12 Facts About Telephone exchange

Telephone exchange, telephone switch, or central office is a telecommunications system used in the public switched telephone network or in large enterprises.

The term telephone exchange is often used synonymously with central office, a Bell System term.

Corporate or enterprise use, a private telephone exchange is often referred to as a private branch exchange, when it has connections to the public switched telephone network.

Telephone exchange is a telephone system for a small geographic area that provides the switching of subscriber lines for calls made between them.

One of the first to propose a telephone exchange was Hungarian Tivadar Puskas in 1877 while he was working for Thomas Edison.

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The world's first state-administered telephone exchange opened on November 12, 1877 in Friedrichsberg close to Berlin under the direction of Heinrich von Stephan.

George W Coy designed and built the first commercial US telephone exchange which opened in New Haven, Connecticut in January, 1878, and the first telephone booth was built in nearby Bridgeport.

These Telephone exchange designs promised faster switching and would accept inter-switch pulses faster than the Strowger's typical 10 pps—typically about 20 pps.

In common-battery systems, the pair of wires from a subscriber's telephone to the exchange carry 48V DC potential from the telephone company end across the conductors.

The Telephone exchange provides dial tone at that time to indicate to the user that the Telephone exchange is ready to receive dialed digits.

The first prototype digital switch was developed by Bell Labs as part of the ESSEX project while the first true digital Telephone exchange to be combined with digital transmission systems was designed by LCT in Paris.

Central Telephone exchange is almost always a single point of failure for local calls.