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Q. Explain Frequency-division multiplexing?
Frequency-division multiplexing (FDM) is a technique for data transmission widely used in telephone, radio, and cable TV systems in which the transmission frequency spectrum (i.e., bandwidth) is divided into smaller bands known as subchannels.
Data transmission between two stations can be achieved in either simplex, half-duplex, or full-duplex mode. In a simplexmode,mainly used in radio and TV broadcasts, information travels only in one direction. Thismode is rarely used in data communications. In half-duplexmode, used by radio communications, information may travel in both directions, but only in one direction at a time. The transmitter becomes the receiver and vice versa. In a full-duplex mode, information may travel in both directions simultaneously. This mode, used in telephone systems, adopts two different carrier frequencies.
Define port? Give types of port available? Ans: An I/O interface consists of circuitry needed to connect an I/O device to computer bus. One side consists of a data path contain
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A system contains 10 units of resource class Ru. The resource requirements of three user processes P1, P2 and P3 are as follows
Which of the fastest logic: TTL, ECL, CMOS and LSI ? Ans. The fastest logic family of all logic families ECL. High speeds are possible in ECL since the transistors a
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