JNTU
JNTU B.Tech II DATA COMMUNICATION Previous Question Paper (April/May - 2023 - R15)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Define a Bit rate.
Answer
Bit rate is defined as the number of bits transmitted per second over a digital communication channel. It is measured in bits per second (bps) and represents the speed at which data is transferred.
Distinguish between data rate and signal rate.
Answer
Data rate, also known as the bit rate, is the number of data elements (bits) sent in one second, measured in bits per second (bps). It defines the speed at which information is transmitted.
Signal rate, also known as the pulse rate, baud rate, or modulation rate, is the number of signal elements sent in one second, measured in baud. It defines the number of changes in the physical signal per second.
The relationship between the two is given by the formula:
Where S is the signal rate, N is the data rate, and r is the number of data elements carried by each signal element. While the data rate is concerned with the information itself, the signal rate is concerned with the physical transmission medium's capacity to handle changes.
How the twisting affects performance in twisted pair cable?
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What is byte interleaving technique in Time Division Multiplexing?
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Explain about gain hits and dropouts.
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List the transmit and receive frequencies of cordless telephones.
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Write the features of GSM?
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List the advantages of satellite communication over mobile communication.
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What is a Cable Modem?
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What is meant by Modem Synchronization?
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Part B
List and explain four modes of transmission for data communications circuits.
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What is the significance of layered architecture in Computer networks?
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Define Electrical Noise? Explain various types of Noise in detail.
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Explain about Data communication networks.
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What is statistical TDM? Explain in what way it is advantageous as compared to standard TDM system.
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With neat block diagram, explain the general system of optical fiber communication.
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Compare parallel-conductor transmission lines and coaxial transmission lines.
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Discuss in brief the application of satellite communications.
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Draw and explain the Ringing Cycle and frame format of the caller ID.
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Explain the Call Progress Tones and Signals.
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A telephone line is known to have a loss of 20dB. The input signal power is measured as 0.5W, and the output noise level is measured as 4.5μW. Using this information, calculate the output signal to noise ratio in dB.
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Mention the advantages of Second-Generation Cellular Telephone Systems over First-Generation Analog Cellular Telephone systems.
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What are the two primary methods used for error correction? Explain them.
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What are the different methods of error detection and explain any two methods.
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Distinguish between synchronous and Asynchronous Voice-Band Modems.
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Explain in detail about 56K Modems.
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Write a brief note on ITU-T modem recommendations.
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Calculate the bandwidth efficiency of a 202 modem with data transmission rate of 1000bps and available bandwidth of 2400 Hz.
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