Code No.: 421202 IV-B.Tech. II-Semester Examinations April 2003 TELEMATICS (Computer Science and Information Technology)
Max. Marks: 80 Answer any five questions All questions carry equal marks ---
1.a) b)
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Time: 3 Hours
Explain the terms traffic load and service grade generally used with respect to telephone system. What is a subscriber loop? What are the limitations of stronger switching system. Explain briefly the five basic functions supported by email system Explain briefly about simple mail transfer protocol.
3.a)
Distinguish between JPEG and MPEG standards and explain how synchronism is achieved between audio and video streams in MPEG1 Give a connection less datagram model of internet and briefly explain strategy adopted.
b)
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2.a) b)
Explain briefly the asynchronous Transmission mode of ATM network Briefly explain about generic ATM switch.
5.a) b)
What are the different internetworking functions? Briefly explain. What is meant by scrambling? Explain briefly about scrambling techniques generally used.
6.a)
It is clear that bit stuffing is needed for user data fields in LAPD frames, since we wish to accommodate arbitrary user data. Is it needed for the other feildds? Specify. Explain how hamming code is used to correct burst errors.
b)
What is a virtual circuit and datagram. Compare datagram and virtual circuits subnets. Explain briefly about the services provided to the transport layer.
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7.a)
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4.a) b)
b)
Write short notes on Switching matrics. Firewalls. User-network interface configuration.
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8. a) b) c)
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Set No
2
Code No.: 421202 IV- B.Tech. II-Semester Examinations April 2003 TELEMATICS (Computer Science and Information Technology)
Max. Marks: 80 Answer any five questions All questions carry equal marks ---
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Time: 3 Hours
Explain briefly a simple exchange operated by a human operator. Illustrate the principle of crossbar switch and explain its importance in telephone exchange.
2.a) b)
What is PEM? Explain briefly. Explain the format for a PGP message.
3.a)
Explain the importance of decibels? With a block diagram briefly explain about the operation of JPEG in a lossy sequential mode. What is tunneling technique? Explain briefly about Internetwork routing of five networks connected by six multi protocol routers.
b)
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1.a) b)
Explain briefly the synchronous Transmission mode of ATM networks. What is the problem of crossbar switch? How it is overcome in Batches-banyan switch.
5.a) b)
What is an Interface? Explain briefly about U-Interface. What are the four key aspects of Basic user-network interface? Explain.
6.a)
With a block diagram explain conceptually the working of integrated services digital network (ISDN). What is a frame? Explain in detail about the framming methods used in data link layer.
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b)
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4.a) b)
7.a)
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b)
On what basis you group the messages. Explain different applications where these messages are employed. With a block diagram explain the architecture and modelling of basic and supplementary services.
8. a) b) c)
Write short notes on E-mail privacy. ISDN standards. LAPP. ^^^
Set No
3
Code No.: 421202
2.a) b)
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IV-B.Tech. II-Semester Examinations April 2003 TELEMATICS (Computer Science and Information Technology) Time: 3 Hours Max. Marks: 80 Answer any five questions All questions carry equal marks --1.a) What is a side tone? Give a schematic to illustrate features of modern station set and briefly explain about current and the maximum resistance allowable in baltey station. b) Briefly explain about the mechanism of stronger switch in automatic dialing system. What is the importance of email gateways? Explain the operation of PGP for sending message of plain text. Explain briefly about simple mail Transfer protocol. What are I, P, B, D frames of MPEG1-briefly explain. What is a virtual circuit? Briefly explain the model of a concatenated virtual circuits.
4.a)
What are the two common goals of ATM switches? Explain the queuing principle of ATM switch. Distinguish between virtual circuits and circuit switching.
b) 5.a) b)
What is a packet switching? How packet switching capability is integrated in to ISDN briefly explain. Explain briefly about the ISDN address structure? Suggest improvements to the bit stuffing algorithm to overcome the problem of a single bit error. Explain briefly with example how CRC code is used for computing check sum.
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6.a)
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3.a) b)
b)
Explain briefly the functions of Network layer for call control procedures. What are the three major methods by which supplementary services may be controlled in the network layer.
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7.a) b)
8. a) b) c)
Write short notes on Tele services. U-interface. Fragmentation. ^^^
Set No.
4
Code No.: 421202 IV B.Tech II-Semester Examinations April, 2003
b) 2. a) b) 3. a) b)
What is a switching matrix? How does the rectangular matrices used to provide concentration and expansion. Briefly explain the functioning of central exchange system. What is the importance of email gateways. Explain how application layer is used for transferring email messages. Explain the operation of PGP for sending messages of plain text.
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1. a)
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Time: 3 hours
TELEMATICS (Computer Science and Information Technology) Max. Marks: 80 Answer any five questions All questions carry equal marks ---
Briefly explain the multiplexing phenomina of MPEG-2 for audio and video streams. Explain the means of differences that make internet working more difficult. Briefly give the schematic of knockout switch and explain. Explain briefly about output queuing mechanism at an ATM switch.
5. a) b)
With a block diagram explain the user network interface of Broad Band ISDN. Explain the functions of control protocol and briefly indicate the Global view of protocol Architecture.
6. a) b)
Explain the control field formats of frame structure of LAPD protocol. What is meant by data transparency? Explain bit stuffing with examples.
7. a)
How many types of terminals are supported by ISDN? What are they? Briefly explain. Explain the different message formats generally used in ISDN Network layer. Briefly explain about Bearer capability information element parameter.
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b) c)
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4. a) b)
Write short notes on: a) Hierarchy of switching office. b) Fire walls c) Data compression.
7.a) What is a virtual circuit and datagram. Compare datagram and virtual circuits · subnets. b) Explain briefly about the services provided to the transport layer.
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