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Control signal : ウィキペディア英語版
Signaling (telecommunications)

In telecommunication, signaling (signalling in British English) has the following meanings:
*the use of signals for controlling communications
*the information exchange concerning the establishment and control of a telecommunication circuit and the management of the network, in contrast to user information transfer
*the sending of a signal from the transmitting end of a telecommunication circuit to inform a user at the receiving end that a message is to be sent.
Signaling systems may be classified based on several principal characteristics.
==In-band and out-of-band signaling==

In the public switched telephone network (PSTN), in-band signaling is the exchange of call control information within the same channel that the telephone call itself is using. An example is dual-tone multi-frequency signaling (DTMF), which is used on most telephone lines to customer premises.
Out-of-band signaling is telecommunication signaling on a dedicated channel separate from that used for the telephone call. Out-of-band signaling has been used since Signaling System No. 6 (SS6) was introduced in the 1970s, and also in Signalling System No. 7 (SS7) in 1980 which became the standard for signaling among exchanges ever since.〔(【引用サイトリンク】title=Signaling in/out-of-band Definition )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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