FEC (forward error correction) turns a mediocre to bad BER into
a
good BER. It mitigates noisy eyes. Many versions exist with
different gains and costs
•
Ethernet uses FEC in:
–
1000BASE
-
PX (EPON)
–
10GBASE
-
KR
–
10GEPON
–
10GBASE
-
T
–
DSL
•
High end long haul telecoms use FEC
•
P802.3ba links have limited power budgets and SNR,
for e.g. eye safety reasons. Parallel lanes have
crosstalk. We can benefit from FEC too.