5 ms·
Does SFP+ not have a scrambler/descrambler to make this a non issue, like almost all other phy? https://en.m.wikipedia.org/wiki/Scrambler https://en.m.wikipedi
by nomel 2y ago
Does SFP+ not have a scrambler/descrambler to make this a non issue, like almost all other phy?
https://en.m.wikipedia.org/wiki/Scrambler https://en.m.wikipedia.org/wiki/Scrambler
- jrockway 2y agoThis is done before the SFP+ module sees the signal, but the module makes the design assumption that it is being done. It is right for 10G ethernet, it is wrong (at a certain time scale) for SPDIF. I also think that https://en.wikipedia.org/wiki/Line_code https://en.wikipedia.org/wiki/Line_code is the term you're looking for.
- nomel 2y agoAhh, I'm only familiar with the copper side of things. But, that explains why the search came up with nothing for SFP+! > I also think that https://en.wikipedia.org/wiki/Line_code https://en.wikipedia.org/wiki/Line_code is the term you're looking for. In 10G ethernet phy's, it's a multiplicative (self-synchronizing) scramblers [1] and does not use line code. From what I remember, it's statistically fine, and plays into LDPC correction easier. [1] https://www.iol.unh.edu/sites/default/files/knowledgebase/10gec/10GbE_Cl49.pdf https://www.iol.unh.edu/sites/default/files/knowledgebase/10...