题目内容

For switching

A. Packet swiching is more reliable than circuit swiching
B. Circuit swiching requires path setup in advance
C. Packet swich is more likely to waste bandwidth
D. Packet swiching is less efficient than circuit swiching

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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

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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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For switching

A. Packet swiching is more reliable than circuit swiching B. Circuit swiching requires path setup in advance C. Packet swich is more likely to waste bandwidth D. Packet swiching is less efficient than circuit swiching

For Multiplexing,

PSTN (public switched telephone network) consists:

Quadrature Phase-shift Keying

Compare with UTP and COAX

A. Packet swiching is more reliable than circuit swiching
B. Circuit swiching requires path setup in advance
C. Packet swich is more likely to waste bandwidth
D. Packet swiching is less efficient than circuit swiching