inc. VT AIS
....................................................................................................................................................................................................................................
inc. VT AIS
The system has detected a virtual tributary (VT) path alarm indication
signal (AIS) incoming from the active OC-N line. The system
responds by transmitting DS1 AIS toward the DSX-1 and VT RFI-V
back toward the fiber from which the AIS is being received.
Alarm Data
Value/Meaning
Reported Alarm
Level(s)
Major (MJ), Minor (MN), Not Alarmed
MJ is the SA default level.
MN is the NSA default level.
AID (type)
VT1.5 Ring Channel (Path)
Date
month/day/year that condition was detected
Time
hour:minute:second that condition was detected
Probable Cause
AIS
Effect on
Service
MJ = SA
MN = NSA
Not Alarmed = Standing Condition (SC)
Alarm Entity
Type
VT1
Description
inc. VT AIS
Likely Cause
Incomplete or incorrect cross-connection
provisioning in end-to-end network; unprotected
removal or failure of a DS1 circuit pack at the far
end.
In ring applications, a non-service affecting VT
AIS alarm message may result from an upstream
OC-N circuit pack or fiber failure affecting only
one ring direction. A VT RFI-V alarm message is
not returned for a non-service affecting VT AIS.
Visible
indication
Lighted
CR/MJ
or
MN/ABN
LED on SYSCTL
faceplate.
Action
Proceed to
Alarms, conditions, and error messages
....................................................................................................................................................................................................................................
365-372-333 R2.1
Issue 4, June 2005
Lucent Technologies
3 - 6 5
