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From: Ken Javor ken.ja...@emccompliance.com
To: Stone, Richard A (Richard) rsto...@lucent.com; 'Knighten, Jim L'
jk100...@teradata-ncr.com; emc-p...@majordomo.ieee.org
Sent: Wednesday, March 05, 2003 11:10 PM
Subject: Re: Ethernet coax connection
Thanks to all who
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From: Georg M. Dancau [mailto:g.m.dan...@dancau.de]
Sent: Sunday, March 09, 2003 1:16 PM
To: Ken Javor; emc-p...@majordomo.ieee.org
Subject:Re: Ethernet coax connection
Hi Group,
I watched this interesting thread and noticed that none of you recalled the
susceptibility
Nute [mailto:ri...@sdd.hp.com]
Sent: Wednesday, March 05, 2003 4:31 PM
To: Knighten, Jim L
Cc: ken.ja...@emccompliance.com; emc-p...@majordomo.ieee.org
Subject: Re: Ethernet coax connection
Hi Jim:
It is a potential shock hazard if the coax run is long and runs from
Email: charles.gra...@echostar.com;
Email Alternate: chasgra...@ieee.org
From: Knighten, Jim L [mailto:jk100...@teradata-ncr.com]
Sent: Thursday, March 06, 2003 10:17 AM
To: john...@itesafety.com
Cc: emc-p...@majordomo.ieee.org
Subject: RE: Ethernet coax connection
I knew that I was headed
ANSI/IEEE 802.3 specifies 10Base2 earthing at some point along the cable,
but not at any node. 10Base2 nodes typically are an isolated (DC/DC + level
shifter) 9-volt part of the PBWA with a high resistance connection to
chassis.
[RF radiation is higher and RF immunity is lower than 10BaseT.
:12 PM
To: Ken Javor; emc-p...@majordomo.ieee.org
Subject: RE: Ethernet coax connection
Ken,
It is a potential shock hazard if the coax run is long and runs from
building to building (for instance) where the ground potentials may be
different in the different buildings. One can develop
]
Sent: Wednesday, March 05, 2003 9:53 PM
To: Knighten, Jim L
Cc: emc-p...@majordomo.ieee.org
Subject:RE: Ethernet coax connection
File: Robert Johnson.vcf If you have shock level differences between
the grounds in two different
buildings, either an entire building isn't
I read in !emc-pstc that Knighten, Jim L jk100...@teradata-ncr.com
wrote (in 61A60D883863D411A36600D0B785B50C0D8C6EC0@susdayte51.daytonoh.
ncr.com) about 'Ethernet coax connection' on Wed, 5 Mar 2003:
One can develop a large potential on
the shield of the cable, so that if you put yourself
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of Knighten, Jim L
Sent: Wednesday, March 05, 2003 7:51 PM
To: Rich Nute
Cc: ken.ja...@emccompliance.com; emc-p...@majordomo.ieee.org
Subject: RE: Ethernet coax connection
Rich,
I think you must be correct
Nute [mailto:ri...@sdd.hp.com]
Sent: Wednesday, March 05, 2003 4:31 PM
To: Knighten, Jim L
Cc: ken.ja...@emccompliance.com; emc-p...@majordomo.ieee.org
Subject:Re: Ethernet coax connection
Hi Jim:
It is a potential shock hazard if the coax run is long and runs from
: Wednesday, March 05, 2003 1:09 PM
To: Robert Macy; emc-p...@ieee.org
Subject:Re: Ethernet coax connection
If all the ac equipment is powered by the same local source, and all the ac
powered equipment is case-grounded within the same rack, is it correct to
assume that the safety issue is moot
]
Sent: Wednesday, March 05, 2003 4:12 PM
To: Ken Javor; emc-p...@majordomo.ieee.org
Subject: RE: Ethernet coax connection
Ken,
It is a potential shock hazard if the coax run is long and runs from
building to building (for instance) where the ground potentials may be
different in the different
]
Sent: Wednesday, March 05, 2003 12:58 PM
To: Knighten, Jim L; emc-p...@majordomo.ieee.org
Subject:Re: Ethernet coax connection
Assume complete ignorance on my part. What is the safety concern?
on 3/5/03 3:50 PM, Knighten, Jim L at jk100...@teradata-ncr.com wrote:
Ken,
Safety
: 858-485-2537
Fax: 858-485-3788
jim.knigh...@ncr.com
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Wednesday, March 05, 2003 12:58 PM
To: Knighten, Jim L; emc-p...@majordomo.ieee.org
Subject: Re: Ethernet coax connection
Assume complete ignorance
If all the ac equipment is powered by the same local source, and all the ac
powered equipment is case-grounded within the same rack, is it correct to
assume that the safety issue is moot? That is, can I then use a grounded
bnc connector at both ends?
on 3/5/03 4:02 PM, Robert Macy at
Assume complete ignorance on my part. What is the safety concern?
on 3/5/03 3:50 PM, Knighten, Jim L at jk100...@teradata-ncr.com wrote:
Ken,
Safety considerations are the reason for the spec requirement. You are
allowed to ground the shield at one point.
Try using a BNC coax
Ken,
Safety considerations are the reason for the spec requirement. You are
allowed to ground the shield at one point.
Try using a BNC coax connector with a built-in capacitor to ground. That
gives you an AC connection to ground and is often quite effective. These
are off-the-shelf parts.
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