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.

 - Jonathan Morton

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