Our 100BaseTX Ethernet passed RF conducted immunity at UL-Melville using the
Fischer interface. We had no trouble getting a 'link' on the EUT and the AE
(an Ethernet switch).
Caution:
Some ferrite 'magic bullits' sold for Ethernet cause 'cable-length'
sensitivity (non-communication at some cable lengths). An Ethernet
compatibility test lab discovered the sensitivity; we did not investigate the
root cause (collision detect, warp of the 'eye', etc.), failing IEEE 802.3
itself justifies rejection of the ferrite. Introducing a non-ANSI/IEEE 802.3
compliant ISN/CDN purturbs the Ethernet transmission line performance and may
aggrevate the cable-length sensitivity.
_ 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 <http://www.honeywell.com/> >
[email protected]
<http://www.IEEE.LI <http://www.ieee.li/> >
Electromagnetic Compatibility
IEEE 05888136
_____
From: [email protected] [mailto:[email protected]] On Behalf Of Larry Stillings
Sent: Friday, May 18, 2007 4:01 PM
To: 'Pettit, Ghery'; [email protected]; [email protected]; [email protected]
Subject: RE: EN 55022:1998+A!+A2 vs EN 55022:2006
Ghery,
I need to ask about this one. All of the CDN / ISN adapters I have used
including R&S, Fischer & Schaffner 4-Wire ISN/CDNs all have coupling networks
for 4 interfaces and are labelled for E1, Ethernet, ISDN, etc., so you are
saying the intent of CISPR 22 was to have all those interfaces tested with an
Eight Wire ISN? This is news to me, how many others on this list? Thanks.
Larry Stillings
_____
From: Pettit, Ghery [mailto:[email protected]]
Sent: Friday, May 18, 2007 3:49 PM
To: [email protected]; [email protected]; [email protected]
Subject: RE: EN 55022:1998+A!+A2 vs EN 55022:2006
CISPR 22 requires that you use an ISN based on the number of wires in the
cable, not the number actually being used. All Ethernet tests should be done
with an 8 wire ISN as Cat 3, Cat 5 and Cat 6 cables all have 8 wires.
Ghery
_____
From: [email protected] [mailto:[email protected]]
Sent: Friday, May 18, 2007 12:35 PM
To: Pettit, Ghery; [email protected]; [email protected]
Subject: Re: EN 55022:1998+A!+A2 vs EN 55022:2006
Hi Ghery,
It is a two balanced pair ISN, so of course Gigabit Ethernet will not
function, but I had trouble with 100 Mbps working through the ISN. I couldn't
get a ping through it, so the probes were used instead. Maybe a newer 8 wire
ISN will do the job.
Thanks,
Tim
_____
See what's free at AOL.com <http://www.aol.com?ncid=AOLAOF00020000000503> .
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