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Posted Date: 01 May 2009 Posted By: Sunil Reddy Member Level: Platinum
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2007 Jawaharlal Nehru Technological University Electronics & Communications Engineering III B.Tech. I-Semester Examinations , August 2007 DATA COMMUNICATIONS Question paper
1. What are the various types of data communication lines? Discuss their merits and demerits.
2.a) What is FSK? Explain
b) Compare Rs 232 C and RS 449 data standards
c) What is an X.25 ?
3. What are the different modulation methods employed in modems and explain them
4.a) Draw and explain the sequence diagram for four wire point-to-point line and multipoint line for half and full duplex protocol and explain their functions.
b) Describe a method to derive the clock signal for synchronization from the received waveforms.
5. What are the different error deflection methods? Explain how these errors can be corrected using Hamming code.
6.a) Briefly discuss about code devices
a. What is the structure of a frame?
7.a) Give the structure and format of bisync protocols
b) Give the different network configurations with the help of diagrams. Discuss their functions.
8. Write short notes on the following
a) Statistical multiplexer
b) 16 QAM
c) Intelligent Modern and hybrid data
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