题目内容

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 Shannon's Theorem:

A. It does not consider noise on the channel
B. It is more accurate more the Nyquist's Therom
C. it uses signal-to-noise ratio
D. It can only be applied on copper wires

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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

Quadrature Phase-shift Keying

Compare with UTP and COAX

Compare Optical fibers with copper wires

For Shannon's Theorem:

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