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Posted Date: 30 Aug 2008 Posted By: pradeep Member Level: Diamond
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2005 Jawaharlal Nehru Technological University III B.Tech I Semester Regular Examinations, November 2005,BASICS OF TELEMATICS Question paper
Code No: RR311702 Set No.1
III B.Tech. I Semester Regular Examinations, November -2005
BASICS OF TELEMATICS
(Electronics & Telematics)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain the problems encountered if the NRZ (Non Return Zero) waveform is
directly applied to the transmission medium? Explain the techniques to over
come them?
(b) Explain about calling mode and automatic calling units used with a modem?
[8+8]
2. (a) What are the techniques to connect a computer directly to another terminal
without a mode? Which is more preferred and why?
(b) Explain about X . 20 and X . 21 bis interface standards? [8+8]
3. Discuss about supervisory and metering circuits in an auto exchange. [16]
4. (a) Discuss the principle of synchronous Gulstand Reception in five-unit Multiplex
system.
(b) Explain the principle of Regenerative Repeater for five-unit Multiplex system.
[8+8]
5. What are the functions carried out by a router? Distinguish between hierarchical
and non -dynamic hierarchical routing techniques? [16]
6. Mention the various protocols used in Transport layer design. Explain how Trans-
port layer carries out flow control. [16]
7. (a) What are the base technologies for multiple-access? Discuss the merits and
demerits of FDMA.
(b) A voice sample takes 30KHz ,including guard band that provides protection
against small drifts in transmission frequency. How many one-way channels
can fit in 25-MHz band? If the listening area is divided in square cells, so that
no two adjacent cells that share a side use the same frequency bands, how
many calls can the 25-MHz spectrum support in a city of 250 cells? [10+6]
8. Distinguish the following terms:
(a) Topology dissemination
(b) sequence numbers- wrapped sequence number
(c) lollipop sequence to the link state routing.
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