telephone exchange(n = noun.artifact) central, exchange - a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication;
is a kind of work, workplace
is a part of phone system, telephone system
has particulars: centrex, patchboard, plugboard, switchboard

   A central office in which the wires of telephones from local subscribers may be connected by switches to other local telephones or to long-distance lines, to permit transmission of conversation or data.
"In the late 1990's the traditional copper wires connecting local telephones to the telephone exchange have begun to be replaced with optical fiber connections." [Webster 1913 Suppl.]

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