Nortel DMS-100 Series Maintenance Manual page 116

2-40 Functional overview
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Figure 14 Overload protection system variable thresholds
Changes to the real-time subsystem
The real-time subsystem changes memory block system parameters. The
subsystem changes these parameters to keep the memory block limits ahead of
the real-time limits.
297-8361-550 Standard 04.02 December 2004
raw data that can detect real-time overload. The component leaves the raw
data in a depository for the data analysis component. The priority of this
component matches the priority of the segment of the system in which the
component resides.
The real-time data analysis component. This component analyzes the data
in the depository. The real-time data analysis component produces an
easy-to-read processor occupancy state. This state is not a percentage.
This state is a distress rating. This component does not use percentages
because percentages are too difficult to work on when real-time is scarce.
Percentages do not supply all of the information the control component
needs. The control component uses the distress rating. The distress rating
is reported to the CM when the XLCM reports overload. In addition, the
data analysis component provides indication of activity and the running of
the the data analysis component. This component runs at a high priority.
The real-time overload control component. This component monitors the
distress rating that the data analysis component outputs. When the output
indicates real-time overload, the control component adjusts parameters in
the Overload Protection System. The control component recovers some
real-time. The control component keeps the memory block limits ahead of
the real-time limits of the XLCM. These limits appear in the figure below.
When the data does not indicate trouble, the control component begins to
restore the Overload Protection System parameters. The Overload
Protection System parameters allow maximum call processing. This
component runs at a very high priority.
Updates to mate unit stopped
XPM delays processing originations
100 Available SMBs
48 Available LMBs
Total small and large memory blocks avaliable
No external messages received
BIC scanning stopped
45 40
20 15
25 normal
10 SMBs
15 SMBs
20 SMBs
35 25 0
10 0