UNIT - 1

Telecommunication Switching & Traffic

Q1) Calculate the intensity of traffic (using Erlang unit) on the 3 problems below:

a) A radio-link with a capacity of 6 channels, with measurements for 30 minutes, every channel average holded for 15 minutes.

b) A measurement of the digital switch over for 25 minutes, processed about 25,000 calls, which have a mean holding time = 3 minutes ( = 3 minutes/call)

c) A web server has a service rate = 1 M bit per seconds, if in a 10-minute measurements received 600 requests, each request requires an average of 100 packet data @ 1,000 bits per packet.

Q2) Explain message switching in detail.

Q3) Explain the three phases involved in the communication via circuit switching.

Q4) What is the difference between electronic and digital switching?

Q5) Explain space division switching.

Q6) Explain Time division switching.

Q7) What is Erlang? Why it is used?

Q8) Describe lost call systems.

Q9) Define Erlang loss system.

Q10) Evaluate the local queuing delay.

Q11) Write the applications of delay formulae.

Q12) What is system with single server? Explain M/M/1 queue.

Q13) What are Kendall’s notations? Write a few of them.

Q14) Write and explain probability distribution function of the Erlang distribution.