On Nov 29, 2013, at 9:47 PM, Jonathan Morton wrote: > > On 30 Nov, 2013, at 7:39 am, Gregg Eshelman wrote: > >> That causes problems with many 10/100/1000 megabit switches and routers >> which rely on media type identification instead of sussing it out from the >> data transmission. No media type ID, no connection for you! > > I thought the spec was to default to 10baseT half-duplex if auto-negotiation > was not present at either end. That works well enough with a 3c509B in a PC, > for example, and it also works just fine with the adapted MACE AAUI in my > 840AV and 8100/80, and the 8390-based NuBus card in my IIcx, when I attach > those to a 10/100 switch. > > The 3c509B was one of the first cards to support 10baseT *full* duplex, but > did not support auto-negotiation and therefore requires a managed switch > (with the port forced to the correct mode) to make use of that feature. > However, in half-duplex mode it works just fine as-is.
The problem isn't really with the various Ethernet cards, the problem is with trying to auto-negotiate the speed with a card that was never designed to negotiate speed. The auto-negotiation process is making certain assumptions about the device on the other end that aren't true in some cases. And so auto-negotiation doesn't always work. Why it couldn't have been designed to fallback to 10BaseT, I don't know. -- -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
