Great Circle Associates Firewalls
(March 1996)
 

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Subject: ethernet details (rx and tx)
From: Jerry Champlin <jgc @ webspan . com>
Date: Fri, 1 Mar 1996 10:46:05 -0600 (CST)
To: firewalls @ GreatCircle . COM

This should hopefully answer most of the question about ethernet
wiring

excerpt from:

 Linux Ethernet-Howto
  Paul Gortmaker, Editor.
  v2.4, 27 May 1995


  If you are only connecting two machines, it is possible to avoid using
  a hub, by swapping the Rx and Tx pairs (1-2 and 3-6).

  If you hold the RJ-45 connector facing you (as if you were going to
  plug it into your mouth) with the lock tab on the top, then the pins
  are numbered 1 to 8 from left to right. The pin usage is as follows:


          Pin Number              Assignment
          ----------              ----------
          1                       Output Data (+)
          2                       Output Data (-)
          3                       Input Data (+)
          4                       Reserved for Telephone use
          5                       Reserved for Telephone use
          6                       Input Data (-)
          7                       Reserved for Telephone use
          8                       Reserved for Telephone use

>From my limited understanding, if you remove pin 3 and your software
will cope with no incoming data, you will solve the problem.  I think
you will still need pin 6 to make the card happy.

Hope this helps

-Jerry

***************************************************************************
       //Keep it simple; as simple as posible, but no simpler.//
                            --A. Einstein
Jerry Champlin   jgc @
 home .
 webspan .
 com   URL: http://128.101.165.26/~jerry
          home: 612-623-4699             work: 612-333-5465
***************************************************************************

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