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CO Last modified: Thursday, January 30, 2003
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.
	Related Categories Telecommunications Related Terms CLEC erlang IA ILEC Internet telephony last mile local loop OLEC telco telephony UNE