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MTP is divided into three parts, located at levels 1, 2, and 3 of the SS7 hierarchy. The main functions of these parts are outlined below [l-5]. MTP Level 7 (MTp7) is the physical signaling data link (SDL), which consists of a pair of 64 kb/s digital transmission channels, and transports SS7 signal units between two signaling points. MTPl is described in Section . MTf Level 2 (MTf2). | Signaling in Telecommunication Networks. John G. van Bosse Copyright 1998 John Wiley Sons Inc. ISBNs 0-471-57377-9 Hardback 0-471-22415-4 Electronic SS7 MESSAGE TRANSFER PART The message transfer part MTP of SS7 has two main functions. In the first place it handles the transfer of MTP-user messages across the SS7 signaling network. In the second place it includes functions to keep the message traffic flowing when failures occur in the signaling network. INTRODUCTION TO MTP Structure of MTP MTP is divided into three parts located at levels 1 2 and 3 of the SS7 hierarchy. The main functions of these parts are outlined below 1-5 . MTP Level 1 MTP1 is the physical signaling data link SDL which consists of a pair of 64 kb s digital transmission channels and transports SS7 signal units between two signaling points. MTP1 is described in Section . MTP Level 2 MTP2 . A signaling link SL between signaling points A and B consists of a SDL between the signaling points and MTP2 functions located at both signaling points Fig. . The MTP2 functions are similar to the functions of the signaling terminals in signaling system see Section . They relate to individual signaling links and include synchronization and the detection and correction of errors in message signal units MSU . MTP2 is discussed in Sections through . MTP Level 3. MTP3 is the interface between MTP and the MTP-users level 4 protocols at a signaling point. In addition to providing services for the 160 INTRODUCTION TO MTP 161 Signaling Point A MTP2-A Signaling Point B MTP2-B Figure SS7 signaling link. transfer of user messages MTP3 includes procedures to reroute messages when a failure occurs in the SS7 signaling network. MTP3 is discussed in Sections through . At a signaling point there is an MTP1 and an MTP2 for each signaling link and a single MTP3 Fig. . The signaling links carry message signal units link status signal units LSSU and fill-in signal units FISU .

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