I think what John is getting at is that there is still contention. In his
example with two clients trying to reach one server, there's contention at
the switch, and at the server possibly. There's no contention on the medium
itself. There's only one device trying to send at any one time. The switch
has its transmit pair and the server has its own transmit pair. If the
switch has two frames to send to the server, the backup happens at the
switch. Does that make sense?
Priscilla
At 08:33 AM 12/26/00, Andy Walden wrote:
>This is correct. You don't use full duplex if you are competing for
>bandwidth, ie, plugged into a hub. But if you are plugged into a switch,
>there is only one bandwidth domain between the device and switch and
>with nothing competing for the bandwidth on that link so you can go full
>duplex.
>
>andy
>
>On Tue, 26 Dec 2000, John lay wrote:
>
> > Priscilla, everybody,
> >
> > I am confused. Ethernet and FastEthernet uses the CSMA/CD as a channel
> > allocation techinque in a shared media access envoiroment.
> > Here it comes the confusion, when you are saying that the Full-duplex does
> > not support CSMA/CD because the transmit and receive are on different
> wires.
> > This implies that in this case there is no shared media, how come if you
> > have two clients competing to talk to the same server simultaneously....!!
> >
> > Thanx
> >
> >
> > On Mon, 25 Dec 2000 16:36:11 -0800, Priscilla Oppenheimer wrote:
> >
> > > It's true for Ethernet because Ethernet's CSMA/CD media access control
> > > method has strict timing requirements, which result in strict length
> > > restrictions. Half-duplex uses CSMA/CD. Full-duplex does not.
> > >
> > > I wouldn't say it's true in general, however.
> > >
> > > Priscilla
> > >
> > > At 05:32 PM 12/25/00, Li Song wrote:
> > > >"full-duplex can be used over longer distance than
> > > >half-duplex" ??
> > > >what 's your opinion ??
> > > >
> > > >
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