Alarm indication signal: Difference between revisions

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Revision as of 04:13, 16 December 2009

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'''Alarm indication signal''' ('''AIS''') is a signal transmitted by an intermediate element of a multi-node transport circuit that is part of a concatenated [[telecommunications system]] to alert the receiving end of the circuit that a segment 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. The AIS replaces the failed data, allowing the higher order system in the concatenation to maintain its transmission framing integrity. Downstream intermediate elements of the transport circuit propagate the AIS onwards to the destination element.

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As the use of [[Ethernet]] for long-distance data links has increased, the need for a similar end-to-end [[OA&M]] function has led to the development of a similar Ethernet alarm indication signal ([[EthAIS]]).

== See also ==

* [[Concatenation (telecommunications)]]

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