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SPPU Electronics and Telecom Engineering (Semester 8)
Telecommunication & Switching System
December 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any one question from Q1 and Q2
1 (a) Explain the various functions of a switching system with a detailed trunking diagram and state the advantages of digital switching.
10 M
1 (b) Explain operation of Input controlled time division space switching with a neat block diagram.
8 M

2 (a) State and explain issues of Digital switching in an analog environment.
8 M
2 (b) Write a brief note on two dimensional switching. Draw the block diagram for a TS Switch and explain various functional entities.
10 M

Answer any one question from Q3 and Q4
3 (a) Define with suitable expressions the following in case of a Queue system with a single server having FIFO discipline.
i) Probability of Delay.
ii) Mean length of the queue.
iii) Mean Delay, when there is delay.
iv) Mean Delay, averaged over all time.
8 M
3 (b) State and explain formula for the grade of Service of loss systems in tandem and 'Erlang C' formula.
8 M

4 (a) State and explain 'Erlang Delay formula'. Explain its application to Circuit and Packet switches.
8 M
4 (b) Explain how the End to End Blocking Probabilities in a large network are calculated with assumptions and sources of error.
8 M

Answer any one question from Q5 and Q6
5 (a) Define Graded Groups. Explain the procedure for designing grading to provide access to 'N' trunks from switches with availability 'k'. Which is the best grading?
8 M
5 (b) Explain the design procedure for 'N' by 'N' switch with two stages and no. of links = N. What is the total no. of cross-points required?
8 M

6 (a) Explain in detail the sequence of operations involved in a telephone call.
8 M
6 (b) Draw and explain block schematic diagram of CCITT signalling system No. 7.
8 M

Answer any one question from Q7 and Q8
7 (a) Describe in brief about different types of Jitter and explain how elastic store is used to remove the accumulated Jitter with a neat diagram.
8 M
7 (b) Explain the need of synchronization in a network containing digital switching systems.
8 M

8 (a) What is network synchronization and enlist the basic approaches of network synchronization.
8 M
8 (b) Explain the methods related to flow control in Network management.
8 M

Answer any one question from Q9 and Q10
9 (a) Explain the data Transmission in PSTN with the help of a diagram.
8 M
9 (b) Explain the different classes of Routing algorithms and measures to asses performance of a Routing Algorithm.
8 M

10 (a) Explain the Inter-networking Structures for the repeater, bridge, router and gateway with the help of an ISO-OSI reference model.
8 M
10 (b) Explain Numbering and Addressing in ISDN.
8 M

Answer any one question from Q11 and Q12
11 (a) Explain the terms:
i) Micro cells and pico cells.
ii) Sectoring.
iii) Co-channel interference.
iv) Soft and hard hand-off.
v) Dualization.
10 M
11 (b) Explain forward link channel structure of IS-95 air interface.
8 M

12 (a) Draw block diagram for the GSM system architecture and explain various functional entities.
10 M
12 (b) Justify whether CDMA is having better security than GSM or not.
8 M

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