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Chapter 1: Introduction to the EIU 43
DMS-100 Family EIU User Guide TELECOM12
Logs, alarms, and OMs
In general, the subsystems that generate logs, alarms, and OMs do not have
significant changes apart from the standard DMS-100 reporting sub-systems.
Log reports
All logs from the EIU conform to the DMS OAM infrastructure. Log messages
are formatted in the DMS-core for display using the standard DMS log system.
Alarms
The EIU uses the DMS alarm system to report faults. Alarms are raised by
major maintenance state changes (usually brought on by hardware problems or
overload conditions). In addition, the MAP interface displays a composite
alarm banner across the top of the screen. This banner displays alarms with the
most urgent priority; as maintenance personnel clear the highest priority
alarms, next in priority display for each subsystem. In a healthy DMS-100
switch (that is, operations are normal), there are few alarms occurring.
Operational measurements
The EIU uses the DMS OM collection system to collect and distribute
operational measurements. The DMS OM subsystem also generates simple
reports. OMs can be transferred to “down-stream” processors for more
detailed analysis.
In general, operational measurements can be used to determine performance
and capacity in operational components. General types of operational
measurements gathered by the switch include the following:
• error counts
• I/O counts (operations completed)
• CPU occupancy
CAUTION
Possible loss of information
If a telnet session drops, logs and OMs may be lost.