Design and Development of Electronic Telex Systems in India

Abstract

The paper deals with the design and development of Electronic Telex Systems in India right from its inception in the country. System design criteria for electronic telex are different from those for electronic telephone exchange due to special characteristics of telex which does not really need a conventional switched path through the switching network. Modern telex systems have also to provide for some data switching capabilities. System architectures in India for telex and data switching have been described explaining the design rationale behind each one of them. The first system was derived from the architecture of crossbar switching system but an autonomous unit was employed for bit coupling. Stored Program Control using specially-designed switching processor and character switching were introduced next. Followed by this, microprocessors were used to implement first the centralized and then the distributed control architecture for a modern telex and data switching system.