Write short notes on any two of the following:-

a. Microwave transmission. 

b. Time Division Switch.

c. Cellular System. 

d. Amplitude Modulation (AM)

Subject Data Communication
NU Year Set: 2.(e) Marks: 8 Year: 2008

Microwave radio, a form of radio transmission that uses. Ultra-high frequencies developed out of experiments with radar (radio detecting and ranging) during the period preceding World War II. There are several frequency ranges assigned to microwave systems, all of which are in the GigaHertz (GHz) range and the wavelength in the millimeter range. This very short wavelength gives rise to the term microwave. Such high-frequency signals are especially susceptible to attenuation and, therefore must be amplified or repeated after a particular distance.

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