Subject Code: 216103
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-VI (NEW) — EXAMINATION — SUMMER 2019
Subject Name: Telecommunication Switching Systems and Networks
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define (1) Erlang (2) Transit Exchange (3) Grade of service [03]
(b) Draw and explain simplex and half-duplex telephone circuits with necessary equations. [04]
(c) Explain elements of switching system with diagram. [07]
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OR
Q.1 (a) For a network with point to point link, calculate number of links (L) required connecting 50 nodes? [03]
(b) Given that MTBF= 3000 hours and MTTR = 5 hours. Calculate the unavailability for single and dual processor systems. [04]
(c) Explain two stage blocking network and derive the equation for blocking probability. [07]
Q.2 (a) Explain Clos Network in detail. [07]
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(b) Explain interrupt processing function of control subsystem in exchange. [03]
(c) Compare: Micro-programmed control vs. Hard-wired control [04]
OR
Q.2 (a) Discuss basic time division space switching with necessary switch configurations [07]
(b) A central battery exchange is powered with 48 V batteries. The carbon microphone requires a minimum of 24mA as energizing current. The battery has a 400 ohms resistance in series for short circuit protection. The d.c. resistance of microphone is 50 ohm. If the cable used for subscriber lines offer ‘a) resistance of 50 ohms/km, determine the maximum distance at which a subscriber station can be located. [03]
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(c) Compare Inchannel and Common Channel Signaling [04]
Q.3 (a) Discuss Markov and Birth-death processes in detail. [07]
(b) 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 and CM. [03]
(c) Compare Satellite and Terrestrial Communication [04]
OR
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Q.3 (a) Discuss network architecture of ISDN. [07]
(b) An exchange serves 5000 subscribers. If the average BHCA is 20,000 and the CCR is 50%, calculate the busy hour calling rate. [03]
(c) Discuss about various diversity schemes in communication system. [04]
Q.4 (a) Which factors limits the subscriber loop length? Explain in brief how to overcome this limitations [07]
(b) Define connection oriented and connection less protocol. [03]
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(c) Write a Short note on EPABX [04]
OR
Q.4 (a) With reference to data networks, explain with flow chart the operation of simple ARQ Protocol. [07]
(b) Compare Circuit switching vs. Packet switching [03]
(c) Draw the flow chart for p-persistence CSMA protocol [04]
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Q.5 (a) Explain Briefly layered architecture of OSI model. [07]
(b) N/A [03]
(c) N/A [04]
OR
Q.5 (a) N/A [07]
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(b) N/A [03]
(c) N/A [04]
Date: 16/05/2019
Total Marks: 70
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This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University
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