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Line 1: {{redirect\|AIS-P\|the data packet protocol\|Automatic Independent Surveillance-Privacy}} '''Alarm indication signal''' ('''AIS''') is a signal transmitted by a system that is part of a [[concatenated [[telecommunications system]] to let the receiver know that some remote part of the end-to-end link has failed at a logical or physical level, even if the system it is directly connected to is still working. Other systems attached to a system transmitting AIS then relay the AIS indication onwards to other systems. There are a number of types of AIS signals, which signal failure of different logical or physical segments of the system, including:

Alarm indication signal: Difference between revisions