13. What is true for frequency division multiplexing? A. It is a technique for t
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13. What is true for frequency division multiplexing? A. It is a technique for transmitting information from several different sources simultaneously over a wideband channel. B. It is a technique for transmitting information from several different sources serially over a wideband channel C. It is a technique for transmitting information from several different sources serially and simultaneously over a wide band channel D. It is not used in digital transmission. E. None of the above is true. 14. In a satellite communication system, a feeder link may represent: A. An uplink B. A down link C. Neither an up link nor a down link O. Both an up link and a down link E. None of the above is true. 15. What is true for the amplitude shift keying? A. In this technique, a binary signal is switched on and off with a carrier sinusoid. B. In this technique, a carrier sinusoid is switched on and off with a binary signal. C. In this technique, a binary signal is shifter with a carrier sinusoid. D. In this technique, a carrier sinusoid is shifter with a binary signal. E. None of the above is true. 16. An up link frequency is: A. 1.6MHz B. 16 MHz C. 160 MHz D. 1600MHz E. None of the above is true.Explanation / Answer
13(c)
In telecommunications, frequency-division multiplexing (FDM) is a technique by which the total bandwidth available in a communication medium is divided into a series of non-overlapping frequency bands, each of which is used to carry a separate signal. This allows a single transmission medium such as a cable or optical fiber to be shared by multiple independent signals. Another use is to carry separate serial bits or segments of a higher rate signal in parallel.
The most natural example of frequency-division multiplexing is radio and television broadcasting, in which multiple radio signals at different frequencies pass through the air at the same time. Another example is cable television, in which many television channels are carried simultaneously on a single cable. FDM is also used by telephone systems to transmit multiple telephone calls through high capacity trunklines, communications satellites to transmit multiple channels of data on uplink and downlink radio beams, and broadband DSL modems to transmit large amounts of computer data through twisted pair telephone lines, among many other uses
14(o)
As in satellite both uplink and downlink are necessary. So the feederlink may represent as both uplink and downlink.
15(a)
Amplitude-shift keying (ASK) is a form of amplitude modulation that represents digitaldata as variations in the amplitude of a carrier wave. In an ASK system, the binary symbol 1 is represented by transmitting a fixed-amplitude carrier wave and fixed frequency for a bit duration of T seconds. If the signal value is 1 then the carrier signal will be transmitted; otherwise, a signal value of 0 will be transmitted
16(e)
As the uplink frequency is about 5GHz to 40GHz
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