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architecture ASCII bandwidth baseband baud bisync bits per second branch exchange broadband broadband cable cable system CableNet called capability central channel chapter characters circuit coaxial cable commonly communicating devices communications systems connection copier Corporation cost CSMA/CD data base data communications data rate Data-Link Control developed digital signals disk EBCDIC electronic equipment Ethernet fiber-optic cables Figure frame frequency full-duplex functions half-duplex HDLC high-speed installation interconnection interface kind Layer Layer logic machines Management method modem move information node Open System Interconnection operating OSI model PABX packet packet switching paper Photo courtesy physical printer productivity protocol receiving requirements ring network Rolm scheme SDLC session layer speed standard stations switching synchronous techniques telephone lines telephone system terminal throughput tion tones topology traffic transmission medium transmit vendor voice voltage wire word processor Xerox