Q. A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. Differential PCM with 4 bit relative signal value is used. Then how many bits per second are actually sent?

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Q. Baseband is

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Q. Which of the following frequency ranges is used for AM radio transmission?

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Q. Synchronous protocols

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Q. Which of the following medium is used for broadband local networks?

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Q. Phase shift keying (psk) method is used to modulate digital signals at 9600 bps using 16 levels. Find the line signaling speed (i.e., modulation rate)

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Q. One important characteristic of the hub architecture of ARC-net is

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Q. How much power (roughly) a light-emitting diode can couple into an optical fiber?

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Q. A 2000-character text file has to be transmitted by using a 1,200 baud modem. Can you tell how long will it take?

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Q. The channel in the data communication model can be

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Q. The EIA-232 interface has _____ pins.

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Q. Which of the following signals is not standard RS - 232-C signal?

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Q. A communications medium that uses pulses of laser light in glass fibers. Select the best fit for answer:

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Q. Most data communications involving telegraph lines use:

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Q. Telecommunications networks come in a wide range of speed and capacity capabilities. Select the best fit for answer:

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Q. What frequency range is used for TV transmission and low power microwave applications?

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Q. Which of the following statement is correct ?

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Q. In communication satellite, multiple repeaters are known as

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Q. We can receive data either through our television aerial or down our telephone lines and display this data on our television screen. What is the general name given to this process?

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Q. The frequency range : 300 kHz to 3 MHz is used for

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