u We might misinterpret sentinels as data or vice versa u What will the frames

U we might misinterpret sentinels as data or vice

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u We might misinterpret sentinels as data or vice versa u What will the frames look like? In general, need some way to make sure we’re OK u Error detection—and perhaps correction CSE 123 – Lecture 3: Error Handling 7
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Per - Frame Detection Codes Want to add an error detection code per frame u Frame is unit of transmission; all or nothing. u Computed over the entire frame—including header! Why? Receiver checks EDC to make sure frame is valid u If frame fails check, throw it away We could use error-correcting codes u But they are less efficient, and we expect errors to be rare u Counter example: satellite communication CSE 123 – Lecture 3: Error Handling 8 Payload Header EDC
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Error - Detecting Codes Implemented at many layers u We’ll mainly focus on link-layer techniques today CSE 123 – Lecture 3: Error Handling 9
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Basic Idea: Coding The problem is data itself is not self-verifying u Every string of bits is potentially legitimate u Hence, any errors/changes in a set of bits are equally legit The solution is to reduce the set of potential bitstrings u Not every string of bits is allowable u
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  • Fall '08
  • Varghese,G

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