CCITT No. 7 transfer mechanisms
Richard J. Manterfield · Institution of Engineering and Technology eBooks · 1991
The transfer of signalling information between signalling points is achieved by the message-transfer part (MTP) and the signalling-connection control part (SCCP). The MTP and SCCP do not understand the meaning of the messages being transferred, but it is their job to deliver the information in an uncorrupted form from one signalling point to another. For circuit-related applications (e.g. telephony), the MTP provides an adequate transfer mechanism. For non-circuit-related applications (e.g. general data transfer), a combination of the MTP and SCCP is required. The MTP comprises Levels 1 to 3 of the 4-level structure. The combination of the MTP and SCCP lies within Layers 1 to 3 of the OSI 7-layer model. Sections 5.2 to 5.5 of this chapter describe the functions of the MTP and Section 5.6 covers the SCCP.