Re: RCV Only Cable for 100Base-T

["Joe Pampel" <joe () ardsley com>]

Hi Erek:

#2 is an interesting solution - the inline capacitor rolls off the data freq and mangles the signal... easier than 
putting in a 100ft + (or whatever) cable. I would have tried a LPF first, but maybe that kills the "link" signal.. 
Being an electric geek of sorts (tubes mostly these days though) I will look into the basic design of NIC cards and see 
if there isn't a simple way to bunge a common NIC (say an E100B/i82550 based) by cutting a PCB trace or something. I 
suspect the data and the "I'm alive" signal come from different pins on the chip.. at least that's my hope!
Building a NIC (if necc) might not even be that bad (joints like Mouser sell plug in proto boards and the steel end 
brakets, cat 5 sockets, etc.).. famous last words?  Maybe it's really tough, but I'm hoping we all get a break on this 
one and find the easy way.
This would be great for syslog servers, etc as well.

Thx,

- Joe

ps: if anyone has already been down this road and wants to save me gas and tolls, gimme a yell! :-) 

Message: 3
Date: Sun, 2 Dec 2001 02:06:59 -0800 (PST)
From: Erek Adams <erek () theadamsfamily net>
To: Got Snort? <snort-users () lists sourceforge net>
Subject: [Snort-users] R/O Cable links


I ran across a couple of good links on R/O cables.  Anyone have any thoughts
on these pages?

The original:

http://www.robertgraham.com/pubs/sniffing-faq.html#receive-only 

And a different spin:

http://personal.ie.cuhk.edu.hk/~msng0/sniffing_cable/index.htm 

-----
Erek Adams
Nifty-Type-Guy
TheAdamsFamily.Net


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