题目内容

For Multiplexing,

A. FDM divides frequency spectrum into frequency bands
B. TDM allows mutilple signals to be transmitted on
C. the channel at the same time
D. TDM has higher efficiency than FDM

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PSTN (public switched telephone network) consists:

A. Local loop, toll connecting trunk, and inter-toll trunk
B. Telephone and central office
C. Local loop, trunks, and switching office
D. Telephone, end office, and trunks

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Quadrature Phase-shift Keying

A. Converts digital data to analog signal
B. The baud rate is twice the bit rate
C. Allows 64 different combinations
D. The phase shifted is 180 degree

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Compare with UTP and COAX

A. UTP is more expensive
B. UTP is more prone to noises
COAX requires more boosts
D. COAX is eayier to install

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Compare Optical fibers with copper wires

A. Optical fibers are heavier than copper wires
B. Copper wires can provide higher bandwidth
C. Optical fibers suffer from interference
D. Optical fibers are widely used for backbone networks

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For Multiplexing,

A. FDM divides frequency spectrum into frequency bands B. TDM allows mutilple signals to be transmitted on C. the channel at the same time D. TDM has higher efficiency than FDM

PSTN (public switched telephone network) consists:

Quadrature Phase-shift Keying

Compare with UTP and COAX

Compare Optical fibers with copper wires

A. FDM divides frequency spectrum into frequency bands
B. TDM allows mutilple signals to be transmitted on
C. the channel at the same time
D. TDM has higher efficiency than FDM