AIS
Default Severity: Major
Logical Object: CLIENT
AIS
The Alarm Indication Signal (AIS) condition indicates that this node is detecting an alarm indication signal in the incoming signal SONET overhead. Generally, any AIS is a special SONET 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 it detects 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.
AIS-L
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 TIM-S alarm if AIS-L is enabled.
MS-AIS
The Multiplex Section (MS) AIS condition indicates that there is a defect in the multiplexing section layer of the SONET overhead. The multiplex section refers to the segment between two SONET devices in the circuit and is also known as a maintenance span. The multiplex section layer of the SONET overhead deals with payload transport, and its functions include multiplexing and synchronization.
Clear the AIS-L Alarm
Procedure
Step 1 |
Verify that the remote configuration is correct. |
Step 2 |
Check the line status at the remote end of the link. If the alarm does not clear, log in to the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447). |