________________________________
From: jim.hulb...@pb.com [ mailto:jim.hulb...@pb.com]
Sent: Thursday, April 13, 2006 7:38 AM
To: emc-p...@ieee.org
Subject: Conducted Emissions on Ethernet
We have an ethernet port to which is connected a CAT5 cable. When this
cable is routed through an ISN per EN 55022 for conducted emissions
measurements, the port is unable to function. What experience have people had
with ISNs in this application, or what experience do people have with the
alternate test methods (current probe and/or voltage probe measurements)?
We are trying to establish a test procedure that yields repeatable
measurements and hopefully measurements that are correlatable to what other
labs may measure.
Thank you.
Jim Hulbert, Principal Engineer
GMSE/TSO/Compliance Engineering
Pitney Bowes
Jim:
A few weeks ago, I almost had to face trying to filter an Ethernet cable. My
first attempt was to use an Quell EESeal connector insert filter, with a
capacitance of 5000 pF from each pin to ground. This produced too much loading
(desired signal reduction), and the Ethernet link would not function. So, the
only little fact I can add is that 5000 pF (to ground) is too capacitance for
the Ethernet interface.
Ed Price
ed.pr...@cubic.com WB6WSN
NARTE Certified EMC Engineer & Technician
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (Fax)
Military & Avionics EMC Is Our Specialty
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