Inter-exchange signaling

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The interoffice signaling in the telecommunication , the signaling between switching centers whose main purpose is to dial- up and take down. The Signaling System Number 7 is now used internationally in the ISDN , GSM and UMTS networks . The performance features of the intelligent network are also based on it. In Germany it replaced the previously used impulse identification method (IKZ) which, like the signaling protocols Signaling System Number 5, Number 4 and R2, only had national significance. Signaling channels (also referred to as central signaling channels ZZK, English Common Channel Signaling , CCS) are used for inter- exchange signaling , which form an independent network (ZZK network) that is separate from the network of user channels. The signaling channels are based on fixed 64 kbit / s channels that are operated point-to-point. In Germany they form a meshed network with three hierarchical levels. This network has end points in the exchanges, which are referred to as signaling points (SP). Edit these endpoints signaling by appropriate settings of the switching matrices make in the exchanges. Another type of network node only performs transport-oriented functions and is therefore referred to as a signaling transfer point (STP). It routes incoming signaling messages on towards the target SP. STPs are also usually part of an exchange.

literature

  • Peter Bocker: ISDN - the integrated services digital message network. Third edition, Springer Verlag, Berlin / Heidelberg, ISBN 978-3-662-08031-3 .

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