On Sat, 02 Sep 2006 11:48:13 -0500, Mike Niswonger wrote:
>Try switching out the wall wart power supply.
Yes. I include these power supplies in the list of potentially
bad boxes. Also, try using ferrite chokes to suppress radiation
from the power supply leads. The trash on the power leads can
originate either on the Ethernet box or the power supply (or
both).
Another solution is to have one suitably-sized linear supply
trickle-charging a battery that runs the gear. I'm gradually
adopting this strategy as an alternative means of UPS for my
computer networking infrastructure. In addition to the obvious
noise reduction possibilities, conventional UPS units are power
hogs. I've become quite conscious of this after moving from
Chicago where I paid $0.10/kWh, to California, where I'm paying a
graduated rate that hits $0.35/kWh.
Jim Brown K9YC
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