North Maharashtra University 2008 B.E Computer Science and Engineering Data Communication, S.E CSE /E - Question Paper
North Maharashtra university exam May/June 2008
Subject: Data Communication
Branch: Computer science and engineering.
Year : second year (semester 4th
DATA COMMUNICATION MAY JUNE 2008
Tim* : Thx* Hour*
Max Mark* 100
Instructions to Candidates :
1. Do not write anything on question paper except beat No
2. Attempt any two questions from Each unit.
3. Figure to the right indicate full marks.
4. Draw diagram whrever Necessary.
5. Assume suitable data If Required.
UNIT - I
I. a) What are the Basic components of any communication system ? What do they do ?
5
b) What is Network ? What do you mean by open k dose Network, give one example of each ? **
2. a) Why the Networks are organued into layer ? Explain with Neat
5
diagram the protocol Hlrarchy ?
b) A signal of lOOw power, going into the channel with NoMeofl
In order to send 10,000 bits/sec How Much Bandwidth Needed
3. a) A Network with Bandwidth of 10 mbps can pass only an Avg of
12.000 frames per minute with each frame carrying an *51
10.000 bits ? What is the through put of this Network In Mbps
b) What is the propogation time If the distance between Tran*m,ttT and Receiver is 12,000 km ? Assume propogation speed to be
2.4*10*/* In cab,t?
c) What are the Design towes for the layer ? *
i
UNIT - II
5
a) Explain with th help of waveforms,
i) Unipolar
ii) Bipolar Line coding scheme
b) What is the role of Modulation ? What are the reasons of
Modulation and its Need ? What is demodulation ? 5
a) What are side Bands in AM ? What do they contain ? Also explain SSB in AM ? 5
b) An analog signal has bit rate of 8000 bps and a band rate of 1000 band. How many data elements are carried by each signal element7 How many signal elements do we need ? 5
a) To send 256 kps over a Noise less channel with bandwidth of 20 kHz, How many signal level do we need ? 3
b) Explain PM In comparison with AM ? 5
c) Explain 56k Medem ? 2
5
b) Explain the concept of Data rate Management with Neat diagram ? 5
a) Explain the following with Neat diagram.
6
b) Explain Inverse TDM with Neat diagram.
4
9. a) Explain the following.
*) Radio wvc. H) Micro wav*,
ill) Infrared.
b) What are the proportion modes of optical channel ?
UNIT - IV
10. a) Explain VRC and LRC ?
b) Explain CRC and check sum ? 5
11. a) Explain the following 8
J
i) Stop and wait il) Go Back - N
b) What are the different types of Errors ? 2
12. a) Calculate CRC checkium for the Message polynomial GM-x5**2
with generator polynomial P(x)x34-x2-fl
b) Design a digital circuit to develop a aarity bit for 4 bit U group even or odd parity can be selected by a single control line iaing
Ex - oR gate* ?
UNIT-V
8
13. a) Write short note on,
I) Repeaters 10 Bridge
ill) Router v) Gateway
v) Hub vi) Gigabit Ethernet
vll) Traditional Ethernet vill) Fast Ethernet
f-T-
7
b) Explain the following, i) X.21 ii) X.25
14. a) Explain the frame format of HDLC / SDLC protocol ?
b) Explain
i) CSMA/CD ( U) FDMA
15. a) Explain the IEEE 802.X standard ?
b) Explain CDMA ?
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