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).


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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