Page 22 - Intelligent Communication Systems

6 INTELLIGENT COMMUNICATION SYSTEMS
(3) A network is connected to other networks, which are provided by the
other different common carriers. Therefore, the interface for interconnection of net-
works has to be standardized.

As one IN architecture model, Bell Laboratories has invented the advanced
intelligent network (AIN). In this architecture, the functional component (FC), a
set of standardized call-control commands, has been introduced. The FC is ser-
vice independent, so any services can use it for their implementations.
The service switching point (SSP) is a switching system that accommodates
subscribers and information providers. It may be a stored-program-controlled
switching system or an ATM switching system.
The services control point (SCP) includes the following modules.
. Service logical program (SLP): provides call processing functions
« Service logical interpreter (SLI): executes SLP according to the request
for interconnection
• Network interface database (NID): stores the information concerning
clients and networks
• Network resource management (NRM): manages the network resources
for call processing

These modules may be installed in an SSP according to traffic conditions and
may be transferred to an SSP that is located at the remote site. And SLI and NID
may be used in any IN-based network.
The service management system (SMS) provides the functions of network
operation, management, and maintenance. For example, the service creation envi-
ronment (SCE) module supports the development of a new service. As the trans-
mission protocols between a client and a network or between networks, the X.25,
No. 7, and ISDN protocols are mainly used.
In many countries, especially advanced countries such as the United States,
the European Union (EU), and Japan, new services, including computer telephony
integration (CTI) services, have been developed on the intelligent network. At
the same time, network architectural studies have been conducted. In the future,
more advanced systems and services will be implemented and put into practical
use based on IN architecture.