From owner-freebsd-hardware  Wed Jul  5 11: 4: 9 2000
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To: "Jason" <jsmethers@pdq.net>
Cc: freebsd-hardware@FreeBSD.ORG
Subject: Re: RJ45 
In-Reply-To: Message from "Jason" <jsmethers@pdq.net> 
   of "Mon, 03 Jul 2000 21:24:40 CDT." <005f01bfe55f$0b18ed20$73ce1f40@pdq.net> 
Date: Wed, 05 Jul 2000 14:04:03 -0400
From: Mitch Collinsworth <mkc@Graphics.Cornell.EDU>
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>> > 1 and 2 should be a pair, and 3 and 6 should be a pair.  The rest
>> > don't matter.
>>
>> ...unless you're doing Gigabit Ethernet over copper, which uses all 8
>> wires.
>>
>
>... or you want fully standards compliant cables. The other pairs should
>also be properly connected so they may be terminated and reduce any
>potential cross talk. But anyone who designs and installs quality networks
>doesn't cut corners, right?

You don't need to connect and terminate the other pairs if you're not
using them.  And if you're not using them you don't need a 4-pair cable.
I've seen plenty of 2-pair cables that run BaseT ethernet just fine.
Are you expecting cross-talk on non-existant pairs?

-Mitch


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