Basic concept

　　Since the concept of the intelligent network system was put forward in 1980, the system has made rapid development by upgrading its technology and implementing standardization. Foreign telecom networks have applied the technology, which help finish the construction, maintenance and operation of new services of telecom with a kind of brand-new way. So far, it has brought remarkable economic benefits.

　　The concept of the intelligent network originated from U.S.A. At that time, AT&T Company offered 800# (free call) and 200# (account card) services by the means of integrated data store. Later, International Telecom Union ITU-T announced Q.1200 series suggestions, i.e., intelligent network capacity set 1 (CS-1), and named intelligent network formally. Intelligent network is a kind of additional network structure so as to offer telecom new services quickly, conveniently and economically based on the basic network structure of existing exchange and transmission. It can be seen, the purpose of IN is to offer new services.

　　Outstanding merit that intelligent network offers the new services is that it can accomplish the new services quickly, economically and conveniently. The generation of a new service only needs a few months. This not only means the great reduction of development investment, but also can open the new services to users in advance, which can regain a large number of funds early, raise the utilization ratio of the network and strengthen intelligentization of the network. Due to the restriction of standard model of intelligent network technology, the system can be realized independent of new services that will generate, and the interconnection of products can be supported by standard communication protocol, thus the basic conditions for offering new services fast has been provided. Furthermore, the peculiar systems structure of intelligent networks is an inherent term of offering new services fast. Therefore, we should say that the way that intelligent network provides new services is essentially different from other ways.

Figure 1 Intelligent Network System Structure

　　 SMP: Service Management Point. In conformity to service subscriber parameters, storage, management statistical data, management service data, and service subscriber data.

　　 SMAP: Service Management Access Point. Terminal unit of realizing management function by the access of SMP.

　　 SCP: Service Control Point. Concentrate all functions and data of real-time control intelligent service call

　　 SDP: Service Data Point. Responsible for intelligent network data processing.

　　 IP: Independent Peripherals, also called Intelligent Peripherals. Produce voice prompt and provide other resources of service processing.

　　 SSP: Service Switching Point. Trigger intelligent network service in the switching network.

　　 SCE: Service Creation Environment. Realize service creation and edition by employing SIB.

　　 Other equipments: Include INES, CDR and other systems related to intelligent network.