Brian Reay wrote:
Just to add to Mike's comment, FEC works by send the same message several
times- in simple terms, in the hope that one with get through correctly. It
is simple to implement, your recieving system just needs to be able to
identify a correct message and use it, not spot a bad message and initiate
either a request for resend or applly some sort of correction method
(assuming there is error correcting code in the message).

FEC is generally used in applications where you don't have time to
request a retransmission of an errored packet, and/or where the
transmission path is simplex, and/or where there are multiplex
receivers for a single transmitter.

If you have the luxuries of time and a full-duplex point-to-point
environment, ARQ is better.

Cheers
Mike