Thor Lancelot Simon wrote:

>On Wed, Nov 09, 2005 at 07:15:20PM -0500, Chris Tribo wrote:
>  
>
>>I agree, but it should not be necessary according to the NWAY spec.
>>
>>"If Auto-Negotiation exists at only one end of a twisted-pair link [...]
>>    
>>
>
>If you look at the actual specification, you'll see that there are in fact
>conditions in which duplex *can not* be autonegotiated.  The state machine
>just can't handle some of the combinations of link partners that exist.
>
>Thor
>  
>
Yes, which is why when forcing just one side of a link, it is best to
force half duplex.  Link partners that cannot negotiate duplex will fall
back to half duplex.

Of course if you cannot use autonegotiation and can force both sides to
full duplex, then that is better.

As far as I'm aware, the link speed can pretty much always be
negotiated/detected.

-- 
Garrett D'Amore                          http://www.tadpolecomputer.com/
Sr. Staff Engineer          Extending the Power of 64-bit UNIX Computing
Tadpole Computer, Inc.                             Phone: (951) 325-2134