| 释义 |
CO (Central Office) 1. A local telephone company office that provides a central point for the termi- nation of lines and trunks, and where they can be interconnected, i.e., connections can be exchanged. An integral part of the public switched telephone network (PSTN), a CO traditionally houses one or more voice-optimized circuit switches to interconnect subscriber lines within a local area known as the carrier serving area (CSA) and to connect subscriber local loops to network trunks.A contemporary CO may also house a variety of voice and data switches, multiplexers, concentrators, and so on. Synonymous with central office exchange (COE), Class 5 office, end office, and local exchange. See also CSA and PSTN. 2. The CO switch, rather than the building that houses it. Synonymous with Class 5 switch, edge switch, end office, and local exchange. |