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Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 2 Alarm Troubleshooting
2.6 Alarm Procedures
Warning
Do not reach into a vacant slot or chassis while you install or remove a module or a fan. Exposed
circuitry could constitute an energy hazard.
Statement 206
Warning
The power supply circuitry for the equipment can constitute an energy hazard. Before you install or
replace the equipment, remove all jewelry (including rings, necklaces, and watches). Metal objects
can come into contact with exposed power supply wiring or circuitry inside the DSLAM equipment.
This could cause the metal objects to heat up and cause serious burns or weld the metal object to the
equipment.
Statement 207
2.6 Alarm Procedures
This section lists alarms alphabetically and includes some conditions commonly encountered when
troubleshooting alarms. The severities, descriptions, and troubleshooting procedures accompany alarms
and conditions.
Note
When an entity is put in the Out of Service and Maintenance (Locked,maintenance) administrative state,
the ONS 15600 SDH suppresses all standing alarms on that entity. All alarms and events appear on the
Conditions tab. You can change this behavior for the LPBKFACILITY, LPBKPAYLD, and
LPBKTERMINAL alarms. To display these alarms on the Alarms tab, set the
NODE.general.ReportLoopbackConditionsOnPortsInOOS-MT to TRUE on the NE Defaults tab.
2.6.1 AIS
Default Severity: Not Reported (NR), Non-Service-Affecting (NSA)
Logical Object: BITS
The Alarm Indication Signal (AIS) condition indicates that this node is detecting an alarm indication
signal in the incoming signal SDH overhead.
Generally, any AIS is a special SDH signal that communicates to the receiving node when the transmit
node does not send a valid signal. AIS is not considered an error. It is raised by the receiving node on
each input when the node sees the AIS instead of a real signal. In most cases when this condition is
raised, an upstream node is raising an alarm to indicate a signal failure; all nodes downstream from it
only raise some type of AIS. This condition clears when you resolved the problem on the upstream node.
Clear the AIS Condition
Step 1
Determine whether there are alarms on the upstream nodes and equipment, especially the
or if there are out-of-service (Locked,maintenance or Locked,disabled)
ports.
Step 2
Clear the upstream alarms using the applicable procedures in this chapter.
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