Before the digital T-1 system, carrier wave systems such as 12-channel carrier systems worked by frequency division multiplexing; each call was an analog signal.
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With ADSL, the modem and the DSLAM communicate by a protocol called discrete multitone modulation ( DMT ), which is a form of frequency division multiplexing.
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"' DVB-T "'uses coded orthogonal frequency division multiplexing ( COFDM ), which uses as many as 8000 independent carriers, each transmitting data at a comparatively low rate.
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Can u explain me in detail the pulse width modulation using frequency division multiplexing ? Preceding contribs ) 02 : 24, 4 April 2011 ( UTC)
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A wide-band data link from the gateway to the user terminal employs an Orthogonal Frequency Division Multiplexing ( OFDM ) with a Time Division Multiplex ( TDM ) overlay.
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By using frequency division multiplexing, an HFC network may carry a variety of services, including analog TV, digital TV ( SDTV or HDTV ), video on demand, telephony, and high-speed data.
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Flash-OFDM, which stands for Orthogonal Frequency Division Multiplexing, has other attributes beyond speed : It was designed to work well in moving cars and trains while requiring less spectrum than some wireless technologies.
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Telephone trunk lines, and especially frequency division multiplexing carrier systems, are usually 4-wire circuits rather than 2-wire circuits ( or at least they were before fibre-optic became widespread ) and require a different kind of cable.
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Analog and digital modulation facilitate frequency division multiplexing ( FDM ), where several low pass information signals are transferred simultaneously over the same shared physical medium, using separate passband channels ( several different carrier frequencies ).
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At the core of the coalition is the technology called Vector Orthogonal Frequency Division Multiplexing-- which Cisco says delivers two-way data, voice and video communications over the air with speed and quality comparable to today's cable networks.
