ethods and is migrating from analog to digital modulation techniques. Also known as BTV. One of the color signals of a color difference video signal the blue minus luminance signal. The Video Communication: the Whole Picture formula for deriving B-Y is -.30R, -.59G and -.89B. A group of eight bits usually the smallest addressable unit of information in a data memory storage unit. Also known as an octet. cable A number of insulated metallic conductors or optical fibers assembled in a group and covered by a flexible protective sheath. Sometimes used in a slang sense to refer to cable television. Cable Act of 1984 An Act passed by Congress that deregulated most of the CATV industry including rates, required programming and municipal fees. The FCC was left with virtually no jurisdiction over cable television except among the following areas: (1) registration of each community system prior to the commencement of operations; (2) ensuring subscribers had access to an A-B switch to permit the receipt of off-the-air broadcasts as well as cable programs; (3) carriage of television broadcast programs in full without alteration or deletion; (4) non-duplication of network programs; (5) fines or imprisonment for carrying obscene material; and (6) licensing for receive-only earth stations for satellite-delivered via pay cable. The FCC could impose fines on CATV systems violating the rules. The Cable Reregulation Act of 1992 superseded this Act. cable modems Cable modems are external devices that link PCs to cable television systems' coaxial networks to provide broadband connectivity. They work by modulating the Ethernet data that comes out of a PC, and converting it to a specific frequency to send it over the cable network. The cable modem also receives and demodulates incoming data, and re-converts it into Ethernet format. To the PC, a cable modem looks and acts like an Ethernet-based connection. Cable Reregulation Act Reregulation Bill 1515 that passed Congress in October of 1992, that forced the FCC to regulate cable televis