If all else fails, you could used shielded Ethernet cable with a connector
that makes ground contact.
Don Borowski
Schweitzer Engineering Labs
Pullman, WA, USA
"Price, Ed"
<[email protected]
om> To
Sent by: [email protected]
[email protected] cc
Subject
02/28/2006 06:21 Ethernet Decoupling
AM
I have a twisted-pair Ethernet receive and a twisted-pair Ethernet transmit
set of 4 wires penetrating what would otherwise be a shielded box. Internal
box noise, as low as 35 MHz, is getting out along this path.
I put a 4700 pF feedthrough capacitor on each of the four lines. That
worked pretty well, so well that the Ethernet shut down. Does anyone have a
guideline about how much capacitance, L-L & L-G, that is typically OK?
Thanks in advance!
Ed Price
[email protected] 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
- ---------------------------------------------------------------- This
message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to [email protected]
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas [email protected] Mike Cantwell [email protected]
For policy questions, send mail to:
Jim Bacher: [email protected] David Heald: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
This e-mail may contain SEL confidential or
legally privileged information. The opinions
expressed are not necessarily those of SEL.
Any unauthorized disclosure, distribution or
other use is prohibited. If you received this
e-mail in error, please notify the sender,
permanently delete it, and destroy any
printed copies.
-
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. Website: http://www.ieee-pses.org/
To post a message to the list, send your e-mail to [email protected]
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas [email protected]
Mike Cantwell [email protected]
For policy questions, send mail to:
Jim Bacher: [email protected]
David Heald: [email protected]
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
