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This document discusses the evolution of switching systems from early message switching to modern electronic switching using stored program control. It covers early message switching using paper tapes and later electronic storage. It then discusses the need for circuit switching with telephony and compares message and circuit switching. It outlines the basic functions of a switching system including attending, information receiving/processing, busy testing, interconnection, alerting, and supervision. It als

Author

Deepa Shree

Language

EN