GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018
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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:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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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 * nC2. (03)
(b) Explain side tone coupling circuit and it’s importance in telephone. (04)
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(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)
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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)
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(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)
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(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)
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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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Q.5
(a) Discuss briefly about circuit switching in telecommunication. (03)
(b) Shed the light on data transmission in Public Switching Telephone Network (PSTN). (07)
OR
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(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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