Date: Sat, 5 Mar 2005 10:56:01 +0100 From: Wilko Bulte <wb@freebie.xs4all.nl> To: sthaug@nethelp.no Cc: stable@freebsd.org Subject: Re: 1000baseTX? Message-ID: <20050305095601.GA4821@freebie.xs4all.nl> In-Reply-To: <21136.1110016329@bizet.nethelp.no> References: <20050304233814.U4084@carver.gumbysoft.com> <21136.1110016329@bizet.nethelp.no>
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On Sat, Mar 05, 2005 at 10:52:09AM +0100, sthaug@nethelp.no wrote..
> > > In man pages, dmesg and ifconfig of FreeBSD5, GbE operation over
> > > twisted pair is mostly referred as '1000baseTX'. I guess most of them
> > > should be replaced by '1000baseT'. 1000base"TX" and 1000base"T" are
> > > different standard and they are not compatible ("TX" needs CAT6 cable
> > > and uses pairs in different way). Also 1000baseTX support is very
> > > rare yet. I'm sorry I'm not sure if some devices really support "TX".
> >
> > Do you have any documentation to back up this claim?
>
> 1000baseTX was an attempt at producing less expensive hardware (NICs
> etc) that could be used with Cat6 cabling. It is basically dead, and
> was never blessed by the IEEE.
>
> The IEEE is quite clear on the fact that Gigabit Ethernet on Cat5 UTP
> is called 1000Base-T. See for instance Chapter 34, "Introduction to
> 1000 Mb/s baseband network", in IEEE 802.3-2002, available from
>
> http://standards.ieee.org/getieee802/802.3.html
>
> So using 1000baseTX as the name in FreeBSD is clearly wrong.
Probably just as right or wrong as 99% of the NIC cards docs.
Next to every gigE card I have had my hands one mandated at least
CAT5e but generally preference was expressed for CAT6.
--
Wilko Bulte wilko@FreeBSD.org
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