Great Circle Associates Firewalls
(March 1996)
 

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Subject: Re: FW: rx but no tx wiring for ethernet
From: David Loysen <dwl @ hnc . com>
Date: Fri, 01 Mar 1996 08:41:58 -0800
To: firewalls @ greatcircle . com

At 09:57 AM 3/1/96 GMT, you wrote:
>
>Soembody will probably correct me, but I think the twisted pair standard   
>says that for 10Mb ethernet, the blue and brown pairs are not used. Of   
>the orange and green pairs, one is tx, one is rx (thats wires 1&2, 3&6).   
>I'm not sure which is which, but breaking one of those should make it   
>receive-only.
>
>I dont know if it can be done with ethernet because of it being a   
>contention kinda thing but is it posible to make a twisted-pair cable to   
>only receive?
>
>I played around with the wiring but could not get it to work.  Maybe it   
>depends on what brand of card?
>

This is (I think) right. But I'll bet there isn't a standard ethernet driver
around that would work in this configuration. Dosen't mean you couldn't find
or write one.

Just curious, why do you want to do this?????


=====================================
It's warm and sunny here in southern california,
just like it always is.

What's it like where you are?


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