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amplitude analog signals applications areas ASCII AT&T baseband baud rate Baudot Baudot code binary block buffer capability channel checking circuit coaxial cable combinations common carrier components conﬁguration connected control character CSMA/CD data communications Data Link Control data processing data transmission deﬁned developed devices Dibits duplex EBCDIC efﬁcient electrical signals electronic encryption equipment ﬁeld Figure ﬁles ﬁrst ﬂow frequency functions host computer indicate intemal interface ISDN keyboard Layer located loop message switching microwave mode modem modulation monitor multiplexer Network Architecture node noise operating optic ﬁber OSI model packet switching parity bit performed polling printers processor programs protocols pulses radio receiver Redundancy retransmission satellite sender slot speciﬁc speed standard station synchronous Systems Network Architecture telecommunications telephone terminals trafﬁc Tymnet types vendors voice voice grade wire pairs zero