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2-to-4-level converter 8PSK 8QAM amplifier amplitude analog input analog signal antenna balanced modulator bandwidth baseband baud Binary code binary input bit rate block diagram BPSK cable called carrier frequency carrier recovery circuit carrier system channel banks clock codec companding compression Consequently data link data rate decoding delta modulation demodulated determine digital transmission dynamic range earth station EBCDIC encoding equal equivalent noise temperature fiber format HDLC information frames input signal interface logic magnitude mastergroup maximum Mbps minimum bandwidth mode multiplexing noise figure number of bits operation output phase output spectrum packet PCM code poll primary product detector propagation protocol pulse Q-channel QPSK QPSK modulator quantization radio ratio receive data sample satellite SDLC secondary station segment sequence shown in Figure supergroup switch SYN character terminal transmit voice band voice band channels voltage