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Part OneIntroduction and Overview
A Typical Telephone Call
16 other sections not shown
analog AT&T automatic automatic message accounting baseband basic Bell Laboratories Bell System BISCUS/FACS cable pairs calls capacity carrier systems central office coaxial coin connection cost Crossbar crossbar switch customer's data sets developed economic electronic Electronic Switching Systems engineering equipment example exchange facilities network facility terminal frequency functions input installation interconnection interface key telephone key telephone systems load located long-haul loop loss maintenance mastergroup measurements modulation multiplex noise off-hook on-hook operating companies output path percent performance PICTUREPHONE plant private-line public telephone network pulses radio repeater route Section served shown in Fig signal special-service circuits station Step-by-Step switching network switching systems tandem telephone company telephone service telephone set teletypewriter tion TOUCH-TONE traffic networks transmission facilities transmission systems transmitted trunk group unit voice-frequency voiceband voltage Western Electric wire center