Cisco ONS 15454 Troubleshooting Manual page 226

2.5.2 Condition Characteristics
2.5.2 Condition Characteristics
Conditions include any problem detected on an ONS 15454 shelf. They can include standing or transient
notifications. A snapshot of all current raised, standing conditions on the network, node, or card can be
retrieved in the CTC Conditions window or using TL1's set of RTRV-COND commands. (In addition,
some but not all cleared conditions are also found in the History tab.)
For a comprehensive list of all conditions, refer to the Cisco ONS SONET TL1 Command Guide . For
more information about transient conditions, see
When an entity is put in the OOS,MT administrative state, the ONS 15454 suppresses all standing alarms
Note
on that entity and alarms and events appear on the Conditions tab. You can change this behavior for the
LPBKFACILITY and LPBKTERMINAL alarms. To display these alarms on the Alarms tab, set the
NODE.general.ReportLoopbackConditionsOnOOS-MTPorts value to TRUE on the NE Defaults tab. For
more information about changing NE defaults, refer to the "Maintain the Node" chapter in the
Cisco ONS 15454 Procedure Guide.
2.5.3 Severities
The ONS 15454 uses Telcordia-devised standard severities for alarms and conditions: Critical (CR),
Major (MJ), Minor (MN), Not Alarmed (NA) and Not Reported (NR). These are described below:
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Severities can be customized for an entire network or for single nodes, from the network level down to
the port level by changing or downloading customized alarm profiles. These custom severities are
subject to the standard severity-demoting rules given in Telcordia GR-474-CORE and shown in the
"2.5.4 Alarm Hierarchy" section on page
in the "Manage Alarms" chapter in the Cisco ONS 15454 Procedure Guide.
Cisco ONS 15454 Troubleshooting Guide, R8.5
2-32
A Critical (CR) alarm generally indicates severe, Service-Affecting (SA) trouble that needs
immediate correction. Loss of traffic on an STS-1, which can hold 28 DS-1 circuits, would be a
Critical (CR), Service-Affecting (SA) alarm.
A Major (MJ) alarm is a serious alarm, but the trouble has less impact on the network. For example,
loss of traffic on more than five DS-1 circuits is Critical (CR), but loss of traffic on one to four DS-1
circuits is Major (MJ).
Minor (MN) alarms generally are those that do not affect service. For example, the automatic
protection switching (APS) byte failure (APSB) alarm indicates that line terminating equipment
(LTE) detects a byte failure on the signal that could prevent traffic from properly executing a traffic
switch.
Not Alarmed (NA) conditions are information indicators, such as for free-run synchronization state
(FRNGSYNC) or a forced-switch to primary (FRCSWTOPRI) timing event. They could or could
not require troubleshooting, as indicated in the entries.
Not Reported (NR) conditions occur as a secondary result of another event. For example, the alarm
indication signal (AIS), with severity NR, is inserted by a downstream node when an LOS (CR or
MJ) alarm occurs upstream. These conditions do not in themselves require troubleshooting, but are
to be expected in the presence of primary alarms.
Chapter 3, "Transient Conditions."
2-33. Procedures for customizing alarm severities are located
Chapter 2 Alarm Troubleshooting
November 2009