KwickClips Networks and the Internet · 42 sec · free
With even parity, is a byte with five 1s correct?
Short answer. No. Five is odd, so there is an error.
What can a parity block do that a single parity bit cannot?
It locates the exact bit that is wrong.
Parity
| Even parity: even count of 1s |
| Five 1s means an error |
| Block: bad row meets bad column |
Remember
| Block locates the bad bit |
Even parity. The byte has five ones. Is it correct? No, it is wrong. Even parity needs an even count of ones. Five is odd, so error. A parity block finds the exact bit. Remember. A parity block locates the bad bit.
This clip is from the full lesson: Error Detection: Parity, Checksum, Echo Check and ARQ — 8 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: Cambridge IGCSE Grade 9 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478), Cambridge IGCSE Grade 10 Computer Science (0478)
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