Application Service Elements

We say that a signaling point (SP) performs a set of functions in a telecommunication network. In the CCITT/ITU-T model of signaling system No.7, each function (application) that requires remote operations has an application service element (ASE), which handles the signaling aspects for that application [4-6]. In Fig. 13.2-1, SP-A is an exchange equipped for two transaction types, and has two ASEs. INASE handles the signaling messages for IN services, and OMASE takes care of the messages in operation/administration/maintenance (OM) transactions. The INASE and OMASE in SP-A communicate with their respective "peers" in an IN database (SP-B), and in an OAM center (SP-C). The messages exchanged between ASEs are known as components.

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