Integrated Digital Transmission and Switching

Speech and other signals are digitally encoded and a common method of time division multiplexing is used in both transmission and switching equipment. The main advantage of this system is that the transmission loss encountered by speech becomes more or less independent of both distance and the number of exchanges through which a call is routed.

2 Stored Program Control (SPC) is the application of data processing and computer techniques to an exchange, thus providing a powerful, flexible method of controlling the operation of the exchange.

3 Common Channel Signalling (CCS) uses just one (go and return) pair of signalling channels, not directly associated with the traffic circuits, for performing all the signalling functions of an entire route which may contain several hundred traffic circuits.

4 Microelectronics technology is the application of solid- state semi-conductor technology to provide components which range in function from a single active element (e.g. a transistor) to large scale integrated circuits. Use of this technology offers small physical size and reliability together with automated design, manufacture and testing. The components are fixed onto printed circuit boards, and if there is a fault the defective printed circuit board can be taken out and replaced by another in a matter of seconds.

Task 6. Найдите в тексте понятия, имеющие следующие функции:

1. The application of solid- state semi- conductors to provide greater reliability, smaller size and automated design.
2. The application of data- programming techniques to an exchange, providing greater control and flexibility in the operative of an exchange.
3. The use of one pair of channels not directly associated with the traffic circuits, to perform all signalling functions on a complete route.
4. Speech and other signals are digitally encoded and a common method of time- division multiplexing is used.