Question paper Data Communication, Papers of Data Communication Systems and Computer Networks

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Ql Q3 Duration: 1 hour Instructions: MANIPAL UNIVERSITY JAIPUR SCHOOL OF COMPUTING AND IT B.Tech. V" Semester Second Sessional Examination 2018 & Branch: CSE /1T /CCE 4T1504-Data Communications (CLOSED BOOK) « All questions are compulsory. | . * Missing data if any may be assumed suitably. © Calculator is allowed. ” Max. Marks: 15+ i. Givenk=2 and n=6, following table shows the data blocks and corresponding [1/2*4 = 2] code words: Data Block | Codeword 00 000000 01 000110 10 001100 11 001111 a) Compute Dmin b) How many erroneous bits in the received codeword can be corrected and how many erroneous bits can be only detected? c) Ifthe received codeword is 000110 find the data block at receiver d) Ifthe received codeword is 011110, what will be the data block? ii. Given a data sequence D = 11100011 and pattern P = 110011, perform the following considering CRC error detection scheme: [1+1+1=3] a) Encode the above data sequence D to find the corresponding code word . b) Express pattern P and the computed code word in part (a) as polynomials c) Draw the shift register implementation i.e. digital logic of the above CRC scheme i. Given the bit pattern 01100, encode this data using ASK and BPSK. Given [1/2*2=1] frequency of carrier signal is 2 Hz and bit duration is 1 sec. ii. Determine the modulation rate of the following bit streams which is to be transmitted at data rate 1 kbps. © +1) . lL Addi 2 000000 Assuming following encoding technique is used: a) There is always transition at the middle of bit interval b) There is transition at beginning of interval for bit ‘0’ _ ¢) There is no transition at beginning of interval for bit ‘1’ iii, Explain Pulse Code Modulation with the help of block diagram. (2] i. Arent] has a bit rate of 4 Kbps and one-way propagation delay of 20 [2] mn ysccond. A channel uses stop and wait protocol. The transmission time of cknowledgment frame is negligible. To get a link utilization of at least 50% , what is the minimum frame size. ii, In Go-Back-N protocol, if the maximum window size is 63, what is the range of the ian sequence number. iii. a between Go-Back-N ARQ Protocol and Selective Reject ARQ (2) Scanned by CamScanner