Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Compelled signalin

Compelled signaling refers to signaling where receipt of each signal from an originating register needs to be explicitly acknowledged before the next signal is able to be sent.

Most forms of R2 register signaling are compelled (see R2 signaling), while R1 multi-frequency signaling is not.

The term is only relevant in the case of signaling systems that use discrete signals (e.g. a combination of tones to denote one digit), as opposed to signaling systems which are message-oriented (such as SS7 and ISDN Q.931) where each message is able to convey multiple items of information (e.g. multiple digits of the called telephone number).

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