Chapter 1 An Introduction to Signalling 1.1 Signalling - General In a telephony context, signalling means the passing of information and instructions from one point to another relevant to the setting up and supervision of a telephone call. By tradition, Signalling has been divided into two types :Subscriber Signalling i.e. signalling between a subscriber terminal (telephone) and the local exchange, and Trunk Signalling i.e. signalling between exchanges. See Figure 1.1. ! Local Exchange Local Exchange Trunk Signalling Subscriber Signalling Subscriber Signalling ! c c s c a s c c s c a s Fig.1-1 Traditional division of signalling The Trunk Signalling has further been divided into :Channel Associated Signalling (CAS) i.e. signalling in the speech channel (in-band) or in a channel closely associated with the speech channel ,and Common Channel Signalling (CCS) i.e. signalling in a channel totally separated from the speech channels and where this Signalling Channel is common for a large number of speech channels. OIC0003 No.7 System Overview 1
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