hi,
i agree with cito. for as long as you have the correct pair on the Tx and
Rx pins on both ends of the cable, it should work. i can have wbl/bl on 1-2
and wbr/br on 3-6 and still have the same performance as with using or and
gr pairs. the key is that you' ve got to have the same pair at the same
pins at both ends (unless you're doing a 'cross' cable). of course
standards are standards and it's worthwhile following them to eliminate
guessing. but hey, TIA568A is using the reverse color code for the TX/RX
pairs compared to TIA568B so which is which? one just have to make sure the
same pair is used for the 1-2 and 3-6 pins.
i think this may be more than a cabling problem. are RJ45 jacks used
between the switch and the pc? are they rated 100Mbps? how about the nic
setup, is it sharing IRQ with another device? are the setups identical with
those working properly? there might be some small differences that one can
easily miss.
it is also possible that the switch has a problem. i had a switch that
can't handle 100Mbps on a vlan if the vlan ports defined are not sequential
and this clearly indicates a deficiency in the device firmware - that being
not able to forward packets at full 100Mbps speed if it has to skip ports
while it works perfectly at 10Mbps.
willie
At 12:20 AM 08/17/2000 +0800, Ronneil Camara wrote:
>Hi Cito,
>
> > -----Original Message-----
> > From: Cito Maramba [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, August 16, 2000 7:39 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: [plug] 100BaseT dropping packets
> >
> >
> > On Wed, 16 Aug 2000, fooler wrote:
> >
> > > pre-crimped or not is still the same as long you
> > properly crimp and follow the
> > > standard color scheme whether its 10, 100, 1000 or 10000 mbps.
> > >
> >
> > What is important is that wires 1 and 2 are from the same
> > pair and wires 3
> > and 6 are also from the same pair. The standard colour scheme
> > ensures this
> > but you can follow any colour scheme as long as you follow the abovre
> > rules.
> >
>
>You're partly right but it's not guaranteed to work at 100. If you'll just
>follow the 1-2-3-6 pin configuration, your data might not travel at wire
>speed and would definitely drop you at 10mbps. You should follow the color
>combination because of the twisting of each pair. The twisting is one of the
>most important part of the tp cable. So, if we will not comply with the
>color specification, then there's a possibility that we'll not achieve a
>better throughput.
-
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