Ken, that is not what Mike is saying. Mike's statment was to the effect
that if the noise can get out of the EUT then noise from another source can
get in. A point of exit can also be a point of entry for EMI. This applies
to all types of launching mechanisms, not just cables. Also, just because a
piece of equipemnt is passing CE or any emissions does not guarrenty that it
will not cause a problem with other equipment. Coupling between adjacent
cabling can cause EMC issues even if both unit pass CE. Primarily, all
emissions limits, CE and RE, exist to provide a level of protection for
communitcations over the air. Equipment protection is secondary. Keeping
equipment clean at the source goes a long way to protect it from outside
influences.
Guy Story, KC5GOI
Compliance Technician
Interphase Corporation
Dallas Texas
phone: 214.654.5161
fax: 214.654.5406
----- Original Message -----
From: "Ken Javor" <ken.ja...@emccompliance.com>
To: <michael.sundst...@nokia.com>; <paolo.ronc...@compuprint.it>;
<eric.lif...@ni.com>
Cc: <emc-p...@ieee.org>
Sent: Thursday, September 07, 2000 10:17 PM
Subject: Re: R: Conducted Emissions on Telecom Ports
So you are saying that an emission limit was imposed to improve immunity of
the self-same equipment? I have to go on record disagreeing with that
interpretation. As for protection of nearby circuits, my guess is that if
you calculate coupling from a cable just meeting your telecom port CE limit
to an adjacent cable, you will find that even common mode coupling is orders
of magnitude below the intentional signal carried in the adjacent victim
cable. I say this in full ignorance of just what that CE limit is, since I
know that a CE limit designed to protect against rfi will more than protect
against cable-to-cable coupling.
----------
>From: michael.sundst...@nokia.com
>To: ken.ja...@emccompliance.com, paolo.ronc...@compuprint.it,
eric.lif...@ni.com
>Cc: emc-p...@ieee.org
>Subject: RE: R: Conducted Emissions on Telecom Ports
>Date: Thu, Sep 7, 2000, 5:01 PM
>
> Actually it's to reduce interference to one's own equipment, (if it emits
it
> - it's also susceptible to it). It also has the effect of reducing
> interference to other near by equipment.
>
>
> Michael Sundstrom
> Nokia Mobile Phones, PCC
> EMC Technician
> cube 4E : 390B
> phone: 972-374-1462
> mobile: 817-917-5021
> michael.sundst...@nokia.com
> amateur call: KB5UKT
>
>
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