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The Telephone System
Telephone Carrier Elements
Wire Transmission Principles
4 other sections not shown
amplifier unit amplitude attenuation balanced-bridge modulator bandpass filter basic cable carrier systems cable pair capacitance capacitor carrier channel carrier currents carrier equipment carrier frequency carrier oscillator carrier signals carrier terminal Carrier Transmissions central office channel carrier channel units coaxial cables common compandor conductors connected crosstalk decibel demodulator directional filter four-wire carrier frequency band GTE Lenkurt Hertz high-pass filter hybrid hybrid coils impedance inductive input Lenkurt load loss low-pass filter lower sideband mastergroup microwave radio modulation process multiplex noise ohms open-wire lines operations output PCM carrier systems phantom circuit Pi pad pilot frequency polarity pregroup units pulse train quency range reactance receiving branch rectifier repeating coil resistance resistor sampling schematic shunt speech signals supergroup supergroup receive synchronizing telephone line toll trunk trans transmitting branch two-wire upper sideband VF channels voice channels voice frequency voice signals voice-frequency voltage wire