Nortel DMS-100 Series Maintenance Manual page 58

1-42 Maintenance overview
Enhancements to the overload protection system
In addition to current functions, the enhanced XLCM overload protection
system performs the following actions:
Take protective measures to keep XLCM sanity. To retain XLCM call
processing capacity, these protective measures are active for the minimum
amount of time required.
This enhancement adds three new components to the current overload
protection system.
297-8211-550 Standard 05.01 August 1999
detects when the XLCM is in real-time overload
reports overload to the CM
The processor occupancy data collection component is distributed over
key areas of the XLCM code. This component collects raw data that can
help detect real-time overload. This component leaves raw data in a
depository for the data analysis component. The priority of this
component matches the priority of the segment of the system where the
component resides.
The real-time data analysis component analyzes the data in the
depository. This component produces an processor occupancy status that
is easy to read. This status is a distress rating and not a percentage. The
system does not use percentages. Percentages are to use when real-time
is a small amount. Percentages do not supply all information that the
control component needs. The control component uses the distress
rating. The system reports the distress rating to the CM when the XLCM
reports overload. The data analysis component indicates if the data
analysis component runs normally. The data analysis component runs at
a high priority.
The real-time overload control component uses the distress rating output
of the data analysis component. If the output indicates real-time
overload, the control component adjusts parameters in the overload
protection system. This action recovers some real-time and keeps the
limits of memory block ahead of XLCM real-time limits. The following
tables shows this action. If the data does not indicate trouble, the
following action occurs. The control component begins to restore the
overload protection system parameters to allow maximum call
processing. This component runs at a very high priority.