Northern Telecom DMS-100 Series Maintenance Manual page 41

Maintenance overview 1-23
Connection accuracy
Connection accuracy monitors the accuracy byte of the CSM.
System-scheduled OOS tests
The system periodically performs system-scheduled OOS tests on OOS
message links.
Network audit
On a 10-min cycle, the audit mechanism tests all InSv P-side message links
and the network accuracy buffer.
Fault recognition, network audits, and error counters are additional
automatic maintenance capabilities.
Fault recognition
When the system recognizes a fault, the system attempts to return the
network that has faults to service. The system performs the loopback
message and P-side processor communication tests. If the network passes
these tests during the 10-min auditing cycle, the network is RTS. If the test
fails, the system performs the complete OOS test. If the complete test fails,
another attempt to RTS occurs during the 10-min audit cycle. The network
SysB counter records the number of times that the test fails during the
10-min auditing cycle. This counter increases when the system sets the
network to the SysB state. The auditing cycle resets this counter to 0 every
10 min, or when the command RTS passes. If the counter increment reaches
a threshold value of 3, the system generates log NETM128. This log
identifies the network that has faults.
Network audit
The auditing cycle checks the network clock control register and the PM for
normal values. The auditing cycle also participates in the fault detection
process. Network performance counters record a number of events on the
C- and P-sides of each NM. The audit reads the counts every second day for
each network. The audit prints the counts to the network logs. The audit
also resets all counters to 0. The number of accuracy and parity errors
appear for each plane of each pair. The log system generates a daily
summary of this information every day at 8:00 a.m. in the form of a NET103
report.
Net log messages
The network SysB counter records the number of times that the test fails
during the 10-min auditing cycle. This counter increases when the network
changes to SysB state and the auditing cycle resets the counter to 0 every
10 min. The counter also increases when you enter the command RTS.
DMS-100 Family Networks Maintenance Guide BASE10