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Consumer Electronics by S. P. Bali

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MESSAGE SWITCHING

As one telegraph system after another was installed in the countries around the world, nationwise communications networks evolved. A message could be sent from one point to another even if the two points were not serviced by a common telegraph line. In this case, telegraph operators at intermediate points would receive a message on one line and retransmit it on another when a telegraph office had several lines emanating from it, the process of transferring a message from one line to another was, in essence, a switching function.

One of the world's largest message switches was completely automated in 1963 when Collins Radio Company installed a computer-based message switch for airline companies of North America. This system and ...

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