Digital Switching Systems

b. Derive the expression for grade of service of three stage network.

Write short notes on:

d. Analysis report for DSS

Write short notes on:

C. Common characteristics of DSS

Write short notes on:

b. Recovery strategy

Write short notes on:

a) Generic switch software architecture 

Write short notes on:

a) Generic switch software architecture 

b. Explain with a neat diagram, a strategy for improving software quality.

a. Explain the organizational interfaces of typical DSS central office.

b. With a neat diagram, explain digital switching system software classification.

a. Explain in brief basic software architecture of a typical DSS with neat diagram.

c. Explain the need for frame alignment in time division switching network.

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. 

a. Explain S-T-S switching network with neat diagram.

c. Design a three stage network for 100 incoming trunks and 400 outgoing trunks.

a. Draw a neat diagram of four-wire circuit and explain its working.

a. What is grading? Explain different types of grading.

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 calls arrive?            iv) More than two calls arrive? 

b. Define the following terms:

iv) Statistical equilibrium

b. Define the following terms:

iii) Pure chance traffic

b. Define the following terms:

ii) Grade of service

b. Define the following terms:

i) Busy hour

a. Derive the expression for second Erlang's distribution starting from basic principles.

c. With the help of neat diagram, explain the basic types of calls that are usually processed through a DSS.

b. Explain the functions of electronic switching.

a. Differentiate between message switching and circuit switching.

c. Write a short note on European pleisochronous digital hierarchy.

b. A four wire circuit has an overall loss (two-wire to two-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.