Central Office Code definition

Central Office Code or "CO Code" is the three digit switch entity indicator which is defined by the "D", "E", and "F" digits of a 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers. Historically, entire NXX code blocks have been assigned to specific individual local exchange end office switches.
Central Office Code. OR "CO CODE" is the three digit switch entity indicator which is defined by the "D", "E", and "F" digits of a 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers.
Central Office Code is the three-digit switch entity indicator that is defined by the fourth through sixth digits of a 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers.

More Definitions of Central Office Code

Central Office Code or "CO Code" is defined by the "D," "E," and "F" digits of a 10-digit telephone number within the North American Numbering Plan. Each NXX Code contains 10,000 station numbers. Historically, entire NXX code blocks have been assigned to specific individual local exchange end office switches, because, in general, this approach did not conflict with geographic numbering except as the CO approached number exhaustion. Where there are multiple COs in the same geographic area, this assignment method must change. With the advent of end-user telephone number portability, the usual one-on-one association on an NXX with an end office switching entity will be severed.
Central Office Code means the three (3)-digit switch entity indicator that is defined by the fourth (4th) through sixth (6th) digits of a ten (10)-digit telephone number within the NANP. Each NXX Code contains ten thousand (10,000) station numbers.
Central Office Code. OR "CO CODE"...............................II-6 1.60 "911 SERVICE".......................................................................II-6 1.61 "OWNER AND OPERATOR"................................................................II-6 1.62 "POI"...............................................................................II-6 1.63 "POLE ATTACHMENT"...................................................................II-6 1.64 "PROVIDER"..........................................................................II-6 1.65 "PUBLIC SAFETY ANSWERING POINT" OR "PSAP"...........................................II-6 1.66 "RATE CENTER".......................................................................II-6 1.67 "RIGHT-OF-WAY" OR "ROW".............................................................II-7 1.68 "ROUTING POINT".....................................................................II-7 1.69 "SERVICE CONTROL POINT" OR "SCP"....................................................II-7 1.70 "SERVICE SWITCHING POINT" OR "SSP"..................................................II-7 1.71 "SIGNALING POINT" OR "SP"...........................................................II-7 1.72 "SIGNALING SYSTEM 7" OR "SS7".......................................................II-7 1.73 "SIGNAL TRANSFER POINT" OR "STP"....................................................II-7 1.74 "SUBSIDIARY"........................................................................II-7 1.75 "SYNCHRONOUS OPTICAL NETWORK" OR "SONET"............................................II-7 1.76 "SWITCHED ACCESS SERVICE"...........................................................II-7 1.77 "TELECOMMUNICATIONS SERVICES".......................................................II-7 1.78 "THIRD PARTY CONTAMINATION".........................................................II-8 1.79 "TRUNK SIDE"........................................................................II-8 1.80 "UNDEFINED TERMS"...................................................................II-8 1.81 "VERTICAL FEATURES" (INCLUDING "CLASS FEATURES")....................................II-8 1.82 "WIRE CENTER".......................................................................II-8 ARTICLE III GENERAL PROVISIONS...................................................................................III-1
Central Office Code means the three digit switch entity indicator that is defined by the “D”, “E”, and “F” digits of a 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers.
Central Office Code is the three digit switch entity indicator that is defined by the "D", "E", and "F" digits of a 10 digit telephone number within the North American Numbering Plan (NANP).
Central Office Code means the first three digits of a seven-digit telephone number. Central office codes are assigned to telecommunications providers by the central office code administrator in accordance with the industry’s central office code assignment guidelines.
Central Office Code or "CO Code" is the three-digit switch entity indicator which is defined by the fourth, fifth and sixth digits of a 10-digit telephone number within NANP.