Note athat about 99.999% of copper 100MBethernet is 100base-TX. Basically
100base-T4 was an early experiment that more or less flopped.

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Brendan Moran" <bmoran@MILLENNIUM.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, July 11, 2002 4:18 PM
Subject: Re: [EE]: 4 wires to make a net cable with j45?


> > Well, you can be as emphatic as you want to be, but there are plenty of
10
> > and 100 Mbps ethernets running on two pairs (much of mine included).
>
> I'll start by assuming you're correct, because now, I am truly confused.
>
> Well, after some checking, I have found an answer.  We're both right.
> 100base-T4 is 4 pair telephone cable, while 100base-TX (which I assume
> you're using) is 2 pair data grade cable.
>
> This information:
>
> "In 100 Mbps (megabits per second) Ethernet (known as Fast Ethernet),
there
> are three types of physical wiring that can carry signals:
>
> 100BASE-T4 (four pairs of telephone twisted pair wire)
> 100BASE-TX (two pairs of data grade twisted-pair wire)
> 100BASE-FX (a two-strand optical fiber cable) "
>
> was found at
>
http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci211490,00.html
>
> Well, good to have cleared that up.
>
> --Brendan
>
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