dccQnpaper.docx

7/27/2019 dccQnpaper.docx

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dcc-dec 2010

SQ:

1.discuss about types of noise with respect to data transmission

2. Most of the telecommunication facilities have moved to digital transmission. Give reason

3. Differentiate b/w bit and character oriented synchronous transmission

4. Explain briefly how CDMA is applied to Dirrect sequence spread spectrum

5. Write short notes on CSMA/CD

6. List out common design issues of CDMA scheme

7. Draw a neat diagram of IPV6 packet with extension headers

8. List the benefits of IP Sec

Essay Qn:

1. (a) (i) Explain in detail about nyquist and Shannon formulation on band width and data rate.(12 mrk)

(ii) Consider a spectrum of channel b/w 5MHz and 7MHz and SNRdb =22dB. Find the

maximum channel capacity using Shannon for mulation and based on it find the number of

signal level using Nyquists formula. (3mrks)

(b) (i) Draw a neat diagram to show the electromagnetic spectrum for telecommunication (7mrk)

(ii) Explain in detain about PCM

2. (a) (i) Differentiate Synchronous TDM and statistical TDM(3 mrk)(ii) Explain the working of statistical multiplexing (12 mrk)

(b) Consider 11110000as the message and 10011 as the polynomial. Explain in detail about

frame check sequence generation and checking process. (12 mrk)

3. (a)Explain in detail about FDDI (15)

or

(b) (i) What is the concept of frequency reuse in cellular networks? (4mrks)


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1. Define and explain channel capacity. Derive an epression for channel capacity2. Explain the concept of PSDN with neat sketch3. What are FEC and ARQ scheme ?Explain and differentiate them4. Differentiate FH spread spectrum from DS spread spectrum5. Explain the advantage of Ethernet switching6. Explain the advantages of asynchronous transfer mode7. Explain the outline architecture of Internet working8. Explain the salient feature of network security

Essay Qn:-

1. (i) Differentiate signal encoding from signal decoding. Explain (7)(ii) Differentiate ISDN from PSDN (8)

Or

Describe in detail the error detecting and Error correcting code capabilities with

example(15)

2. Explain in detail the functions of multi-service networksOr

i. Discuss in detail about ADSL and XDSL (7)ii. Explain the principle of spread spectrum technique with neat sketches (8)

3. (i) Explain in detail the functions of High speed LAN and FDDIiii. Give an account on cellular wireless network (7+8)

Or

i. Differentiate wire LAN from wireless LANii. Differentiate and explain circuit switching and packet switching( 7+8)

4. Explain the routine and congest control in switched data networks


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Or

Write a technical note on application support Protocol

DCC Dec 2007SQ:-

1. What is meant by signal encoding? Explain its significance2. Explain the advantage and importance of broadband networks3. What are the types of spread spectrum techniques? Explain the applications of spread

spectrum?

4. Define and explain CDMA and its types5. Give an account on wired LAMN6. Differentiate circuit switching from packet switching7. Explain the protocol standards of Internet8. Explain the significance of network security

Essay Qn:-

1. (i) Differentiate ISDN from PSDN(ii)Explain the functions of multi-sevice networks(7+8)

Or

i. Define aand explain channel capacityii. Derive an expression for channel capacity(7+8)

2. (i) Give an account on hamming code(ii)Explain the advantages and application of CDMA(7+8)

Or


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i. Explain the concept of TPM. Explain the principle of TDM with a neatdiagram

ii. Give an account on XDSL (7+8)3. Explain in detail the principles of routine and congestion control in switched data

networks

Or

Write notes on:

i. Wireless LANsii. Ethernet switching(7+8)

4. Describe in detail the following:-i. Application support protocol (7)ii. High speed LANs (8)

Or

Describe in detail the architecture of Internet Working (15)


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DCC Dec 2009

SQ:-

1. Write in short about PSDN2. For a QPSK modulator with an input data rate equal to 10Mbps and carrier frequency of 70 Mhz.

Determine the minimum double sided nyquist bandwidth and the Band

3. Write a short note on discrete multitone4. Define the following terms with respect to error detection:

i. Forward error controlii. Feedback error controliii. Bit error rateiv. Hamming distancev. Burst error

5. Draw a flowchart to show token ring MAC sublayer operation6. Compare circuit switching and packet switching7. Discuss about Jacobsons algorithm8. Write in short about Kerboros system

Essay Questions:-


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1. Draw a block diagram of a QPSK transmitter and explain in detail. Derive the bandwidthrequired for a QPSK system (15)

Or

i. With the block diagram explain binary PSK(7)ii. Define the probability of error function and Pe inbinary PSK(5)iii. Draw the waveform of ASK,FSK,PSK(3)

2. Explain the following mechanism:i. Stop and Wait flow controlii. Stop and wait ARQ (8+7)

Or

A series of 2000-bit frame is to be transmitted across a data link 500km in length at 20Mbps. If

the link has a velocity of propogation of 4 x 108

ms-1

and BER of 4 x 10-5

, determine the link utilization

using the following link protocols:

i. Idle RQii. Selective repeat and send window 10iii. Go-back-N and a send window 10 (15)

3. (i) Draw the frame format of ATM, UNI and NNIiii. Explain in detail about various ATM service categories (5+10)

Or

i. Explain in detail about fixed routing and adaptive routiningii. Explain in detail about x.25iii. Explain in detail about x.25 (8+7)

4. (i) Explain in detail about SHA(ii)Write shorts note on public key encryption (8+7)

Or

Explain in deail about session layer (15)


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