Planet WGS-5225-8P2SV User Manual page 112

 FEC
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frame). If "frame length check" is enabled, frames with payload size less than
1536 bytes are dropped, if the EtherType/Length field does not match the
actually payload length. If "frame length check" is disabled, frames are not
dropped due to frame length mismatch. Note: No drop counters count frames
dropped due to frame length mismatch
FEC is short for Forward Error Correction. It is a technique for controlling errors
over an unreliable link. The idea is that the sender adds some extra bits to the
frame that allows a receiver to correct bit errors in the received frame.
R-FEC (IEEE802.3 clause 74 - sometimes called Firecode). This is meant for
10G. The parameter affects both what is requested during clause 73 aneg and
what the port is configured to use if not running clause 73 aneg. If running
clause 73 aneg on 10G ports we always tell the link partner that we support R-
FEC. What the end user can control with the fec command is whether we
request R-FEC. If either us or the link partner requests R-FEC, the port will end
up using R-FEC.
auto: This is the default and means the following:
If a 10G port runs clause 73, R-FEC will be requested.
Otherwise, no FEC will be enabled.
r-fec: If a 10G port runs clause 73, only R-FEC will be requested. If a 10G port
does not run clause 73, but is loaded with at least a 10G SFP and the speed is
at least 5G, only R-FEC will be enabled. Otherwise, no FEC will be enabled.
none: If the port is running clause 73, R-FEC will not be requested (but
remember that this does not mean that the clause 73 aneg will not result in the
port running FEC). Otherwise, the port will not run any FEC.
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User's Manual of WGS-5225-8P2S Series