MS_AIS Procedure
Description
The MS_AIS alarm indicates a multiplex section alarm, triggered when bits 6 to 8 of the
K2 byte in three consecutive frames are "111".
Impact on the System
Services on the line port are interrupted. If configured with protection, protection
switching is activated.
Possible Causes
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The transmit unit of the peer site is malfunctioning.
The receive unit of the local site is malfunctioning.
Procedure
Cause 1: The transmit unit of the peer site is faulty.
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Replace the faulty board at the peer site, depending on the type of alarmreporting board:
• If the line board reports the alarm, replace the line unit board at the peer end.
• If the IF board reports the alarm, replace the IF board at the peer site.
• After replacement, verify if the alarm is cleared.
If the alarm clears, conclude alarm handling.
If the alarm persists, proceed to the next step.
• Replace the system control, switching, and timing board at the peer site if the
alarm persists after the initial replacement.
• After replacement, recheck for alarm clearance.
If the alarm clears, conclude alarm handling.
If the alarm persists, proceed to cause 2.
Cause 2: The receive unit of the local site is faulty.
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Replace the board reporting the alarm at the local site.