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The digital program-controlled switch adopts the most advanced microprocessor as the control core, with a fully decentralized control method, modular programming, and the selection of large-scale TTL and CMOS digital integrated circuits, making the entire machine highly stable and reliable. Fully functional, low power consumption, small size, and light weight. In terms of interface configuration, it has the advantages of flexible interface configuration and convenient networking. The interface configuration is roughly divided into two parts, namely the inner line part and the outer line part. The internal line includes ordinary user interfaces, 2B+D digital user loops, 2.048Mbit/sPCM interfaces, and U trunk interfaces.
The digital program controlled switch system is composed of various dispersed functional modules. Each module has its own processor, and each module processor is at the same level in the entire system, which can relatively independently complete some functions. The exchange network (SNM) and message distribution network (MDM) that complete inter module communication and session exchange form an interconnection network, which is the core part of the entire system; Each module processor transmits various information (including call, billing, and maintenance information) through the system’s message distribution network MDM and SNM are the gathering and distributing places for various messages in the system, which complete the collaboration between modules through message distribution networks, thereby achieving the coordination of the entire system; The exchange of voice messages between peripheral modules is completed through the exchange network module, and the connection of the session is completed. The peripheral modules can handle some functions relatively independently, and the peripheral exchange module can handle calls independently. When the call involves other modules, the message allocation module can send a request for cooperation to the relevant modules; If new functions need to be added, only new functional modules need to be added, and the corresponding switching path is provided by SNM. The interface of this module can be easily accessed as long as it meets the interface standards between modules, achieving the goal of adding new functions. However, the entire system structure does not need to be adjusted The overall structure of the multi module system of the programmable digital switch: the operation and maintenance module (OMM), message distribution module (MDM), and switching network (SNM) form the central module, which is the exchange place for the digital programmable switch system’s sessions and messages; The capacity of the switching network has been expanded through SNM, communication between multiple MPs has been simplified through MDM, and centralized maintenance functions of the system have been achieved through OMM.