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Branch/Semester: ETC, AEI/6th

Full Mark: 30Subject: CN&DC Time: 1hr

Class Test -I

(Answer any three including question no. 1)

1. (2X5)

(a) What is data communication and networking? What are the components

required for data communication?

(b) What is the difference between bit rate and baud rate?

(c) What are different transmission impairment s present over a channel?

(d) For a channel of 1MHz bandwidth the SNR is 63. What is the capacity of

channel? If actual bit rate is 2Mbps less than capacity then what is the

approximate signal level for the channel?

(e) Differentiate between synchronous and asynchronous serial mode

transmission?

2.(a) Mention different layers of OSI model. (2)

(b) Describe the function of different layers of an internet model. (8)

3.(a) What do you mean by multiplexing? What are the different multiplexing

techniques? Differentiate between synchronous and statistical TDM. (5)

(b) Assume a voice channel occupies a bandwidth of 4kHz. We need to multiplex

12 voice channels with guard band of 500Hz using FDM. Calculate the required

bandwidth. (5).

4. Draw the graph for the following line coding scheme for the data

sequence 1010011101011010 (10)

(i) Unipolar (iv) Differential Manchester

(ii) NRZ-I (v) AMI

(iii) Manchester

All the best

Branch/Semester: ETC, AEI/6th

Full Mark: 30Subject: CN&DC Time: 1hr

Class Test -I

(Answer any three including question no. 1)

1. (2X5)

(a) What is data communication and networking? What are the components

required for data communication?

(b) What is the difference between bit rate and baud rate?

(c) What are different transmission impairment s present over a channel?

(d) For a channel of 1MHz bandwidth the SNR is 63. What is the capacity of

channel? If actual bit rate is 2Mbps less than capacity then what is the

approximate signal level for the channel?

(e) Differentiate between synchronous and asynchronous serial mode

transmission?

2.(a) Mention different layers of OSI model. (2)

(b) Describe the function of different layers of an internet model. (8)

3.(a) What do you mean by multiplexing? What are the different multiplexing

techniques? Differentiate between synchronous and statistical TDM. (5)

(b) Assume a voice channel occupies a bandwidth of 4kHz. We need to multiplex

12 voice channels with guard band of 500Hz using FDM. Calculate the required

bandwidth. (5).

4. Draw the graph for the following line coding scheme for the data

sequence 1010011101011010 (10)

(i) Unipolar (iv) Differential Manchester

(ii)NRZ-I (v)AMI

(iii) Manchester

All the best

Department of Electronics and Telecommunication

Engineering.

C.V. Raman College of Engineering, Bhubaneswar

Department of Electronics and Telecommunication

Engineering.

C.V. Raman College of Engineering, Bhubaneswar