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The reason is that those uncoded bits already have very good quality (low BER). Leaving them uncoded can reduce the overhead introduced by FEC.


Technically, there's no copying to the various strands. With PON, the splitter is a passive, unpowered unit that optically splits the downstream light into multiple, weaker rays. Each 1:2 split attenuates the signal by (at least) 3 dB. Up to 1:64 splits are common, depending on overall fiber length and power budget, up to 1:256 is possible. It's a bit like ...

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