Guru Gobind Singh Indraprastha Vishwavidyalaya 2005 B.Tech Telecommunications network - Question Paper

Fifth Semester [B.Tech] - November 2005

Paper Code : ETEC – 307 Subject : Telecommunication Networks

Time : 11/2 Hours
Maximum Marks : 30

Note : Attempt any three ques. in all. Q1 is compulsory. every ques. carries 10 marks.


Q1 ( a ) provide short an d to the point answers of the following:

Differentiate ranging from a time switch and a space switch.
Is a TS switch non-blocking? Justify your ans.
What is tropo-scatter communication?
In a group of 5 servers, every is occupied for 15 minutes in an observation interval of two hours. compute the traffic carried by the group.
An exchange is designed to carry 200 calls during the busy hour. 1 day the number of calls during busy hour is 180. compute the grade of service.

Q2 ( a ) What is a hybrid junction? how does the hybrid junction deteriorate the speech quality? What is the listener's and talker's echo? elaborate echo cancellers and echo suppressors?

Q3 ( a ) What is the sky wave mode of communication? describe critical frequency and skip zone. Why are the communication frequencies various for day and night operations in sky wave communication? 10

Q4 ( a ) What is line of sight communication? Is the optical horizon identical as teh radio horizon? What is fading and how can its effects be reduced? 10

Earning:   Approval pending.