Gujarat University
MCA Semester IV
Networking Technologies I
Date: 17-7-99
Time: 3 hrs. Marks:50
Instructions:
1. Both the sections are compulsory.
2. Attempt both the sections in a separate answer book.
3. Right side indicates the total marks.
4. Assume suitable data wherever necessary.
Section I
Q-1 Answer the following questions:
1. State Shannon’s theorem for the maximum channel capacity. Given a channel with a maximum channel
capacity of 20 Mbps and bandwidth of 3 MHz. What is the noise ratio? [3]
2. Describe Amplitude Modulation, Frequency Modulation and Phase Modulation with suitable example.
[6]
Q-2 Answer the following questions: [8]
1. Explain TDM with suitable example.
2. For a data bit pattern 10001010111 sketch the waveform for each of the following signal encoding schemes RZ, NRZ & Manchester encoding.
OR
Q-2 Answer the following questions: [8]
1. What is communication? Explain the structure and types of communication with suitable example.
2. Explain the multiplexing & modulation of a Digital Signal.
Q-3 Answer the following questions: [8]
1. How is data transmitted asynchronously? What types of errors are encountered during such transmission?
2. Write short note on Phase Locked Loop.
OR
Q-3 Answer the following questions: [8]
1. What characteristics of a medium are important if the medium is to be used for data communications?
2. What are wave guides? Where are they used?
Section II
Q-4 Answer the following questions: [9]
1. Write a brief note on the seven layers of OSI model.
2. What does SLIC stand for? Explain BORSHT and each of its functions?
Q-5 Answer the following questions: [8]
1. Compare pulse dialing and tone dialing.
2. What is modem? What are the various functions of a transmitting modem and receiving modem?
OR
Q-5 Answer the following questions: [8]
1. Write short note on Multidrop communication
2. Explain RS-232 lines and their functions
Q-6 Write short notes on following (any two) [8]
1. Cellular Networks & Systems
2. CSMA/CD
