> If a box was designed to add forward error correction, I would
> want it to fit between the HDLC chip and the modem in the TNC.
> For that matter, replacing
TS> the That's a _VERY_ _BAD_ idea. At least if you're talking to
TS> different stations, you most likely need different settings for
TS> the FEC and the channel equalizer, so you need additional info
TS> from the L2. Your solution would end up decoding HDLC in the
TS> "FEC" circuit, decode AX.25, and recode it differently.
Well, yes, there are disadvantages, but the information sender should be able
to decide the level of redundancy and robustness and configure this
accordingly. The information receiver should be able to dynamically adapt to
whatever the sender chooses. Several FEC protocols have this sort of
flexibility. However, I don't foresee needed to vary the settings depending
upon which other station we are talking to, but only by interface type. That
is, the HF and VHF settings could be different.
-- Mike, N1BEE