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Posted Date: 19 Jul 2009 Posted By: guna Member Level: Gold
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2007 Andhra Pradesh State Basara University B.E Computer Science Digital Communications Question paper
Day and Date: Monday, 15-05-2006 Total Marks: 100
Time: 3.00pm to 6.00pm
Instructions: 1) Attempt any three questions from each section.
2) Figures to right indicate full marks.
SECTION-1
Q.1. a) Explain different transmission impairments that limits communication system Performa Nance.[Marks 10]
b) Compare analog and digital data transmission.[Marks 8]
Q.2. a) what is the difference between unshielded twisted pair and shielded twisted pair? [Marks 8]
b) Explain optic fiber cable in detail.[Marks 8]
Q.3 a) what is DCE? And what is its function?[Marks 8]
b) Explain delta modulation technique.[Marks 8]
Q.4 a) Explain the differences between NRZ-L and NRZ-I.[Marks 8]
b) What are the major disadvantages of asynchronous transmission?[Marks 8]
Q.5 a) How is synchronization is provided for synchronous transmission? [Marks 8]
b) Explain circuit switching concepts.[Marks 8]
SECTION-1
Q.6. Compare OSI and TCP/IP reference model.[Marks 16]
Q.7. Explain n the functions of Presentation Layer and Application Layer of OSI reference model.
[16]
Q.8 Write a short notes on any three:[Marks 18=6*3]
a) LAN
b) MAN
c) Interfaces and services
Q.9. a) Explain different services provided by data link layer to network layer.[Marks 8]
b) What is the need of flow control? [Marks 8]
Q.10.a) Describe-serial IP in detail.[Marks 8]
b) Explain the Data Link Layer in the Internet.[Marks 8]
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