2-20
Cisco ONS 15310-MA SDH Troubleshooting Guide, Release 9.0
78-18663-01
Chapter 2 Alarm Troubleshooting
Alarm Procedures
Generally, an 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 resolve 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 “LOS (STM)”
alarm on page 2-98, 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.
Step 3 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC
(1-800-553-2447).
2.7.2 MS-AIS
Default Severity: Not Reported (NR), Non-Service-Affecting (NSA)
Logical Objects: E3, STM
The AIS Line condition indicates that this node is detecting line-level AIS in the incoming signal. This
alarm is secondary to another alarm occurring simultaneously in an upstream node.
This condition can also be raised in conjunction with the “RS-TIM” alarm on page 2-138 if MS-AIS is
enabled.
Clear the MS-AIS Condition
Step 1 Complete the “Clear the AIS Condition” procedure on page 2-20.
Step 2 If the condition does not clear, log into the Technical Support Website at
http://www.cisco.com/cisco/web/support/index.html for more information or call Cisco TAC
(1-800-553-2447).
2.7.3 AU-AIS
Default Severity: Not Reported (NR), Non-Service-Affecting (NSA)
Logical Objects: VCMON-HP, VCTRM-HP
The AIS Path condition means that this node is detecting AIS in the incoming path. This alarm is
secondary to another alarm occurring simultaneously in an upstream node.
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