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The process of encoding converts information from a source into symbols for communication or storage. Decoding is the reverse process, converting code symbols back into a form that the recipient understands.

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Why use 128b/132b line coding?

To reduce this overhead, 64b/66b encoding was developed, which has only about 3% overhead. This technique was extended to 128b/130b encoding, which improves over 64b/66b by halving the overhead. … However, it seems that there is a 128b/132b encoding as well, and this doesn't seem to be a typo for 128b/130b. …
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