Rajiv Gandhi Proudyogiki Vishwavidyalaya 2010-5th Sem B.E Computer Science and Engineering (ester) ,e - Question Paper

B.E.(Fifth Semester) Examination,June,,2010
DATA COMMUNICATION
CS-501
Time-3 hours Total marks-100

Attempt any 5 ques.. All ques. carry equal marks.

1(a)Explain the basic components of data communication and their characteristics.
(b)Write a brief note on serial and parallel transmission giving suitable example.
2(a)Describe the concept of switching and contrast circuit switching and packet switching.
(b)Explain in brief the operation of time division multiplexing.
(c)What signal-to-noise ratio is needed to put a t1 carrier on 50 kHz line?
3(a)Suppose that x bits of user data are to be transitted over a k-hop path
in a packet switched networks as a series of packets, every containing p
data bits and h header bits ,with x>p+h. The bit rate of the lines is bbps
and propagation delay is negligible. What value of p minimizes the total
delay.
(b)Explain QAM modulator in brief.
(c)Write a brief note on Nyquist theorem.
4(a)Describe the function of Null Modem.
(b)What is bridge? define how to LANs subsequent
Two various protocols can be connected using a bridge.
5(a) What is ISDN? discuss in detail.
(b)Explain the subsequent components of baseband LANs:
(1)Network Interface Card (2)Repeaters
6(a)Explain the various kinds of Guided Media with example.
(b)Explain the characteristics of transmission line.
7(a)Describe the different fault detection method.
(b)Assume the CRC generator polynomial of
x5 + x4 + x2 + one is used to give fault checking .
calculate the bit stream that will be transmitted
If a 111000111000 is sent.
8(a)Write short notes on following-
(1)Network topology
(2)Fax Modems
(3)Data compression devices
(4)Hamming code
(5)Transmission media.

Earning:   Approval pending.