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Professor of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor. Coauthor of various articles on telecommunications technology.AllBritannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....Historycoaxial cablecombiningFrequency-division multiplexingAnalog multiplexing, as employed in the North American telephone systemIn frequency-division multiplexing (FDM), 12 separate voice signals, each of 4-kilohertz bandwidth, are modulated onto carrier waves in the 60â108-kilohertz range. These modulated signals are combined to form a single complex group signal. Groups are further combined to form a hierarchy of increasing bandwidth and voice-carrying capacity.bandwidthfrequencyanaloganalogtelephonepoint-to-point microwavedeployedTime-division multiplexingDigital multiplexing, as employed in the North American telephone systemIn time-division multiplexing (TDM), 24 digitized voice signals, each at 64 kilobits per second, are assigned successive time slots in a 1.544-megabits-per-second signal. Combined signals are further combined to form data streams of increasing bit-rate and voice-carrying capacity.datavalueradio waveT1 systems
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