This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)
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Code: 9D06104
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M.Tech I Semester Supplementary Examinations February/March 2018
ADVANCED DATA COMMUNICATIONS
(Digital Systems & Computer Electronics)
(For students admitted in 2012, 2013, 2014, 2015 & 2016 only)
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Time: 3 hours | Max. Marks: 60 |
Answer any FIVE questions
All questions carry equal marks
*****
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- Illustrate the amplitude shift keying and frequency shift keying.
- Determine the minimum bandwidth, baud and bandwidth efficiency for the following bit rates and modulation schemes BPSK and QPSK: (i) fb = 2400 bps. (ii) fb = 4800 bps. (iii) fb = 9600 bps.
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- For each of the following 4 networks, discuss the consequence if a connection fails
- Seven devices arranged in a mesh topology.
- Seven devices arranged in a star topology.
- Seven devices arranged in a bus topology.
- Seven devices arranged in a ring topology.
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- What is the maximum number of characters or symbols that can be represented by Unicode?
- For each of the following 4 networks, discuss the consequence if a connection fails
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- Distinguish between telephone network and internet? What are the similarities? What are the differences?
- When a party makes a local telephone call to another party, is this point-to-point or multipoint connection? Discuss in detail.
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- For a (7, 4) cyclic code with received vector is 0100110, with generator polynomial g(x) = 1 + x + x³. Draw the syndrome computation circuit and detect and correct the error if any.
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- Byte-stuff the following frame payload in which 'E' is the escape byte, 'F' is the flag byte and 'D' is a data byte other than an escape or a flag character.
DEDDEDDEFDFD - Assume PPP is in the authentication phase, show payload exchanged between the nodes if PPP is using: (i) PAP. (ii) CHAP.
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- Byte-stuff the following frame payload in which 'E' is the escape byte, 'F' is the flag byte and 'D' is a data byte other than an escape or a flag character.
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- In a network, datagram and virtual-circuit need a routing or switching table to find the output port from which the information belonging to a destination should be sent out, but a circuit switched network has no-need for such table. Give the reason for this difference.
- What is the role of the address field in a packet travelling through a virtual-circuit network?
- In a bus 1-persistance CSMA/CD with Tβ = 50 µs and Tfr = 120 µs, there are 2 stations, A & B. Both stations start sending frames to reach other at the same time. Since the frames collids, each station tries to retransmit. Station A comes out with R = 0 and station B with R = 1. Ignore any other delay including the delay for sending jamming signals. Do the frames collide again? Draw a time line diagram to prove your claim. Does the generation of a random number help avoid collision in this case?
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- There are only 3 active stations in a slotted ALOHA network A, B and C. Each station generates a frame in a time slot with the corresponding probabilities ра = 0.2, рв = 0.3 and pc = 0.4 respectively.
- What is the throughput of each station?
- What is the throughput of N/W.
- Check to see the following set of chips can belonging to an orthogonal systems:
[+1, +1, +1, +1], [+1, -1, -1, +1], [-1, +1, +1, -1], [+1, -1, -1, +1]
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- There are only 3 active stations in a slotted ALOHA network A, B and C. Each station generates a frame in a time slot with the corresponding probabilities ра = 0.2, рв = 0.3 and pc = 0.4 respectively.
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This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)