Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem New 2161103 Telecommunication Switching Systems And Networks Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2161103 Date:27/11/2018
Subject Name:Telecommunication Switching systems and Networks
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) A fully connected network supports full duplex communication using
unidirectional links. Show that the total number of links in such a network with
n node, is given by 2 *
n
C2.
03
(b) Explain side tone coupling circuit and it?s importance in telephone. 04
(c) Discuss briefly about single termination and multi termination switch board in
telecommunication.
07
Q.2 (a) Discuss briefly about cross point matrix and it?s importance in connection
making between called and calling user in telephone system.
03
(b) Explain the working of Touch-tone dialing keypad in telephone. 04
(c) Explain briefly the concept of Common Control Switching (CCS) in
telecommunication
07
OR
(c) Explain Crossbar switching matrix in detail with block diagram. 07
Q.3 (a) State the difference between Microprogrammed and Hard-wired control
scheme in telephone switching.
03
(b) Derive the formula for availability and non-availability of processor in single
and dual processor case.
04
(c) Discuss centralized Stored Programmed Control (SPC) with standby,
Synchronous duplex and load sharing mode of dual processor.
07
OR
Q.3 (a) State the difference between single stage and multi-stage network. 03
(b) Discuss two stage space switching network with block diagram, number of
total switching elements and switching capacity.
04
(c) Describe briefly about distributed SPC with the Level-1, Level-2 and Level-3
processing and their individual functionality assigned.
07
Q.4 (a) A subscriber makes three phone calls of 3 minutes, 4 minutes and 2 minutes
duration in a one-hour period. Calculate the subscriber traffic in Erlangs, CCS
(Centum Call second) and CM (call minutes).
03
(b) Discuss Time-multiplexed space switching with proper diagram. 04
(c) State the difference between Markov process, Birth-Death process and
Poisson process with proper insight and examples.
07
OR
Q.4 (a) Over a 20 minute observation interval, 40 subscribers initiate calls. Total
duration of the calls is 4800 seconds. Calculate the load offered to the network
by the subscribers and the average subscriber traffic.
03
(b) Explain combinational switching with two-stage Time-Space (TS) switching
concept.
04
(c) Derive the formula to find the blocking probability for lost call cleared system
with infinite sources.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI (NEW) EXAMINATION ? WINTER 2018
Subject Code:2161103 Date:27/11/2018
Subject Name:Telecommunication Switching systems and Networks
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) A fully connected network supports full duplex communication using
unidirectional links. Show that the total number of links in such a network with
n node, is given by 2 *
n
C2.
03
(b) Explain side tone coupling circuit and it?s importance in telephone. 04
(c) Discuss briefly about single termination and multi termination switch board in
telecommunication.
07
Q.2 (a) Discuss briefly about cross point matrix and it?s importance in connection
making between called and calling user in telephone system.
03
(b) Explain the working of Touch-tone dialing keypad in telephone. 04
(c) Explain briefly the concept of Common Control Switching (CCS) in
telecommunication
07
OR
(c) Explain Crossbar switching matrix in detail with block diagram. 07
Q.3 (a) State the difference between Microprogrammed and Hard-wired control
scheme in telephone switching.
03
(b) Derive the formula for availability and non-availability of processor in single
and dual processor case.
04
(c) Discuss centralized Stored Programmed Control (SPC) with standby,
Synchronous duplex and load sharing mode of dual processor.
07
OR
Q.3 (a) State the difference between single stage and multi-stage network. 03
(b) Discuss two stage space switching network with block diagram, number of
total switching elements and switching capacity.
04
(c) Describe briefly about distributed SPC with the Level-1, Level-2 and Level-3
processing and their individual functionality assigned.
07
Q.4 (a) A subscriber makes three phone calls of 3 minutes, 4 minutes and 2 minutes
duration in a one-hour period. Calculate the subscriber traffic in Erlangs, CCS
(Centum Call second) and CM (call minutes).
03
(b) Discuss Time-multiplexed space switching with proper diagram. 04
(c) State the difference between Markov process, Birth-Death process and
Poisson process with proper insight and examples.
07
OR
Q.4 (a) Over a 20 minute observation interval, 40 subscribers initiate calls. Total
duration of the calls is 4800 seconds. Calculate the load offered to the network
by the subscribers and the average subscriber traffic.
03
(b) Explain combinational switching with two-stage Time-Space (TS) switching
concept.
04
(c) Derive the formula to find the blocking probability for lost call cleared system
with infinite sources.
07
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2
Q.5 (a) State the difference between In-channel and Common Channel Signaling. 03
(b) Discuss briefly about circuit switching in telecommunication. 04
(c) Shed the light on data transmission in Public Switching Telephone Network
(PSTN).
07
OR
Q.5 (a) Discuss about Local Area Network (LAN) and it?s various topologies. 03
(b) Describe Packet Switching in telecommunication in brief. 04
(c) Explain in depth about various modes of communication at present. 07
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This post was last modified on 20 February 2020