Frame. Base Station. (Used in mobile radio systems.) BELLCORE Bell Communications Research. (Research organi- Formerly British Telecom. (UK.) sation, incorporating parts of the former Bell Labor- atories, established after the divestiture of AT&T. Funded by the BOCs and RBOCs to formulate tele- Comite d'Action Commerciale. (Commercial Ac- communication standards.) tion Committee. Part of CEPT.) Bit Error Ratio. (Also called Bit Error Rate. It is a CAD/CAM Computer Aided Design/Computer Aided Manufac- measure of transmission quality. It is the number of ture. bits received in error during a transmission, divided Common Air Interface. (Radio communication by the total number of bits transmitted in a specific standard supported by ETSI.) interval.) Centralised Automatic Message Acconting. (A cen- Bit Error Ratio Tester. (Equipment used for digital tralised version of AMA, used in larger offices serv- transmission testing.) ing several smaller ones which may be too small to BETRS Basic Exchange Telecommunications Radio Ser- justify AMA on their own.) vice. CANTO Caribbean Association of National Telecommunica- Basic Exchange Radio. tion Organisations. (Association of state owned or Busy Hour Call Attempts. (Parameter used in the private telecommunications carriers providing do- design of telephone exchanges. It is the number of mestic and international services in the Caribbean.) calls placed in the busy hour. Also referred to as Community Antenna Radio Service. Busy Hour Calls or BHC.) Channel Associated Signalling. (CCITT signalling Bit Interleaved Parity. (A simple method of parity method.) checking.) Computer Aided Software Engineering (or Com- Built In Self Test. puter Aided System Engineering). BISYNC Binary Synchronous communications. (Older proto- Community Antenna Television Association. col used for character oriented transmission on half- Community Antenna Television. (Also refered to as duplex links.) Cable Television.) Acronyms 62/5 Canadian Broadcasting Corporation. CENELEC Comite Europeen de Normalisat