RE: Ethernet Line Tuning

["Walden H. Leverich" <WaldenL@xxxxxxxxxxxxxxx>]

>I just made my first cable a couple weeks ago,

Why? Patch cables are cheap enough these days that I long ago gave up making
my cables. Can you get it right, sure, but is it worth the $1/cable savings?
Doubt it.

>I can't imagine trying to skip a couple by using only 4.

Actually it's easier. You have only 1/2 the wires to deal with. (But as I
said above, I wouldn't do it)

>I guess you can use flat phone cable...

Only if you want 10Mb 1/2 duplex and even then you'll get a lot of errors on
the line. The twists are necessary to reduce/eliminate RF interference,
especially at the higher speeds.

-Walden


------------
Walden H Leverich III
President
Tech Software
(516) 627-3800 x11
(208) 692-3308 eFax
WaldenL@TechSoftInc.com
http://www.TechSoftInc.com

Quiquid latine dictum sit altum viditur.
(Whatever is said in Latin seems profound.)



-----Original Message-----
From: Vernon Hamberg [mailto:vhamberg@attbi.com]
Sent: Friday, August 09, 2002 08:13
To: midrange-l@midrange.com
Subject: RE: Ethernet Line Tuning


I just made my first cable a couple weeks ago, so I'm no expert (I'm a new
spurt <g>). Considering how it's messy enough getting all 8 wires in the
right places of an RJ-45 connector, I can't imagine trying to skip a couple
by using only 4. It just seems easier to use them all with a CAT5 cable. I
guess you can use flat phone cable, to save money, but it's probably not
worth it, IMO.

At 08:07 AM 8/9/02 -0400, you wrote:
> >From: Chris Bipes
>
> >Really.  I learn something new every day.   Do you have a link available
to
> >read what pairs are actually needed for 100 Full?  Or post the specs
> >here.
>
>The posted link described the order of the wires, but I didn't see the
>description of which pairs are actually used.  In case you are curious,
>it's pins 1, 2, 3, and 6 (basically the orang and green pairs.)  Some
>cables are made with only those four wires connected.  I personally use
>all 8 because you never know when you may need that cable for a dumb
>terminal (pins 4 and 5 on our baluns) or something else.

_______________________________________________
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list
To post a message email: MIDRANGE-L@midrange.com To subscribe, unsubscribe,
or change list options,
visit: http://lists.midrange.com/cgi-bin/listinfo/midrange-l
or email: MIDRANGE-L-request@midrange.com
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.