ESAT Forouzan - Chapter 6: Multiplexing

Question 1

The sharing of a medium and its link by two more devices is called ______.
a. Modulation
b. Encoding
c. Line Encoding
d. Multiplexing

Answer 1

d. Multiplexing

Question 2

Which multiplexing technique transmits analog signals?
a. FDM
b. TDM
c. WDM
d. (a) and (c)

Answer 2

d. (a) and (c)

Question 3

Which multiplexing technique transmits digital signals?
a. FDM
b. TDM
c. WDM
d. None of the above

Answer 3

b. TDM

Question 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

Answer 4

a. FDM

Question 5

In 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

Answer 5

a. n

Question 6

In TDM. The transmission rate of the multiplexed path is usually _______ the sum of the transmission rate of the signal sources.
a. Greater than
b. Less than
c. Equal to
d. 1 less than

Answer 6

a. Greater than

Question 7

In AT&T’s FDM hierarchy, the bandwidth of each group type can be found by multiplying ______ and adding extra bandwidth for guard bands.
a. The number of voice channels by 4000 Hz
b. The sampling rate by 4000 Hz
c. The number of voice channels by 8 bits/ sample
d. The sampling rate by 8 bits/sample

Answer 7

a. The number of voice channels by 4000 Hz

Question 8

DS-1 through DS-4 are __________ while T-1 through T-4 ___________.
a. Services; multiplexers
b. Services; signals
c. Services; lines
d. Multiplexers; signals

Answer 8

c. Services; lines

Question 9

In a T-1 line, ____________ interleaving occurs.
a. Bit
b. Byte
c. DS-0
d. Switch

Answer 9

b. Byte

Question 10

Guard bands increase the bandwidth for ____________.
a. FDM
b. TDM
c. Both (a) and (b)
d. None of the above

Answer 10

a. FDM

Question 11

Which multiplexing technique involves signals composed of light bemas?
a. FDM
b. TDM
c. WDM
d. None of the above

Answer 11

c. WDM