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R2 signalling
R2〔(ITU-T Recommendation Q.400-Q.490 ) - Specifications of Signalling System R2〕 is a 1950s- and 1970s-era channel-associated-signalling signalling protocol used outside of the former Bell System to convey information along a telephone trunk between two telephone switches in order to establish a single telephone call along that trunk.
R2 is the name given to two broad protocol groups: R2 line signalling and R2 register signalling.
== Information conveyed along an R2-signalled trunk ==
A signalling protocol is best visualized by two contexts: what information it conveys and where its participants are in the network. This section presents those two contexts.
Each national variant in the family of R2 signalling protocols conveys at least the following, where ''forward'' is the direction from the dialling telephone's switch to the called telephone's switch and where ''backward'' is the direction from the called telephone's switch to the calling telephone's switch:
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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