Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 6th Sem New 2161103 Telecommunication Switching Systems And Networks Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2161103 Date:16/05/2019
Subject Name:Telecommunication Switching systems and Networks
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
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
Q.2 (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
OR
(c) Explain Clos Network in detail. 07
Q.3 (a) Explain interrupt processing function of control subsystem in exchange. 03
(b) Compare: Micro-programmed control vs. Hard-wired control 04
(c) Discuss basic time division space switching with necessary switch
configurations
07
OR
Q.3 (a) 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
(b) Compare Inchannel and Common Channel Signaling 04
(c) Discuss Markov and Birth-death processes in detail. 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 and CM.
03
(b) Compare Satellite and Terrestial Communication 04
(c) Discuss network architecture of ISDN. 07
OR
Q.4 (a) An exchange serves 5000 subscribers. If the average BHCA is 20,000
and the CCR is 50%, calculate the busy hour calling rate.
03
(b) Discuss about various diversity schemes in communication system. 04
(c) Which factors limits the subscriber loop length? Explain in brief how to
overcome this limitations
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VI(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2161103 Date:16/05/2019
Subject Name:Telecommunication Switching systems and Networks
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
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
Q.2 (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
OR
(c) Explain Clos Network in detail. 07
Q.3 (a) Explain interrupt processing function of control subsystem in exchange. 03
(b) Compare: Micro-programmed control vs. Hard-wired control 04
(c) Discuss basic time division space switching with necessary switch
configurations
07
OR
Q.3 (a) 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
(b) Compare Inchannel and Common Channel Signaling 04
(c) Discuss Markov and Birth-death processes in detail. 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 and CM.
03
(b) Compare Satellite and Terrestial Communication 04
(c) Discuss network architecture of ISDN. 07
OR
Q.4 (a) An exchange serves 5000 subscribers. If the average BHCA is 20,000
and the CCR is 50%, calculate the busy hour calling rate.
03
(b) Discuss about various diversity schemes in communication system. 04
(c) Which factors limits the subscriber loop length? Explain in brief how to
overcome this limitations
07
2
Q.5 (a) Define connection oriented and connection less protocol. 03
(b) Write a Short note on EPABX 04
(c) With reference to data networks, explain with flow chart the operation
of simple ARQ Protocol.
07
OR
Q.5 (a) Compare Circuit switching vs. Packet switching 03
(b) Draw the flow chart for p-persistence CSMA protocol 04
(c) Explain Briefly layered architecture of OSI model. 07
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This post was last modified on 20 February 2020