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D7093

PART D
Answer any two full questions, each carries 9 marks.

For the bit stream 11000110010,sketch the wave form for each of the code of
NRZ-I.NRZ-L, Bipolar-AMI, Pseudoternary, Manchester, Differential
Manchester.
Explain the modulation technique used in Asymmetric Digital Subscriber
Line(ADSL) and cable modems
With suitable example explain the working principle of Code division
multiplexing for CDMA technology.
Explain the frame format of Synchronous Optical Network(SONET) for the
version SDH.
State Sampling theorem. With help of suitable diagrams, explain the process of
transforming analog data in to digital signal using Pulse Code Modulation
technique.
How Time division Multiplexing (TDM) handle disparity in the input data rate, if
data rate of all input lines are not same?

PART E

Answer any four full questions, each carries 10 marks.

Explain with suitable diagram, how asynchronous and synchronous connections
are used in data communication.
Explain major types of noise occur during data transmission, which causes errors.
Why would you expect a CRC to detect more errors than a parity bit?
For P=110011 and M=11100011, Find CRC.
With suitable examples explain sliding window error control mechanism in data
communication.
Give any two reasons why baseband signal cannot be directly transmitted in a
wireless system? How Frequency Hopping Spread Spectrum(FHSS) spread the
baseband signal for transmission.
How does spread spectrum eliminates narrow band interferences? Explain Direct
Sequence Spread Spectrum(DSSS) technique.
What are the different architectural components in public communication
network? Explain its working principle.
Explain the datagram approach for packet switching network. What is the
significance of packet size in packet switching network?
Given the dataword 1001001111 and the devisor 10111,show the generation of
the CRC codeword at the sender site using binary division.

Calculate the hamming pairwise distance among following codewords;

i) 00000,10101,01010 ii) 000000,010101,101010,110110

List four major components of packet switch and write their function

With suitable example illustrate working of virtual circuit approach for packet

switching
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