BER is usually combatted with technologies which embed redundant bits into the datastream so an occasional bit error does not take out a packet. In conjuction of 10GbE this would probably mean G.709. I would be happy to learn whether the typical link has BER of 10E-15 or 10E-12 and how fast retransmit plays in the picture of losing a bit every ten minutes or so.The problem is that the BER of a typical optical link is high enough that the link will almost certantly discard at least one packet before you get out of slow-start and once that happens it, AIMK means it take hours or even days to get back up to the top even assuming you don't lose further packets. This isn't a problem for most people, but it's definalty a problem for the HPC community.
Pete
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