Checksums; Overload Resources - Nortel DMS-100 Series Maintenance Manual

Checksums

For the DMS-100 Family of PMs, a number calculates the checksum
(CHKSUM) for each software load. After you load and test the PM, the
system compares the checksum total with the expected checksum total. If
the totals match, the load is correct.
If a mismatch is present, use the LOADPM command to load the PM again.
Each PM type has a different checksum value for each load. The command
QUERYPM displays a checksum value for the load of the PM.

Overload resources

When the OPAC processes calls, the OPAC queues call requests. The OPAC
assigns priorities to the call requests in the OPAC data store. The OPAC
overload controls react as the data store fills close to capacity. The OPAC
overload controls slow the rate of load acceptance or halt the call process
until store is available.
The amount of call processing can be greater than the LCM processor cards
can handle. In this event, the OPAC accepts calls at a slower rate until the
overload clears.
Overload control in the OPAC occurs for C-side communication and line
scanning.
When LCM processor cards slow or stop C-side communication, LCM
processor cards scan for messages on the C-side at a decreased rate. The
need for data store decreases when LCM processor cards slow the incoming
work load. The LCM processor cards slow MAP terminal queries of OPAC
status and C-side responses to OPAC-supported terminals.
During overload, the LCM processor cards do not scan the BIC until enough
data store is available. When LCM processor cards do not scan the BIC,
LCM processor cards prevent incoming work from the P-side. The LCM
processor cards queue incoming work in the output buffers of the BIC.
When the buffers are full and the system does not accept more work, partial
dials or ignored keys on business sets result.
Display of overload state
When the OPAC overloads, the LCM status display of the OPAC changes to
ISTb while both units show INSV. When you enter the command string
QUERYPM FLT at the LCM level, the response
with the response.
DMS-100 Family OPAC Maintenance Manual XPM12 and up
Maintenance overview 1-37
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LCM Overloaded