General telecom

General telecom

Terms relating to telecommunication or communication through technological means.

Industry: Telecommunications

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General telecom

alarm indication signal (AIS)

Telecommunications; General telecom

A signal transmitted in lieu of the normal signal to maintain transmission continuity and to indicate to the receiving equipment that there is a transmission interruption located either at the ...

A signal transmitted in the outgoing direction when a terminal determines that it has lost the incoming signal. RAI is commonly called the yellow alarm signal. For superframe (SF) operation, an RAI ...

remote failure indication (RFI)

Telecommunications; General telecom

A signal transmitted in the outgoing direction when a terminal determines that specific defects have persisted long enough to declare a received signal failure. The RFI terminology is used with SONET ...

backward indicator bit (BIB)

Telecommunications; General telecom

A signal unit (or sequence of bits) that (by changing its status) is used to request retransmission by the remote end whenever it receives a signal unit that is out of sequence.

message signal unit (MSU)

Telecommunications; General telecom

A signal unit that contains service information and signaling information fields and is retransmitted by the signaling link control if it is received in error. The value of length indicator is always ...

link status signal unit

Telecommunications; General telecom

A signal unit that contains status information about the signaling link in which it is transmitted.

fill-in signal unit (FISU)

Telecommunications; General telecom

A signal unit that is transmitted when there are no message signal units or link status signal units to be transmitted. It contains only error control and delimitation information.