100mbps is not ethernet be sure its fast ethernet ,also their is no collisions in fast
ethernet ,its colliision free and this is only possible if u have one way to send and
one way to recieve data simultaneously :) i am sure u got the idea
secondly in ethernet there are collisions and if there are colliisions  Can u use one 
to
send and one way to recieve simultaneously with collisions so if u cant the result is
ethernet works in half duplex mode and fast ethernnet works in full duplex
if u have any thing different than me plz share with us
waiting ur reply
Saif

Neil Schneider wrote:

> It is NOT true that ethernet is half and fastethernet is full duplex.
> Either 10Mbps or 100Mbps ehternet can be run in half or full duplex mode.
> And offhand I don't know if the 2500 AUI port will do full ethernet.
>
> --
> Neil Schneider
> MCT  MCSE  CCSI  CCNP
>
> "SAIF" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > NO ITS ETHERNET PORT AND WORKING HALF DUPLEX ONLY ,U SEE CISCO GIVES
> FASTETHERNET PORTS
> > SPECIALLY IN THEIR ROUTERS SPECIALLY IN 4XXX SERIES AND U KNOW ETHERNET
> WORKS IN HALF
> > DUPLEX AND FASTETHERNET WORKS IN FULL DUPLEX  SO THE RESULT IS AUI PORT IS
> HALF DUPLEX
> > ETHERNET NOT AUTO SENSE AND IF U WANT AUTOSENSE 10/100 BASE T  GO TO ANY
> OTHER ROUTER
> > ,CHECK THE ROUTER;S MANUAL :)
> > HOPT IT WILL HELP
> > IS IT ?
> >
> > Turfis wrote:
> >
> > > Is the Ethernet AUI port on the 2500 series Cisco routers Full Duplex
> > > compatible?  Does it autonegoiate?  Can you hard code the interface for
> > > half/full/auto?  Thanks!
> > >
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