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Re: [K12OSN] Gigabit on cat5 and even cat3!



Might not have been real gigE
Just an ethernet-like protocol that ran at 1Gbps
Some weird proprietory hack they are pushing.
Cheers,
Rob

On Wed, 11 Jun 2003 15:07, Terrell Prude', Jr. wrote:
> Actually, the Gig-E spec for twisted pair (IEEE 802.3ab) always has
> specified Cat 5.  You are quite correct in saying that you don't need
> Cat 5e.  However, there's no way you'll get it working across Cat 3 at
> full Gig-E speeds, if at all.  You'd be lucky to get 20Mbps across it,
> assuming it even works!  Even if it does somehow sync up across Cat 3,
> you'll have so many CRC errors it's crazy; you're much better off simply
> upgrading your cable plant, even given what it costs.  We've had to do
> exactly that to a bunch of our schools, 'cause even 100BaseTX just will
> not work across Cat 3 (100BaseT4 will, but nobody makes those anymore).
>
> If someone's figured out how to actually pull off Gig-E across *Cat 3*,
> then it's totally nonstandard and violates every IEEE spec that exists.
>  You actually *saw* this running on Cat 3 at *full* 1Gbps?  If so, what
> were they using for a data xfer demonstration?  A FTP session?  A
> Windows "drag 'n' drop" file copy?  Pardon me if I seem a bit cynical,
> but I just have a very hard time believing IEEE 802.3ab Gig-E on Cat 3
> of *any* cable length.
>
> --TP
>
> Richard K. Ingalls wrote:
> > Just wanted to share:
> >
> > I learned at the International Academy of Science last week that there
> > is a company that makes NICs and Switches that allow 100% Gigabit
> > Ethernet speeds on existing cat5 & cat3 cables (not just cat5e).  That
> > means we can upgrade to Gigabit backbones without rewiring!  Just buy
> > new switches and new NICs for the servers and you're done.  Very
> > cool!  I couldn't believe it when I saw them plug in cat3 cables and
> > make it run at Gigabit speed (100%)!!!!!  Whoa.
> >
> > I thought that I ought to become a reseller of these things.  I
> > haven't, of course, cuz' I make so much money as a tech. coord. at my
> > small rural school (LOL) - I don't need another job.  I definately
> > wouldn't have the time for it.
> >
> > Anyway, for those of you running K12LTSP and using or thinking about
> > using Gigabit - you don't have to spend $250.000 on rewiring!  The
> > company is called wideband (i think: www.wband.com).

-- 
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Robert McDonald
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