Michaelwagner Wrote: > Isn't auto speed negotiation based partly on having enough wires, but > also partly on sending test packets to see how they fare? To tell you > the truth, I never looked into how auto speed negotiation works ... I > had the entire factory wired with new cat5 when I moved in (there was > no existing ethernet infrastructure) and so it all just works, so I > never probed into how it's supposed to back down to 10BaseT, just > assumed it did it somehow based on capabilities at both ends of the > segment and actual experience. Perhaps the second part of the > assumption is wrong. > > As to whether it could be added, it depends on the facilities in the > ethernet chip (I think Sean posted a link somewhere to the spec sheet) > and then if supported at the chip level, someone would have to write > the client side "microcode" and a way of setting it up. ...
For 10/100mb, only 4 wires are used. When link is detected, the two sides send out framing data, and then send out advertisements describing what they can support. They test that they can support the highest capabilities first, and fall back to lower capabilities should test packets fail. I would have suspected that the SB2 would fall back to 10mb but from the data, it seems that this is not supported or not working correctly. For my 2c, the consumer world has for the most part moved past 10base-t - time to move forward. Capable hardware is so cheap, it just doesn't make a lot of sense to me to spend time coding, debugging, and testing support for older or problematic configurations. -- MrC _______________________________________________ Discuss mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/discuss
