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Posted By: sunil Member Level: Diamond Posted Date: 23 Jun 2008
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2008 Jawaharlal Nehru Technological University Electronics & Communications Engineering III B.Tech II Semester Regular Examinations, Apr/May 2008 TELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS Question paper
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Code No: R05320401
Set No. 2
III B.Tech II Semester Regular Examinations, Apr/May 2008
TELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS
( Common to Electronics & Communication Engineering and Electronics &
Telematics)
Time: 3 hours
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
Max Marks: 80
1. (a) Compare the features of single stage and multistage switching network con-
?gurations?
(b) A fully connected network supports full duplex communication using unidi-
rectional links. Show that the total number of links in such a network with n
nodes, is given by 2×nC2.
[8+8]
2. (a) De?ne each of the following terms: program, procedure, processor, process,
user, task, job and subroutine.
(b) Find the blocking probability of a three stage network for M=N=2048,p=q=16
and a = 0.1 for S= 16, 24 and 32.
[8+8]
3. (a) What are the major components of telecommunication network? Explain in
detail about subscriber loop systems.
(b) An exchange uses a -40 V battery to derive subscriber lines. A resistance
of 250O is placed in series with the battery to protect it from short circuits.
The subscribers are required to use a standard telephone set which o?ers a
d.c. resistance of 50O. The microphone requires 23mA for proper functioning.
Determine the farthest distance from the exchange at which a subscriber can
be located if 26 AWG conductor is used.
[8+8]
4. (a) What are the di?erent types of busy hours de?ned by CCITT? Explain.
(b) In a group of 10 servers, each is occupied for 30 minutes in an observation
interval of two hours. Calculate the tra?c carried by the group.
[8+8]
5. (a) Explain the functions and features of data communication network compo-
nents.
(b) Discuss peer to peer client / server networks.
[8+8]
6. (a) Compare and contrast standard Ethernet, Fast Ethernet and Gigabit Ether-
net.
(b) What is looping problem in transparent Bridges? How is it avoided using
spanning tree algorithm
7. (a) Compare HDLC and LAPD protocols.
[8+8]
(b) Describe ISDN, functional architecture and standards of ISDN Channels. [6+10]
8. (a) Explain the operation of cable modem
1 of 2
Code No: R05320401
(b) Discuss features of HFC Networks.
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