STUPIDSID
1(a)
Draw a neat diagram of four-wire circuit and explain its working.
10 M
1(b)
A four wire circuit has an overall loss (two-wire to wire-wire) of 1 dB and the balance return loss at each end is 6 dB. Find: i) The singing point; ii) The stability margin; iii) The attenuation of talker and listener echo.
6 M
1(c)
Write a short note on European pleisochronous digital hierarchy.
4 M
2(a)
Differentiate between message switching and circuit switching.
4 M
2(b)
Explain the functions of electronic swiching.
6 M
2(c)
With the help of neat diagram, explain the basic types of calls that are usually processed through a DSS.
10 M
3(a)
Derive the expression for second Erlang's distribution starting from basic principles.
10 M
3(b)
Define the following terms:
i) Busy hour ii) Grade of service
iii) Pure chance traffic iv) Statistical equilibrium
i) Busy hour ii) Grade of service
iii) Pure chance traffic iv) Statistical equilibrium
4 M
3(c)
On an average , one call arrives every 5 seconds. During a period of 10 seconds, what is the probability that :
i) No call arrives? ii) One call arrives?
iii) Two call arrive? iv) More than two calls arrive?
i) No call arrives? ii) One call arrives?
iii) Two call arrive? iv) More than two calls arrive?
6 M
4(a)
What is grading? Explain different types of grading.
6 M
4(b)
Derive the expression for grade of service of three stage network.
8 M
4(c)
Design a three stage network for 100 incoming trunks and 400 outgoing trunks.
6 M
5(a)
Explain S-T-S switching network with neat diagram.
6 M
5(b)
A T-S-T network has 20 incoming and 20 outgoing PCM highway, each conveys 30 channels. The required GOS is 0.01, 0.02, 0.001, 0.005. Find the traffic capacity of network in mode 1 and mode 2.
8 M
5(c)
Explain the need for frame alignment in time division switching network.
6 M
6(a)
Explain iin brief basic software archiecture of a typical DSS with neat diagram.
10 M
6(b)
With a neat diagram, explain digital switching system software classification.
10 M
7(a)
Explain the organizational interfaces of typical DSS central office.
10 M
7(b)
Explain with a neat diagram, a strategy for improving software quality.
10 M
Write short notes on:
8(a)
Generic switch software architecture c. Common characteristics of DSS d. Analysis report for DSS
5 M
8(b)
Recovery strategy
5 M
8(c)
Common characteristics of DSS
5 M
8(d)
Analysis report for DSS
5 M
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