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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.
 
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Telecommunications
Related Terms

CLEC

erlang

IA

ILEC

Internet telephony

last mile

local loop

OLEC

telco

telephony

UNE


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