GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VI (NEW) EXAMINATION - WINTER 2020
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Subject Code:2161103 Date:27/01/2021Subject Name:Telecommunication Switching systems and Networks
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain Birth-Death process. [03]
(b) Describe the terms of GOS (Grade of Service) and blocking probability. [04]
(c) Define the following terms. [07]
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(i) Trunks (ii) Side tone (iii) ISDN (iv) Grade of service (v) DHCA (vi) Erlang (vii) centum call second.Q.2 (a) Compare Strowger switching system and crossbar switching system. [03]
(b) Compare Ring and Star Topology. [04]
(c) Explain different signaling techniques in telecommunication network. [07]
Q.3 (a) Compare circuit switching and Packet switching. [03]
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(b) Explain Concept of Cellular Mobile Telephony. [04](c) Explain Enhanced service of stored program control. [07]
Q.4 (a) Discuss Markov Process in brief. [03]
(b) Compare: Micro-programmed control vs. Hard-wired control. [04]
(c) Explain basic Time division time switching in detail with necessary diagram. [07]
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Q.5 (a) Compare Analog and Digital Telecommunication. [03]
(b) Explain the steps involved in conference calling among 3 users with block diagram. [04]
(c) Describe Distributed Store Programmed Control switching with Level-1, Level-2 and Level-3 processing. [07]
Q.6 (a) Explain Rotary Switch in Brief. [03]
(b) Draw and explain simplex and half-duplex telephone circuits with necessary equations. [04]
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(c) Explain Time-Space(TS) and Space Time (ST) combinational switching system. [07]Q.7 (a) Briefly describe Common Channel Signaling. [03]
(b) Explain the load sharing mode of centralized SPC. [04]
(c) Explain (1) Space Diversity (2) Frequency Diversity (3) Polarization Diversity. [07]
Q.8 (a) Discuss SS7 architecture in brief. [03]
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(b) Derive the blocking probability for Lost Call Cleared [LCC] system for infinite sources. [04](c) Explain ISDN. [07]
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