Computer Networks

421. In the 4B/5B we need a 125MHz clock for a signal of

1. 100MHz
2. 10MHz
3. 1000MHz
4. 10000MHz

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422. In the beginning around 1980, analog cellular telephone systems were developing in

1. USA
2. UK
3. Europe
4. Japan

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423. In the case of telephone lines, the usable bandwidth falls in the range of ____________

1. 300Hz to 3000Hz
2. 300Hz to 3300Hz
3. 30Hz to 3300Hz
4. 33Hz to 3300Hz

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424. In the differential phase shift keying, For a 0 the modem shifts the phase of each succeeding signal in a certain number of degrees

1. 0
2. 45
3. 90
4. 180

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425. In the differential phase shift keying, For a 1 the modem shifts the phase of each succeeding signal and a different certain number of degrees

1. 0
2. 90
3. 180
4. 270

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426. In the Frequency Shift keying, the frequency of the carrier signal is changed according to the data

1. Modulation
2. Data
3. Signals
4. None of these

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427. In the HDLC protocol, every frame consists of ____________ with a flag

1. Starts
2. End
3. Both a & b
4. None of these

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428. In the HDLC protocol, frame consists of ____________

1. Three fields
2. Four fields
3. Five fields
4. Six fields

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429. In the Phase Shift Keying method a sine wave is transmitted and the phase of the sine wave carries the ____________

1. Analog data
2. Digital data
3. Signal data
4. None of these

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430. In TMSI nobody can determine the identity of the subscriber by listening to the

1. Video channel
2. Radio channel
3. Audio channel
4. None of these

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