ted site by sensitive, directional antennas and then transmitted to subscribers via a cable network. Addi- tional channels, not normally available in that area, can also be transmitted. Traditional analog CATV is based on RF transmission, generally using 75-ohm coaxial cable as the transmission medium. CATV offers multiple frequency-divided channels, allowing mixed transmissions to be carried simultaneously. C-band A portion of the electromagnetic spectrum, approximately 4GHz to 6GHz, that is used primarily for satellite and microwave transmission. CBQ (Class-Based Queuing) A fully open, nonproprietary technology that brings band- width-controlled CoS to IP network infrastructures. It allows traffic to be prioritized according to IP application type, IP address, protocol type, and other variables. It allocates unused bandwidth CBR (constant bit rate) more effectively than other QoS mechanisms do, and it uses priority tables to give critical appli- cations the most immediate access to unused bandwidth. CBR (constant bit rate) The highest ATM service class. CBR provides a constant, guaran- teed rate to real-time applications such as streaming video, providing continuous bandwidth. It emulates a circuit-switched approach and is associated with minimum latencies and losses. CCITT (Comité Consultatif International de Téléphonie et de Télégraphie) An advisory committee to the ITU whose recommendations covering telecommunications have international influence among engineers, manufacturers, and administrators. It is now known as the ITU-T. CCK (Complementary Code Keying) A modulation scheme used with 802.11b WLANs. CCK was adopted to replace the Barker Code in wireless digital networks. CCS (common-channel signaling) An electronic means of signaling between two switch- ing systems, independent of the voice path. The use of CCS makes possible new customer ser- vices, versatile network features, more flexible call routing, and faster connections. CDDI (Copper-Distributed Data Interface) A version of FDDI that runs on UTP c