be sent to A 3G technology for carrying high-speed data multiple recipients or locations. and multimedia traffic on cellular networks. Glossary CDMA2000 1X (Code-Division Mul- circuit switching tiple Access 2000) The establishment-by dialing-of a tempo- The earliest version of the CDMA2000 3G rary physical circuit (path) between points. technology for carrying high-speed data and The circuit is terminated when either end of multimedia traffic on cellular networks. the connection sends a disconnect signal by hanging up. CDMA2000 1xEV-DO (Code-Division Multiple Access 2000 Data Optimized CLEC (Competitive Local Exchange or Data Only) Carrier) A later, higher-data-rate version of CDMA2000 A competitor to incumbent local telephone 1X 3G technology for carrying high-speed companies that has been granted permis- data and multimedia traffic on cellular sion by the state regulatory commission to networks. offer local telephone service. CLECs com- pete with the incumbent telephone company. central office CLECs are also simply called local telephone The site in the Public Switched Telephone companies. Network with the local telephone company's CLID (Calling Line ID) equipment that routes calls to and from cus- The number that identifies the telephone tomers. It also has equipment that connects number from which a call was placed. For customers to Internet service providers and most residential customers, the calling line long-distance services. ID is the same as their billing number, their Automatic Number Identification (ANI). channel A path for analog or digital transmission sig- CO (Central Office) nals. With services such as ISDN, T1, and The location that houses the telephone com- T3, multiple channels share the same one or pany switch that routes telephone calls. two pairs of wires or fiber. End offices are central offices that connect end users to the Public Switched Telephone CIC (Carrier Identification Code) Network. The four-digit code (previously three digits) assigned to each carrier for billing and call- compr