able rather than on fiber-optic cable. CDM (Code Division Multiplexing) A form of multiplexing that encodes data with a spe- cial code associated with each channel and uses the constructive interference properties of the special codes to perform the multiplexing. CDMA (Code Division Multiple Access) A digital cellular technology that uses spread spectrum techniques. With CDMA, every channel uses the full available spectrum, and individ- ual conversations are encoded with a pseudorandom digital sequence or frequency-hopping schedule. CDMA2000 A family of 3G mobile standards that use CDMA to send voice, data, and signal- ing data between mobile phones and cell sites. CDMA2000 devices include color displays, GPS, digital and video cameras, push-to-talk, support for streaming-type real-time VOD/audio-on- demand services, and voice recognition functions. Also known as IMT-2000 CDMA Multi- Carrier (CDMA-MC). CDMA450 A TIA/EIA-IS-CDMA2000 (CDMA-MC) system deployed at 450MHz. CDMA450 provides a larger cell size compared to other bands, which translates to fewer cell sites and signif- icantly lower capital and operating expenditures to service vast coverage areas. cdmaOne A 2G CDMA technology (IS-95) that offers data rates of 9.6Kbps to 14.4Kbps. cdmaOne describes a complete wireless system based on the TIA/EIA IS-95 CDMA standard and represents the end-to-end wireless system and all the necessary specifications that govern its opera- tion. cdmaOne provides a family of related services, including cellular, PCS, and wireless local loop. CDPD (Cellular Digital Packet Data) A North American standard for transferring packet data over cellular phone channels. CD-ROM (compact disc-read only memory) A storage device that is used in computer systems and typically contains multimedia information. cell A fixed-length packet. Glossary cell relay cell relay A form of packet transmission used by ATM networks. Cell relay transmits 53 octet fixed-length packets over a packet-switched network. Because the cells are tiny and of fixed leng