Load File Mismatch; Automatic Maintenance - Nortel DMS-100 Series Maintenance Manual

1-44 Maintenance overview
Monitoring occurs through operational measurements (OM). The OMs
indicate when maintenance or out-of-service thresholds exceed the limit.
The host controller maintains and tests the DS-1 links, generates alarms for
link faults, and assigns different channels when faults occur on these links.
Operating company personnel can obtain the bipolar violation (BpV) count
at the RLCM through the following actions. Operating company personnel
can post the host XPM with the REMOTE parameter at the carrier level of
the MAP display or by post the host XPM. The personnel also can issue the
DETAIL command with the REMOTE parameter. The BpVs are not severe
enough to raise an alarm, but can signal wear of a DS1 link.
The signals on a DS-1 link travel in two directions and the host controller or
the RLCM can detect faults like BpVs. The RLCM notifies the host
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controller when the BpV count exceeds the threshold of 1 BpV per 10 bits.
The RLCM also monitors the loss of frame indicator for the DS-1 links. The
RLCM turns on an outgoing alarm for a frame loss of more than 2.5s. The
system removes the outgoing alarm when the frame is restored for 10s.
If the RLCM detects loss of the framing pattern for 2.5s or more, or if the
host XPM detects loss of the framing pattern for 220ms, frame loss at the
out-of-service limit occurs. A local carrier group alarm (LCGA) occurs at
the carrier level of the MAP display if the host XPM detects loss of frame. A
remote carrier group alarm (RCGA) appears if the RLCM detects the loss of
frame. For information on standard troubleshooting procedures to clear
these faults, refer to the chapter Troubleshooting chart.
DS30A links
The DS30A links on the P-side of the RLCM can fail. These links connect
to an RMM or ESA module. Faults on these links can affect the associated
modules.

Load file mismatch

A load file mismatch fault condition is present when a load in the LCM does
not match the load specified in table LCMINV.

Automatic maintenance

The DMS-100 Family switch of peripheral modules (PM) must be reliable
for different fault conditions. The PMs contain several hardware
redundancies that serve as backup operations for module, card, and link
failures. Fault conditions that do not require interruption can be present.
When fault conditions occur, the host switch and the RLCM initiate audits or
other system actions. The audits and system action attempt to locate and
correct the fault.
297–8351–550 Standard 04.01 August 1999