Hi,
It seems to have been said a number of different ways but 100Meg can be set to full or
half duplex, 10Meg can be set to full or half duplex. There is however a requirement
that is the the hardware must be able to support both the speed and the duplex
settings.
Ethernet in the true sense can only be 10Meg Half duplex on thick coax cable. The
IEEE committee however have other standrds 10BaseT can be 10Meg half or full duplex.
100BaseT can be 100Meg half or full duplex. They also have several others such as
10Base5 (thick coax) 10Meg being coax, shared, only one Transmit/Receive circuit must
be half duplex. 10Base2 (thin coax) same as thick re duplex etc. There are also
several others basically the same rules as 100BaseT when it comes to duplex.
Most modern day devices allow 10/100Meg half or full duplex this allows legacy systems
to interoperate. Coax has be written out of the standards.
There are however heaps of devices that still only have 10Meg Half duplex ports. They
must and can only be used at 10Meg Half Duplex end of story for them. The 2500 series
routers are quite old (not compared to me but more than 3 years is common). The
earlier ones were released prior to 100BaseT being available.
Just some thoughts
Teunis,
Hobart, Tasmania
Asutralia
On Thursday, March 01, 2001 at 03:58:18 AM, SAIF wrote:
> well its not a terminology thing u see its understood when u use 100mbps its then not
> csma/cd ethernet thing ,they made it like thre will be no collisions and speed will
>be
> 10 times than 10 mbps
> yes u r right on 36xx router there is full/half/auto duplex but u didnt get the idea
> ,its basically technology which is sensing which media is supported to that interface
> ,if it is 10mbps then interface will make it half duplex ethernet and iffff it is
>100mbs
> it will make it fast ethernet full duplex and u have choice to make it half/full
>duplex
> by ur choice according to ur existing medium and toplogy
> THAT PORT MUST BE NOT A FASTETHERNET PORT BUT IT CAN BE IF U USE IT IN 100MBPS WAY
> THERE IS ANOTHER THING YES IT IS POSSIBLEEEE I AGREE U CAN WORK 10BASE T (ONLY NOT
> COAXIAL) WITH FULL DUPLEX BUT THE THING IS THAT WHAT I WAS POINTING THAT CISCO
>PRODUCTS
> USUALLY DONT SUPPORT FULL DUPLEX WITH 10MBPS
> AM I WRONG ?????
>
> Neil Schneider wrote:
>
> > Sorry but you are incorrect. (unless we just have a terminology difference
> > here) Just becuase you are running 100mbps. it is not automatically full
> > duplex. the Fastethernet ports on routers (3640 seriesfor example) can be
> > set to full/half/auto duplex. why bother with a half duplex setting if all
> > fastethernet is full duplex?
> >
> > --
> > Neil Schneider
> > MCT MCSE CCSI CCNP
> >
> > "SAIF" <[EMAIL PROTECTED]> wrote in message
> > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > > 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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