Data Communication and Computer Networks - Data Communication
- Option : B
- Explanation : TSI (Time Slot Interchanger) in time division switches consists of random access memory (RAM) with several memory locations. The RAM ills up with incoming data from the time slots in the order received. Hence in time division switches deliver of data is delayed because data must be stored and retrieved from RAM.
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- Option : B
- Explanation : If 1st router connect with other 4 routers then total for 1st=4 same as 2nd router connect with 3 routers so total for 2nd=3 same as for 3rd router connect with 2 routers so total =2 same as 4th router with 1 so total=1 so total simplex lines will be = 4+3+2+1=10. So answer is 'B'.
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28. To interface a computer terminal with a modem, required physical layer standard is
- Option : D
- Explanation :
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- Option : C
- Explanation : Propagation speed in the cable = 200,000 km/sec = 200 km/psec. Hence 100 km cable will be filled in 500 psec. This corresponds to four 193-bit frames, or 772 bits on the cable.
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30. How much bandwith is there in 0.1 micron of spectrum at a wavelength of 1 micron ?
- Option : C
- Explanation : Given :∆ λ= 10-6, and  λ= 10-6
∆f = (c∆λ)/λ2=30,000 GHz
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