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Foruzan, Error Detection and Correction :Exercise Ques: 32 Please Explain
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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.
computer-networks
error-detection
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Mar 17, 2019
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Computer Networks
Nishi Agarwal
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data items given in hexadecimal. So, convert it into binary and then add all these binary codes.if there is a carry then add it. finally do the 1's complement of the result after addition and it will be called 16-bit checksum at sender side. append it to the data items and send it to receiver. if at receiver after adding these codes,if answer is zero then there is no error and checksum will be same at receiver.
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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
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 = 1 k = 2m −1 − m = 21 −1 − 1 = 0 (not acceptable) b ... = 4 k = 2m −1 − 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, 2019
in
Computer Networks
Nishi Agarwal
625
views
computer-networks
error-detection
0
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answers
2
114
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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!
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
iarnav
114
views
computer-networks
error-detection
error
error-correction
1
vote
2
answers
3
445
views
#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
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
in
Computer Networks
iarnav
445
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computer-networks
hamming-code
hamming
distance
error-detection
2
votes
1
answer
4
230
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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?
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. Isn't just keeping ... to make 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, 2019
in
Computer Networks
superak96
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crc-polynomial
computer-networks
error-detection
single-bit-error
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