This download link is referred from the post: JNTUA M.Tech 1st Sem last 10 year 2010-2020 Previous Question Papers (JNTU Anantapur)
M.Tech I Semester Supplementary Examinations August/September 2018
ADVANCED DATA COMMUNICATIONS
(Digital Systems & Computer Electronics)
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(For students admitted in 2013, 2014, 2015 & 2016 only)
Time: 3 hours
Max. Marks: 60
Answer any FIVE questions
All questions carry equal marks
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- With neat diagram, explain the following modulation schemes: (i) PSK. (ii) QAM.
- Find out the minimum bandwidth, baud and bandwidth efficiency for the following bit rates and modulation schemes are 8-QAM and 16-QAM.
- fb = 2400 bps.
- fb = 4800 bps.
- fb = 9600 bps.
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- In home two computers are connected by an Ethernet hub. In this a LAN or a WAN? Explain the reason.
- Assume 8 devices are arranged in a mesh topology. How many cables are needed? How many parts are needed for each device?
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- Performance is inversely related to delay. When we use the internet, which of the following are more sensitive to delay: (i) Sending an e-mail. (ii) Copying a file. (iii) Surfing the internet. Explain in detail.
- How many point-to-point WAN's are needed to connect 'n' LAN's, if each LAN should be able to directly communicate with any other LAN.
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- The parity check bit of (8, 4) block code are generated by C5 = d1 + d2 + d4, C6 = d1 + d2 + d3, C7 = d1 + d3 + d4, & C8 = d2 + d3 + d4, where d1, d2, d3 and d4 are message bits. Find:
- G and H.
- Minimum weight of code.
- Error correcting capacity.
- Show that through 2 examples that the code can detect and correct errors.
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- Compare and contract byte-stuffing and bit stuffing.
- Assume the only computer in the residence user PPP to communicate with the ISP. If the user sends 10 network-layer packets to ISP, how many frames are exchanged in each of the following cases:
- Using no authentication.
- Using PAP for authentication.
- Using CHAP for authentication.
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- Consider a space division switch with 100 inputs and outputs. What is the total number of cross points in each of the following cases: (i) Using a single crossbar. (ii) Using a multi-stage switch based on the Clos criteria.
- Consider nXk crossbar switch with 'n' inputs and 'k' outputs.
- Can we say that the switch acts as a multiplexer if n>k?
- Can we say that the switch acts as a demultiplexer if n<k? Give reason.
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- We have defined the parameter 'a' as the number of frames that can fit the medium between two stations, or a = (Tp)/(Tfr). Another way to define the parameter is a = Lb/Fb, in which Lb in the bit length of the medium and Fb is the frame length of the medium. Show that two definitions are equivalent.
- Alice and Bob are experimenting with CSMA using a W2 Walsh table. Alice use the code (+1, -1) and Bob user the code (+1, -1). Assume that they simultaneously send a hexadecimal digit to each other. Alice sends (6)16 and Bob sends (B)16. Show how they can detect what are other person has sent.
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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)
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