Q. After coding a document into a digital signal, it can be sent by telephone, telex or satellite to the receiver where the signal is decoded and an exact copy of the original document is made. What is it called?

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Q. Which of the following data transmission media has the largest terrestrial range without the use of repeaters or other devices?

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Q. The area of coverage of a satellite radio beam is known as

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Q. In geosynchronous orbit, satellite

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Q. What frequency range is used for microwave communications, satellite and radar?

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Q. A 4 KHz noise less channel with one sample ever 125 per sec is used to transmit digital signals. If Delta modulation is selected, then how many bits per second are actually sent?

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Q. A 6-MHz channel is used by a digital signaling system utilizing 4-level signals. What is the maximum possible transmission rate?

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Q. Number of bits per symbol used in Baudot code is

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Q. An example of digital, rather than analog, communication is

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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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