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CO – central office

Webopedia Staff
Last Updated May 24, 2021 7:38 am

CO is short for central office.

In telephony, a CO is a telecommunications office centralized in a specific locality to handle the telephone service for that locality. Telephone lines are connected to the CO on a local loop. The CO switches calls between local service and long-distance service. ISDN and DSL signals also channel through the CO.