MTP1 – Message Transfer Part Level 1
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MTP1 – Message Transfer Part Level 1

Message Transfer Part Level 1 resides at Layer 1 of the OSI (Open Systems Interconnect) model. It is a 64Kbps channel which has been allocated for signalling purposes. This channel is referred to as a SL (Signalling Link). It is possible for multiple links to be utilized this leads to the expression SLS (Signalling Link Set).

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