Overload Resources; Escalation To Manual Maintenance - Nortel DMS 100 Series Maintenance Manual

2-66 Maintenance overview
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Overload resources

The traffic load on the RSC-M can be an amount of call processing greater than
the processor cards can handle. As a result, the RSC-M accepts calls at a
slower rate until the overload clears. Normally, in processing calls, the RSC-M
queues the call requests and assigns the requests priorities in the data store.
When the data store fills close to capacity, the RSC-M overload controls slow
the rate of load acceptance. The controls halt the call process until store is
available.
Overload control in the RSC-M occurs for C-side communication and line
scanning.
In slowing or stopping the P-side communication, the RSC-M processor cards
decrease the rate that the cards scan for messages on the P-side. By slowing
the incoming workload, the demand for data store decreases. When the buffers
are full, the system does not accept any work. The results are partial dials or
ignored keys on business sets.
Display of overload state
When the RSC-M becomes overloaded, the state display changes to ISTb
while both units show INSV.
Overload indicators (PM128, QUERYPM)
overload, the system produces a PM128 log (RSC-M is ISTb). The log
contains the following message:
PM Overloaded
At the PM level of the MAP display, posting the RSC-M and entering the
QUERYPM FLT command provides the same message.
When this condition occurs, operating company personnel must immediately
begin to collect all important OMs that track the amount and types of traffic.
The reason the RSC-M enters overload can relate to a maintenance area, like
network faults. In some occurrences, the reasons can relate to a capacity
capability of the RSC-M configuration. The OM reports must be forwarded to
both maintenance and engineering personnel for analysis.

Escalation to manual maintenance

With the RSC-M, automatic maintenance includes the output of the correct
trouble indicators. The information that is normally in this section is in the
"Automatic maintenance" section of this maintenance guide.
297-8223-550 Standard 04.02 November 2000
audits of the IML links
parity errors in the RSC-M
When the RSC-M enters