Title :
Electronic exchange system. Part 1: Structure
Author_Institution :
Standard Telephones & Cables Ltd., London, UK
fDate :
8/1/1971 12:00:00 AM
Abstract :
Continuing from another paper, the equipment for the structure of an electronic telephone exchange is described together with the reasons for the choices made. Analogue circuits are switched by p.a.m./t.d.m. (pulse-amplitude-modulation/time-division-multiplex) switches and p.c.m. (pulse-code-modulation) circuits by t.d.m. switches of the same kind. The use of t.d.m. switches profoundly influences the choice of processors for supervisory, signalling and other low-level functions, which, in turn, have some effect on the high-level common and unique common processors which are the subject of Pt. 2 of the paper.
Keywords :
pulse amplitude modulation; pulse-code modulation; telephone exchanges; time division multiplexing; PAM; PCM circuits; TDM switches; analogue circuits; control section; electromechanical systems; electronic telephone exchange; high level processor; low level functions; processors; pulse amplitude modulation; pulse code modulation; signalling; structure; supervisory; switches; switching circuits; telephone exchanges; time division multiplexing; transmission circuits;
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
DOI :
10.1049/piee.1971.0194
