telephone exchange

operator, switchboard operator, system for handling many telephone calls, central telephone network system

In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central office is the physical building used to house inside plant equipment including telephone switches, which make phone calls "work" in the sense of making connections and relaying the speech information.
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Noun
1. a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication
(synonym) central, exchange
(hypernym) workplace, work
(hyponym) centrex
(part-holonym) telephone system, phone system

Synonym central office.

telephone exchange
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