Download JNTUK M-Tech 2020 R19 ECE Digital Data Communications Model Question Paper

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I M. Tech I Semester (R19) Regular Examinations

DIGITAL DATA COMMUNICATIONS

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DEPARTMENT OF ELECTRONICS & COMMUNICATIONS ENGINEERING

MODEL QUESTION PAPER

TIME: 3Hrs. Max. Marks: 75

Answer ONE Question from EACH UNIT.

All questions carry equal marks.

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UNIT-I

1. a). Explain the principle of QAM with the help of a neat diagram.
   b). What is a constellation diagram? Explain the constellation diagram of 16QAM.



OR

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2. a). Explain the OSI model for networking in brief. How does it differ from TCP/IP model?
   b). What are different types of digital data transmission modes? Explain with examples.

UNIT-II

1. a). With the help of a neat diagram, explain the DTE-DCE interface.
   

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   b). Explain the various network topologies and compare the performance of each



OR



2. a). What are the various types of error correction codes? Explain any one.
   

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   b). Compare the synchronous and asynchronous datalink protocols.

UNIT-III

1. a). What are the different types of packet switching? Explain.
   b). Explain the architecture of IEEE'802.6.



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OR



2. a). What are the different functions of bridges in the network? Explain various types of bridges used in the network.
   b). Compare the time division and frequency division multiplexing techniques.

UNIT-IV

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1. a). What is the need for multiplexing and explain various types of multiplexing techniques?
   b). Explain various LAN topologies.



OR




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2. a). Compare various switching techniques in detail.
   b). Explain the function of various internetworking devices.

UNIT-V

1. a). Briefly explain various multiple access techniques.
   b). What are the demerits in OFDMA? Explain how they can be overcome?

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OR



2. a). Explain the principle and working advantages and applications of CDMA.
   b). Explain the principle and working of CSMA/CA technique in detail.

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