On Mar 8, 2010, at 8:56 AM, Herbert Graf wrote:

> I want to build something that will count the number of bytes on an  
> Ethernet line.

I have a device someone gave me that measures ethernet traffic.  I'm  
pretty sure it consists entirely of analog electronics and does  
something along the lines of measuring the average voltage on the coax  
(it IS that old...)

Be aware that a passive device on a modern ethernet will probably  
receive ONLY the broadcast (and maybe multicast) packets from the  
"backbone."  Since the ethernet fabric tends to be switched, the  
packets that show up at a 10baseT connector are frequently only the  
packets that "need" to be received by that device.

BillW

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