> From: Saku Ytti [mailto:s...@ytti.fi]
> I got quite a bit of replies from sellers selling me cuSFP, insisting they > work. > > So I'd like to clear up on this. For 10/100 to work on SFP slot, the PHY in > the host needs to be multirate. Exception is SGMII which supposedly > supports magic mode where SFP can ask it to send same bit 10 times, then > SFP can discard 9/10 bits, to remain very dumb yet deliver 100M client on > 1GE host. > > RGMII does not support this trick and this trick does not bring you down to > 10M. One box that we have right now, which can't do any of this is ME-4924. > > There is absolutely no reason that you couldn't deliver 'media converter' > or '2 port switch' in a SFP casing, to get that 1 10/100 port in every > 4500-X or EX4550 port you need to cater some legacy. If my desire is odd (2 > people have expressed off list they want same) this won't be built. But if > this is somewhat common demand and missing product, we can certainly get > such SFP built. > > Obviously this SFP would cost bit more than normal cuSFP, as it needs to do > rudimentary buffering, packet dropping and it needs to have frame parser. Considering that Dell and HP at least are shipping brand new hardware with IPMI/BMC/iLO/whatever management ports that can only speak 100mbit when every other Ethernet interface in the box at least gigabit, having a useful way to talk to that port without having to keep separate switching hardware around would be nice. I'm not holding my breath, but you know, along with a pony, this would be nice. Jamie
