TED (10) -3067

(REVTSTON - 2010)

Reg. No.

Signature

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THIRD SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/TECHNOLOGY - OCTOBER, 2016

DATA COMMUNICATION(Common for CM, CT & IF)

lTime :3 hours

(Maximum marks : 100)

PART - A

(Maximum marks : l0)

Marks

I Answer c// questions in one or two sentences. Each question carries 2 marks.

. l. Define LAN and WAN.

2. Compare guided and unguided fransmission media.

3. What is meant by flow control ?

4. Define cipher text.

5. Explain the term 'protocol' in data communication. (5x2=10)

PART - B

(Maximum marks : 30)

II Answer any .five of the following questions. Each question carries 6 marks.

l. Explain the different components of data communication.

2. With a neat sketch, explain delta modulation.

3. Explain Manchester and differential Manchester encoding techniques.

4. Explain frequency dMsion multiplexing

5. Explain about HDLC.

6. Explain different types of noises in data lransmission.

7. Write notes on transposition cipher. (5x6=30)

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III

IV

PART - C

frVlaximum marks : 60)

(Answer one full question from each rurit. Each full question carries 15 marks')

UNrr - I

Explain ISO-OSI layered architecture with figurc'

(a) Explain about network topologies.

(b) Write short notes on attenuation and delay distortion'

Marks

15

10

5

UNrr - II

(a) Explain the different digital modulation techniques :

(b) Explain the physical description of twisted pair and

a neat diagam.

On

Explain about the following wireless commturication'

(D radio wave (iD microwave (iii) sattellite

UNrr - III

(a) Explain different flow control techniques

(b) Distinguish between synchronous and asynchronous transmission.

On

(a) Explain about Go-Back-N ARQ with a diagram.

(b) Explain TDM.

Uxrr - IV

(a) Explain about RSA.

(b) Explain about circuit switching.

On

(a) Explain packet switching principles and approaches.

(b) Explain substitution cipher with the help of an example.

:ASK, FSK and PSK.

fibre optic cable with

6

9

15

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8

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