 MORE IN Telecommunication & Switching System
SPPU Electronics and Telecom Engineering (Semester 8)
Telecommunication & Switching System
June 2015
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) 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
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
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

More question papers from Telecommunication & Switching System