Posted by
Ray Yeapon Monday, April 19, 2010
at
8:12 AM
1 The sharing of a medium and its link by two or more devices is called _______.
A) modulation
B) encoding
C) line discipline
D) multiplexing
2 Which multiplexing technique transmits analog signals?
A) FDM
B) TDM
C) WDM
D) (a) and (c)
3 Which multiplexing technique transmits digital signals?
A) FDM
B) TDM
C) WDM
D) None of the above
4 Which multiplexing technique shifts each signal to a different carrier frequency?
A) FDM
B) TDM
C) Both (a) and (b)
D) None of the above
5 In synchronous TDM, for n signal sources of the same data rate, each frame contains _______ slots.
A) n
B) n + 1
C) n - 1
D) 0 to n
6 In TDM, the transmission rate of the multiplexed path is usually _______ the sum of the transmission rates of the signal sources.
A) greater than
B) less than
C) equal to
D) not related to
7 Which multiplexing technique involves signals composed of light beams?
A) FDM
B) TDM
C) WDM
D) none of the above
8 _________ utilization is the use of available bandwidth to achieve specific goals.
A) Frequency
B) Bandwidth
C) Amplitude
D) None of the above
9 ________ can be achieved by using multiplexing; ______ can be achieved by using spreading.
A) Efficiency; privacy and antijamming
B) Privacy and antijamming; efficiency
C) Privacy and efficiency; antijamming
D) Efficiency and antijamming; privacy
10 ________ is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.
A) Demodulating
B) Multiplexing
C) Compressing
D) None of the above
11 In a multiplexed system, __ lines share the bandwidth of ____ link.
A) 1; n
B) 1; 1
C) n; 1
D) n; n
12 The word ______ refers to the portion of a _______ that carries a transmission.
A) channel; link
B) link; channel
C) line; channel
D) line; link
13 ______ can be applied when the bandwidth of a link (in hertz) is greater than the combined bandwidths of the signals to be transmitted.
A) TDM
B) FDM
C) Both (a) or (b)
D) Neither (a) or (b)
14 FSM is an _________technique.
A) analog
B) digital
C) either (a) or (b)
D) none of the above
15 ____ is designed to use the high bandwidth capability of fiber-optic cable.
A) FDM
B) TDM
C) WDM
D) None of the above
16 ______ is an analog multiplexing technique to combine optical signals.
A) FDM
B) TDM
C) WDM
D) None of the above
17 _____ is a digital process that allows several connections to share the high bandwidth of a link.
A) FDM
B) TDM
C) WDM
D) None of the above
18 _____ is a digital multiplexing technique for combining several low-rate channels into one high-rate one.
A) FDM
B) TDM
C) WDM
D) None of the above
19 We can divide ____ into two different schemes: synchronous or statistical.
A) FDM
B) TDM
C) WDM
D) none of the above
20 In ________ TDM, each input connection has an allotment in the output even if it is not sending data.
A) synchronous
B) statistical
C) isochronous
D) none of the above
21 In ________ TDM, slots are dynamically allocated to improve bandwidth efficiency.
A) synchronous
B) statistical
C) isochronous
D) none of the above
22 In ________, we combine signals from different sources to fit into a larger bandwidth.
A) spread spectrum
B) line coding
C) block coding
D) none of the above
23 _______ is designed to be used in wireless applications in which stations must be able to share the medium without interception by an eavesdropper and without
being subject to jamming from a malicious intruder.
A) Spread spectrum
B) Multiplexing
C) Modulation
D) None of the above.
24 The _______ technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the sign modulates one carrier frequency;
at the next moment, the signal modulates another carrier frequency.
A) FDM
B) DSSS
C) FHSS
D) TDM
25 The ______ technique expands the bandwidth of a signal by replacing each data bit with n bits.
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