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SPPU Electronics and Telecom Engineering (Semester 8)
Telecommunication & Switching System
June 2015
Telecommunication & Switching System
June 2015
Answer any one question from Q1 and Q2
1 (a)
Discuss the various types of switching systems.
8 M
1 (b)
Explain operation of Memory controlled time division switching with a neat block diagram.
8 M
2 (a)
Explain space division switching & time division switching.
8 M
2 (b)
What are the functions of switching Systems? Draw block diagram of Subscriber's line interface circuit for a digital exchange.
8 M
Answer any one question from Q3 and Q4
3 (a)
Explain the terms
i) Erlang
ii) Busy Hour
iii) BHCR
iv) CCR
i) Erlang
ii) Busy Hour
iii) BHCR
iv) CCR
8 M
3 (b)
Derive and explain 'Erlang's lost-call formula' with necessary assumptions.
8 M
4 (a)
Explain the following in detail:
i) GOS
ii) Blocking Probability
iii) Markov Chain
i) GOS
ii) Blocking Probability
iii) Markov Chain
8 M
4 (b)
State and explain 'Constant' and 'Exponential' Holding time Distributions.
8 M
Answer any one question from Q5 and Q6
5 (a)
For an ideal Grading, state and explain the 'Erlang's grading formula'.
4 M
5 (b)
Explain the Skipped Grading and Homogeneous Grading. Draw neat diagrams.
6 M
5 (c)
What are different levels of control functions in a distributed SPC? Explain operations of each level in detail.
8 M
6 (a)
Define Signalling. Write classification of signalling.
6 M
6 (b)
Design a three stage network that has 100 incoming lines and 300 outgoing trunks. Also calculate the total cross points.
6 M
6 (c)
Define and explain the terms 'Availability' and 'Unavailability' of a dual processor system with necessary equations.
6 M
Answer any one question from Q7 and Q8
7 (a)
Draw and explain with block schematic for connections between two autonomously timed digital switches. What are Slips? How they are controlled?
8 M
7 (b)
Draw and explain with block diagram for interface between TDM transmission link and a digital switch using Elastic Store.
8 M
8 (a)
State and explain in detail various Signal units based on High-level Data-Link Control (HDLC) protocol.
8 M
8 (b)
What is Timing Jitter? Draw and explain block schematic diagrams for measuring Timing Jitter.
8 M
Answer any one question from Q9 and Q10
9 (a)
Explain ISO-OSI model in detail.
8 M
9 (b)
Explain use of digital technology in Public telecommunication networks.
8 M
10 (a)
Explain the concept of Inter-networking.
8 M
10 (b)
Discuss various types of services provided by ISDN.
8 M
Answer any one question from Q11 and Q12
11 (a)
Write short note on CDMA IS-95 Technology.
6 M
11 (b)
Explain the concepts of Roaming and Handoff.
6 M
11 (c)
Explain the basic components of Cellular system.
6 M
Write short note on (any three):
12 (a)
Cellular system topology.
6 M
12 (b)
GPRS
6 M
12 (c)
Personal Satellite communication system
6 M
12 (d)
GSM System Architecture
6 M
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