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alarm indication signal (AIS)

The Alarm Indication Signal (AIS) is a monitoring signal in the Synchronous Digital Hierarchy (SDH), on T1 lines or in B-ISDN

and also in OSI network management. Whenever a transmission error - a loss of signal or packet - is detected in the transmission channel, or an error message is received from another unit in the transmission path, the unit transmits the AIS signal downstream or upstream, indicating the error message. The alarm indication signal ensures that the operation of the downstream regenerator is maintained, thus providing unnecessary alarms.

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Englisch: alarm indication signal - AIS
Updated at: 28.01.2015
#Words: 62