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Alarm indication signal

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Alarm indication signal (AIS) is a signal transmitted by a system that is part of a telecommunications link to let the receiver know that the link is logically, but not physically, dead.

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 path (AIS-P)
  • Alarm indication signal line (AIS-L)

A link indicating this state is often said to have "gone AIS".

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