Signalling

Signalling (telecommunications)
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In telecommunication, signalling (UK spelling) or signaling (US spelling) has the following meanings:
The use of signals for controlling communications.
In a telecommunications network, the information exchange concerning the establishment and control of a connection and the management of the network, in contrast to user information transfer.
The sending of a signal from the transmitting end of a circuit to inform a user at the receiving end that a message is to be sent.
Signalling systems can be classified according to their principal properties, some of which are described below:
Contents[hide]
1 In-Band versus Out-Of-Band
2 Line versus Register
3 Channel-Associated versus Common-Channel
4 Compelled Signalling
5 Subscriber versus trunk signalling
6 Classification examples
7 Sources
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