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Consumer Electronics by S. P. Bali

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NONVOICE TRAFFIC

For half a century telephone technology has dominated telecommunications. There have been 1000 times as many telephone subscribers as other types of telecommunication users. Consequent economics of scale have dictated that telegraph and data traffic should be converted to a form in which they can travel over the telephone system.

Since 1970s new types of common carriers emerged and built their own non telephone networks. Separate data transmission networks for computer users are available in all major industrial countries. Some of these operate by attaching special equipment to the telephone networks. Others employ new transmission networks, physically separate from the telephone networks.

Telephone traffic and computer traffic ...

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