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THE TELEPHONE CIRCUIT
TRANSMISSION CODES AND ERROR DETECTION AND CORRECTION
UNIVERSAL ASYNCHRONOUS RECEIVERTRANSMITTER
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232C interface amplitude analog signal ASCII attenuation distortion bandwidth bit rate buffer C-message noise cable called carrier frequency channel banks circuit clock companding control characters control field converter cursor data link control data transmission demodulator detection device dial switch dial-up digital data distortion EBCDIC echo suppressor encoding envelope delay envelope delay distortion error FCS Flag 7E filter format fundamental frequency HDLC identified input bit rate loop master group maximum mode modem multiplexed multipoint N N E D nonlinear number of bits operator output packet parity bit phase phase jitter poll positive acknowledgment private-line protocol pulses Read Modified received signal RLSD sample SDLC secondary shift shown in Figure signal power Staco station controller super groups synchronous T-carriers Telco telephone transmission rate UART unprotected voice band voltage Y Y L