Has anyone tested RF-conducted emissions on Power-Over-Ethernet? It
uses 8 lines, but 4 lines are DC.
What were the results?
_ Honeywell
David W. Sterner
Quality Assurance Engineering
Security & Custom Electronics
165 Eileen Way
P.O. Box 9035
Syosset, NY 11791
Phone: (516) 921-6704 x6970
Fax # (516) 364-6953
[email protected]
<http://www.honeywell.com>
[email protected]
<http://www.IEEE.LI>
Electromagnetic Compatibility
IEEE 05888136
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Monday, May 21, 2007 8:26 PM
To: [email protected]
Subject: Re: EN 55022:1998+A!+A2 vs EN 55022:2006
Their recommendation puzzles me as well. I believe it comes from not
understanding how Ethernet front-end is designed. Ghery is actually the
first person in ALL my discussions on this subject who points out what I
think is correct.
I still do not think ISN/CDN is appropriate and I do not get why V-clamp
and I-clamp method would only be alternative and why ISN would prevail
in case of dispute, especially since using the clamps can only overtest
and never undertest, although you can often experience higher
***apparent*** emission with ISN than with the clamps - which does not
make sense unless something is wrong - and I believe it is.
Neven
-------------- Original message --------------
From: [email protected]
Hi Neven,
I have talked to a manufacturer of the TLISNs and they
recommended using a two balanced pair for 10/100 Ethernet and four
balanced pair for Gigabit. The two balanced pair will accept 8 wires
but only 4 of them go through the network while the others are passing
straight through. It makes sense to me to use the 4 balanced pair for
all Ethernet. Ghery pointed out that the TLISN is decided by how many
wires the cable has and not the number of wires used. Why would they
suggest a two balanced pair unit for 10/100 when all the Ethernet cables
have 8 wires?
Thanks,
Tim Pierce
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