: RE: [PSES] Shield bonding on STP Cat5 Ethernet cables
As I said in other posts, my RS485 interfaces are isolated.
My positive experience has been with EMI testing specifically IEC
61000-4-4 and -6 tests where I push to level 4 and beyond. A cap
referenced shield does wonders.
I also bias
[mailto:g.grem...@cetest.nl]
Sent: Monday, November 29, 2010 6:58 AM
To: Chris Wells; EMC-PSTC@LISTSERV.IEEE.ORG
Cc: christopherdwe...@eaton.com
Subject: RE: [PSES] Shield bonding on STP Cat5 Ethernet cables
Your positive experiences with RS485 are almost certainly based
on problematic equipment. RS 485
...@intel.com; j...@jmwa.demon.co.uk; EMC-PSTC@LISTSERV.IEEE.ORG;
Derek Walton
Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables
I had one of those too! Took a lot of money and time to correctly re-wire the
AC mains to building complex. Then all worked as expected, and the shields
became
PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables
In message
9d04b979323dcd428297dda95108893e045ff...@bb-corp-ex2.corp.cubic.cub,
dated Mon, 29 Nov 2010, Price, Edward ed.pr...@cubic.com writes:
Well John, I don?t think we can guess about
-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables
I would think this indicated a fault condition, and needed fixing. It's not an
operating condition.
I wonder how the ELCB's cope with that?
Cheers,
Derek.
-Original Message-
From: Pettit, Ghery
Walton lfresea...@aol.com wrote:
From: Derek Walton lfresea...@aol.com
Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables
To: ghery.pet...@intel.com, j...@jmwa.demon.co.uk,
EMC-PSTC@LISTSERV.IEEE.ORG
Date: Monday, November 29, 2010, 2:28 PM
In message
9d04b979323dcd428297dda95108893e045ff...@bb-corp-ex2.corp.cubic.cub,
dated Mon, 29 Nov 2010, Price, Edward ed.pr...@cubic.com writes:
Well John, I don?t think we can guess about the current level, because
it all depends on the source impedance driving that 9-Volt
differential.
EMC-PSTC@LISTSERV.IEEE.ORG
Sent: Mon, Nov 29, 2010 1:18 pm
Subject: RE: [PSES] Shield bonding on STP Cat5 Ethernet cables
I've seen 60V 60 Hz between two ground systems in the US. Drew a nice arc off
the ground clip of a scope when it was plugged into an outlet on one ground
system
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John
Woodgate
Sent: Monday, November 29, 2010 11:09 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables
In message 8cd5e0cbb14a33c-c3c-...@webmail
.
Ghery S. Pettit
-Original Message-
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate
Sent: Monday, November 29, 2010 11:09 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables
In message 8cd5e0cbb14a33c-c3c
In message 8cd5e0cbb14a33c-c3c-...@webmail-m092.sysops.aol.com, dated
Mon, 29 Nov 2010, Derek Walton lfresea...@aol.com writes:
Agreed John, it CAN... but not under normal conditions. Quite honestly,
under fault conditions if that situation arises I'd be looking for
other more serious problems
To: EMC-PSTC@LISTSERV.IEEE.ORG
Sent: Mon, Nov 29, 2010 10:27 am
Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables
In message 8cd5de54dc93751-d50-2d...@webmail-m092.sysops.aol.com, dated Mon,
29 Nov 2010, Derek Walton lfresea...@aol.com writes:
This is really a problem for Audio
In message 8cd5de54dc93751-d50-2d...@webmail-m092.sysops.aol.com,
dated Mon, 29 Nov 2010, Derek Walton lfresea...@aol.com writes:
This is really a problem for Audio, and not really an Ethernet issue
unless you go long distances.
It CAN be a problem with ANY shield grounded at both ends. Ground
...@comcast.net
To: EMC-PSTC@LISTSERV.IEEE.ORG
Cc: christopherdwe...@eaton.com
Sent: Sun, Nov 28, 2010 7:48 pm
Subject: RE: [PSES] Shield bonding on STP Cat5 Ethernet cables
Thanks all
I've received some good feedback on this topic.
Seems that most of you don't see a lot of value in SHIELDED - STP Cat 5
@LISTSERV.IEEE.ORG
CC: christopherdwe...@eaton.com
Onderwerp: RE: [PSES] Shield bonding on STP Cat5 Ethernet cables
Thanks all
I've received some good feedback on this topic.
Seems that most of you don't see a lot of value in SHIELDED - STP Cat 5
cable over well balanced UTP. I understand the value
In message 10155C8E66AF436D9B19589324201ACD@christopher, dated Sun, 28
Nov 2010, Chris Wells radioactive55...@comcast.net writes:
I would not expect that there would be any significant ground loops
between local nodes.
Considering your description of the environment, I certainly WOULD
expect
25, 2010 12:34 PM
To: j...@jmwa.demon.co.uk
Cc: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Shield bonding on STP Cat5 Ethernet cables
A magnetic field will couple through the shield even if grounded at both
ends, albeit in attenuated form. It's really just a matter of how much
attenuation can
A magnetic field will couple through the shield even if grounded at both
ends, albeit in attenuated form. It's really just a matter of how much
attenuation can be achieved. I've been working on an instrument with a
pulsed magnetic field powerful enough to cause robust electrostimulation
of any
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