Compelled Signaling
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).
Read more about this topic: Signaling (telecommunications)
Famous quotes containing the word compelled:
“The civilized nations—Greece, Rome, England—have been sustained by the primitive forests which anciently rotted where they stand. They survive as long as the soil is not exhausted. Alas for human culture! little is to be expected of a nation, when the vegetable mould is exhausted, and it is compelled to make manure of the bones of its fathers. There the poet sustains himself merely by his own superfluous fat, and the philosopher comes down on his marrow-bones.”
—Henry David Thoreau (1817–1862)