Alarm indication signal: Difference between revisions

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{{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.