Dr.A.P.J.Abdul Kalam University BE V SEM ALL BRANCH Voice & Data Communication [EC502] Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University 

Bachelor of Engineering

Fifth Semester Examination, Dec-2020

Voice & Data Communication [EC502]

Branch-EC

Time: 3:00 Hrs Max Marks 70

Note : (i) Attempt any five questions out of eight.

(ii) All questions carry equal marks.

iii) Answer should be precise and to the point only.

iv) Assume suitable data if necessary and state them clearly.

Q.1 (a) What is cross talk? What is meant by near-end cross talk and far-end cross talk?

(b) Explain and draw the block diagram of an electronic telephone?

Q.2 (a) What is common channel signaling system number 7 (SS7)? Also give its network function?

(b) Define the following term :–

(i) Service provider (ii) Instruments (iii) Local Loops

(iv) Trunk circuit (v) Exchanges

Q.3 (a) Explain with the help of diagram multichannel TDM system

(b) Explain with the help of diagram seven layers of OSI?

Q.4 (a) Discuss Telephone Exchange hierarchy? With the help of an example describe a telephone

numbering plan?

(b) What is digital exchange? Also explain local office telephone exchange?

Q.5 (a) Define multiplexing. What are the different types of multiplexing?

(b) Explain Frame synchronization? Compare between bit interleaving and word interleaving.

Q.6 (a) Explain line encoding in detail with the help of example.

(b) Write short note on :-

(i) VRC (ii) LRC

Q.7 (a) What is caller ID and when it is used? Also explain the function of telephone set?

(b) Differentiate between FDM and WDM. Also write advantage and disadvantage of WDM.

Q.8 (a) What is Topology? Explain it along with its type.

(b) What are the steps involved in creating a Hamming code?

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