JNTU Kakinada B-Tech 3-1 RT31052 I DATA COMMUNICATION R13 April 2018 Question Paper

|”|”|||”|”’|||’|
Code No: RT31052
III B. Tech I Semester Supplementary Examinations, May- 2018
DATA COMMUNICATION (Common to Computer Science Engineering and Information Technology)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B)2. Answering the question in Part-A is compulsory
3. Answer any THREE Questions from Part-B
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PART ?A
1 a) Define data communication. What are the elements of data communication? [3M]
b) What is Optical fiber? What are the disadvantages of Optical Fiber Cables? [4M]
c) Give the concept of delta modulation. [4M]
d) What is Skip Distance? [3M]
e) What is Global system for Mobile Communications? [4M]
f) Distinguish between synchronous and Asynchronous Voice-Band Modems. [4M]
PART -B
2 a) With neat sketch explain the layered network structure. [4M]
b) Explain about Serial and parallel Data Transmission. [8M]
c) Define i) Information Capacity and ii) Bit rate
[4M]
3 a) Write about the two commonly used fiber types due to variations in the Material
Composition.
[3M]
b) Derive the Expression for quantum efficiency and optical power emitted from the
LED.
[8M]
c) Derive the general equation of coupling loss in single mode fiber connectors.
[5M]
4 a) Explain in detail about the operation of PCM transmitter and receiver. [8M]
b) Discuss about Digital Line Encoding in detail.
[8M]
5 a) Explain the Microwave communication system with neat block diagram. [8M]
b) Derive the expression for Free-Space Path Loss.
[8M]
6 a) Explain the Basic Telephone Call Procedures. [8M]
b) Describe the digital cellular mobile systems and the limitations of AMPS standard.
[8M]
7 a) What are the different methods of error detection and explain any two methods. [8M]
b) Write short notes on Voice- Band Data Communication Modems. [8M]
*****
R13
SET – 1