Re: Collisions using 3Com 3c905C-TX ethernet cards.

[Chuck Swiger <cswiger%mac.com@localhost>]

On Apr 22, 2011, at 3:55 PM, Thor Lancelot Simon wrote:
>> I won't try to quote your "netstat -i" output since it was poorly wrapped,
>> but a quick estimate shows about 1% collision rate.  That's not unusual
>> for a hub or crossover when running at 100Mbps; to fix it, use a switch
>> instead.
> 
> That doesn't make any sense -- how is it possible to have a legitimate
> collision on a crossover cable?  Are you sure there is not a duplex
> mismatch?

You're right for 100Base-T and 100Base-TX which use two pairs over Cat-5 
cabling (and one pair is dedicated to either send or receive with a crossover 
cable); but I seem to recall that collisions still happen with a 100Base-T4 
crossover cable, which uses four pairs rather than two.

Moot point when considering a TX NIC, though....

Regards,
-- 
-Chuck