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Recent questions tagged errordetection
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ISI2017PCBB8(b)
Consider a simple code C for error detection and correction. Each codeword in C consists of 2 data bits $[d_1, d_0]$ followed by check bits $[c_2, c_1, c_0]$ ... '+' is a modulo2 addition. Write down all the codewords for C Determine the minimum Hamming distance between any two distinct codewords of C
asked
Apr 8
in
Digital Logic
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akash.dinkar12
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2
Morris Mano Edition 3 Exercise 7 Question 42 (Page No. 306)
It is necessary to formulate the hamming code for four data bits $D _3, D _5, D _6 and D _7$ together with three parity bits $P _1, P _2 and P _3$. evaluate the 7bit composite code word for the data word 0010. Evaluate ... error detection in the code. Assume that error occurs in the bit $D _5 and P _2$. Show how the error is detected.
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Apr 6
in
Digital Logic
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ajaysoni1924
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digitallogic
hammingcode
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3
Morris Mano Edition 3 Exercise 7 Question 38 (Page No. 305)
Given the 8bit data word 01011011, generate the 13bit composite word for the Hamming code that corrects the single bit error and detects double bit errors.
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Apr 6
in
Digital Logic
by
ajaysoni1924
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9.5k
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29
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digitallogic
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4
Foruzan,Error Detection and Correction: Exercise,Ques:23 Please Explain
23: We need a dataword of at least 11 bits. Find the values of k and n in the Hamming code C(n, k) with dmin :3. Soln: We need to find k = 2m −1 − m ≥ 11. We use trial and error to find the right answer: a. Let m ... 24 −1 − 4 = 11 (acceptable) Comment: The code is C(15, 11) with dmin = 3. How this n=15 came?? please explain
asked
Mar 17
in
Computer Networks
by
Nishi Agarwal
(
37
points)

127
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computernetworks
errordetection
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votes
0
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5
Foruzan, Error Detection and Correction :Exercise Ques: 32 Please Explain
32: A sender needs to send the four data items Ox3456, OxABCC, Ox02BC, and OxEEEE. Answer the following: a. Find the checksum at the sender site. b. Find the checksum at the receiver site if there is no error.
asked
Mar 17
in
Computer Networks
by
Nishi Agarwal
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37
points)

67
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computernetworks
errordetection
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Andrew S. Tanenbaum Edition 5th Exercise 3 Question 39 (Page No. 255)
The goal of this lab exercise is to implement an errordetection mechanism using the standard CRC algorithm described in the text. Write two programs, generator and verifier. The generator program reads from standard input a ... correct, but by typing generator <file  alter arg  verifier you should get the error message.
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Mar 16
in
Computer Networks
by
ajaysoni1924
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12
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computernetworks
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tanenbaum
errordetection
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Andrew S. Tanenbaum Edition 5th Exercise 3 Question 18 (Page No. 253)
A 1024bit message is sent that contains 992 data bits and 32 CRC bits. CRC is computed using the IEEE 802 standardized, 32degree CRC polynomial. For each of the following, explain whether the errors during message transmission will be ... . (e) There was a 24bit long burst error. (f) There was a 35bit long burst error.
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Mar 16
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Computer Networks
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ajaysoni1924
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22
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tanenbaum
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errordetection
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Andrew S. Tanenbaum Edition 5th Exercise 3 Question 17 (Page No. 253)
A bit stream 10011101 is transmitted using the standard CRC method described in the text. The generator polynomial is x 3 + 1. Show the actual bit string transmitted. Suppose that the third bit from the left is inverted ... . Give an example of bit errors in the bit string transmitted that will not be detected by the receiver.
asked
Mar 16
in
Computer Networks
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ajaysoni1924
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30
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crc
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Andrew S. Tanenbaum Edition 5th Exercise 3 Question 16 (Page No. 253)
What is the remainder obtained by dividing $x^7 + x ^5 + 1$ by the generator polynomial $x^ 3 + 1?$
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Mar 16
in
Computer Networks
by
ajaysoni1924
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12
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computernetworks
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10
Andrew S. Tanenbaum Edition 5th Exercise 3 Question 15 (Page No. 253)
Suppose that a message 1001 1100 1010 0011 is transmitted using Internet Checksum (4bit word). What is the value of the checksum?
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Mar 16
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Computer Networks
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ajaysoni1924
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17
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computernetworks
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tanenbaum
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Andrew S. Tanenbaum Edition 5th Exercise 3 Question 13 (Page No. 252)
A block of bits with n rows and k columns uses horizontal and vertical parity bits for error detection. Suppose that exactly 4 bits are inverted due to transmission errors. Derive an expression for the probability that the error will be undetected.
asked
Mar 16
in
Computer Networks
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ajaysoni1924
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computernetworks
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errordetection
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probability
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Andrew S. Tanenbaum Edition 5th Exercise 3 Question 10 (Page No. 252)
A 12bit Hamming code whose hexadecimal value is 0xE4F arrives at a receiver. What was the original value in hexadecimal? Assume that not more than 1 bit is in error.
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Mar 16
in
Computer Networks
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ajaysoni1924
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computernetworks
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Andrew S. Tanenbaum Edition 5th Exercise 3 Question 8 (Page No. 252)
To provide more reliability than a single parity bit can give, an errordetecting coding scheme uses one parity bit for checking all the oddnumbered bits and a second parity bit for all the evennumbered bits. What is the Hamming distance of this code?
asked
Mar 16
in
Computer Networks
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ajaysoni1924
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computernetworks
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Andrew S. Tanenbaum Edition 5th Exercise 4 Question 27 (Page No. 353)
Give two reasons why networks might use an errorcorrecting code instead of error detection and retransmission.
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Mar 15
in
Computer Networks
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ajaysoni1924
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computernetworks
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15
Error Detection Using CRC
For detecting a single bit error using CRC, it is needed that $x^{i}$ should not be divisible by g(x). So, we make g(x) of at least 2 terms, which renders a single term of e(x) indivisible. But then what is the logic behind keeping MSB as 1. ... any single bit indivisible? For example, $x^{3}+x^{2}$ is guarantees to detect a single bit error at any position. Is it not?
asked
Feb 7
in
Computer Networks
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superak96
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187
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123
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crcpolynomial
crc
computernetworks
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singlebiterror
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16
Self dout
Which phase of the compiler detects the error? #include<stdio.h> int main() { printf(“%d”,2..3); return 0; } I think lexical analyzer am i correct?
asked
Jan 30
in
Compiler Design
by
sreenivas.s1995
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139
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57
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compilerdesign
errordetection
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0
answers
17
Parity Check Self Doubt
How many bits can a 2dimensional parity detect and correct? Is there any general formula for no of bit detection and correction for Ndimensional parity?
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Jan 4
in
Computer Networks
by
vinay chauhan
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73
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computernetworks
errordetection
errorcorrection
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#CN Which protocols provide error correction in data?
TCP UDP IGMP ICMP I think ICMP can’t correct the error in data and rest three protocols can correct data errors!
asked
Dec 1, 2018
in
Computer Networks
by
iarnav
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7.9k
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67
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computernetworks
errordetection
error
errorcorrection
0
votes
1
answer
19
Gateforum Test Series: Computer Networks  Error Detection
Which of the following statements is FALSE for the generator $x^{6}$+1? S1: This generator can detect all burst errors with a length of 5 bits. S2: This generator can detect some but not all burst errors with a length of 6 bits.
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Nov 30, 2018
in
Computer Networks
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Gupta731
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gateforumtestseries
computernetworks
errordetection
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20
GeeksforGeeks
Data transmitted on a link uses the following 2D parity scheme for error detection: Each sequence of 28 bits is arranged in a 4 7 matrix (rows r0 through r3, and columns d7 through d1) and is padded with a column d0 and row r4 of parity bits computed using the ... . The table shows data received by a receiver and has n corrupted bits. What is the minimum possible value of n? 1 2 3 4
asked
Nov 26, 2018
in
Computer Networks
by
Ashish Goyal
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417
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67
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errordetection
2dparity
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votes
0
answers
21
Error detecting and error correcting codes
The IP protocol implements Internet checksum over just the IP header. As the packet passes through the routers, one field called Time To Live (TTL) (8bits long) in the IP header is decremented at each router. So, each router needs ... in the header. Is there a way to update the checksum without having to recalculate the checksum over the entire header?
asked
Nov 24, 2018
in
Computer Networks
by
John Doe
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5
points)

65
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errordetection
errorcorrection
computernetworks
+1
vote
2
answers
22
#CN Forouzan Error Correction Hamming Code
If the Hamming distance between a dataword and the corresponding codeword is three, there are _____ bits in error. A) 5 B) 4 C) 3 D) none of the above
asked
Nov 19, 2018
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Computer Networks
by
iarnav
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225
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computernetworks
hammingcode
hamming
distance
errordetection
0
votes
0
answers
23
#CN Error Detection  How many bit errors can simple parity bit error detection or 1D parity bit can detect?
asked
Nov 16, 2018
in
Computer Networks
by
iarnav
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40
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computernetworks
errordetection
+2
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2
answers
24
GATEBOOK2019CN11
Which of the following CRC generators guarantee the detection of a single bit error? P. $x^4+x^2$ Q. $x^3+x+1$ R. $x^2+1$ S. $1$ Only $P$ Only $P,Q$ Only $P,Q,R$ All of $P,Q,R,S$
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Oct 28, 2018
in
Computer Networks
by
GATEBOOK
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11.4k
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364
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gb2019cn1
computernetworks
errordetection
crc
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2
answers
25
GATEBOOK2019CN14
Given the data word $1010011010$ and the divisor $10111$ what is the codeword to be sent to receiver? $10100110100000$ $10100110100001$ $1010011011$ $10100110110111$
asked
Oct 28, 2018
in
Computer Networks
by
GATEBOOK
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99
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gb2019cn1
computernetworks
errordetection
datalinklayer
+1
vote
2
answers
26
GATEBOOK2019CN15
Minimum hamming distance for detection of $3$ errors or correction of $2$ errors. $5$ $4$ $6$ $3$
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Oct 28, 2018
in
Computer Networks
by
GATEBOOK
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165
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gb2019cn1
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errordetection
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27
GATEBOOK2019CN115
Sixteenbit messages are transmitted using a Hamming code. Check bits needed (minimum) to ensure that the receiver can detect and correct singlebit errors is _____?
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Oct 28, 2018
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Computer Networks
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GATEBOOK
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gb2019cn1
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28
GATEBOOK2019CN116
What is the remainder obtained by dividing $x^7+x^5+1$ by the generator polynomial $x^3+1$? $x+1$ $x^2+1$ $x^2+x+1$ $1$
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Oct 28, 2018
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GATEBOOK
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1
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29
self doubt
CRC can detect any odd number of errors. CRC can detect all burst errors of less than the degree of the polynomial. Please explain and if possible give proof
asked
Oct 15, 2018
in
Computer Networks
by
Vegeta
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823
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47
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crcpolynomial
computernetworks
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votes
1
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30
UGCNETJuly2018II49
To guarantee correction of upto $t$ errors, the minimum Hamming distance $d_{min}$ in a block code must be ______ $t+1$ $t2$ $2t1$ $2t+1$
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Jul 13, 2018
in
Computer Networks
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Pooja Khatri
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