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allocated alternative amplitude modulation analogue analyser attenuation band bandwidth baseband baud binary bit rate bit stream bit/s BT Eng cable carrier CCITT CCITT recommendations character circuit clock common-channel signalling communications components connected connectors crosspoint switches data transmission detector dialling dibits digital signals digital switching diode display duplex enables error example exchange facilities facsimile filter frequency Frequency modulation HDB3 input interface ISDN kbit/s layer low-pass Mbit/s measurement mobile modems multiplex noise normally ohms operation oscillator output PABXs packet switched parity bit phase phase detector POEE PSTN public network pulse radio receive reference routing sample satellite Section shown in Figure sideband slot speech standard station switching centre synchronous techniques telecommunications telephone telex terminal equipment transmitted trunk two-wire typical voice channels voice-frequency voltage waveform