error rate performance tests

Bit error rate performance (BERP) tests test transmission paths through the
network. These tests provide the operating company with a tool to assess
the bit error performance of the Digital Multiplex System-100 (DMS-100)
switch. The operating company can assess the subtending nodes of the
DMS–100 with BERP tests. Feature package NTX881AB includes BERP
tests. The BERP tests require the NT6X99AA IBERT line card available in
the LCM of the RLCM.
The BERP test consists of many bit error rate tests (BERT). To perform a
BERT, operating company personnel perform the following:
The bit pattern is reflected back to the IBERT and is compared to the
original bit pattern. Any errors in the returned bit stream are recorded. The
results of each BERT comprises the result of the BERP test.
Access the BERP test from the maintenance (MTC) level of the MAP
terminal. The BERP level commands can set up tests for a continuous basis
or for a set duration.
for the RLCM.
correct PM load. Reload the RLCM.
connect an integrated bit error rate tester (IBERT) to another part of that
IBERT, or to a specified endpoint like a data line card (DLC)
transmit a known bit pattern
DMS-100 Family RLCM Maintenance Manual XPM12 and up
Trouble isolation and correction 10-5