If LAN's cause interference, the mechanism would be radiated, not
conducted. Testing may be moot on LAN's whose fundimental frequency
lies between 150kHz and 100MHz; STP is the only way to 'pass'.
Of course STP has safety implications due to earthing potentials.
David
______________________________ Reply Separator
_________________________________
Subject: RE: Conducted Emissions on Telecom Ports
Author: "Mowbray; John H" <SMTP:[email protected]> at
ADEMCONET
List-Post: [email protected]
Date: 9/5/2000 12:06 PM
Gary
If you read the definition of telecomm ports in CISPR 22 (sect. 3.6) it
includes Local Area Networks, and other similar networks. Some people have
even tried to extend this to RS 232 because of past abuses of this interface
(like stretching the cable length to several hundred feet).
There is a great concern in some European Countries that LAN cables can
cause interference.
John Mowbray
-----Original Message-----
From: Gary McInturff [SMTP:[email protected]]
Sent: Tuesday, September 05, 2000 10:55 AM
To: 'Pryor McGinnis'; Pettit, Ghery; [email protected];
[email protected]
Subject: RE: Conducted Emissions on Telecom Ports
Define telecom port.
A LAN port isn't neccessarily a LAN port. Ethernet ports do
not
connect directly to the Telecommunications network - a necessary
condition
before being a telecommunications port. LANS and MANS operate all of
the
time without any use of any telecommunications equipment. Generally,
Ethernet or Fast Ethernet for short distances and Gig Ethernet for
longer
distances. IF -- the telecommunications lines are needed there is
some sort
of "bridge" that takes the ethernet and its digitized Voice over
Internet
Protocol (Voip) and does all of the phone stuff and makes the actual
metallic connection. That "birdge" has the only telecommunication
ports on
it.
Gary
-----Original Message-----
From: Pryor McGinnis [mailto:[email protected]]
Sent: Thursday, August 31, 2000 6:24 AM
To: Pettit, Ghery; [email protected]; [email protected]
Subject: Re: Conducted Emissions on Telecom Ports
Confusing isn't?
----- Original Message -----
From: Pettit, Ghery <[email protected]>
To: <[email protected]>; <[email protected]>;
<[email protected]>
Sent: Wednesday, August 30, 2000 5:40 PM
Subject: RE: Conducted Emissions on Telecom Ports
> Actually, it's August 1, 2001 as posted in the OJ on January 25th
of this
> year. You've got 1 less month to start testing to the new
standard.
>
> Ghery Pettit
> Intel
>
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> Sent: Wednesday, August 30, 2000 2:04 PM
> To: [email protected]; [email protected]
> Subject: RE: Conducted Emissions on Telecom Ports
>
>
>
> The date of withdrawal of EN 55022:1998 is September 1, 2001.
Look
at
> the NIC manual's DofC --- the mfgr. may not be declaring
compliance
to
> conducted emissions yet.
>
>
> ______________________________ Reply Separator
> _________________________________
> Subject: Re: Conducted Emissions on Telecom Ports
> Author: "Pryor McGinnis" <SMTP:[email protected]> at ADEMCONET
> Date: 8/30/2000 10:31 AM
>
>
> Hello All,
>
> The question originated from a manufacturer of LAN boards who
sells to end
> users and to manufacturer's who integrate the LAN boards into end
products.
>
> I advised the LAN board manufacturer that conducted emissions
would be
> required (with boards installed in typical host) on all LAN boards
sold to
> end users and manufacturers of products that integrated LAN boards
should
> test the ports for conducted emission in their end product. The
LAN board
> manufacturer questioned double testing of the LAN boards. His
concern is
> that boards that pass CE in a typical host may not pass in
another
> manufacturer's end product (rub of the green). The LAN Board
manufacturer
> ask for second opinions.
>
> Many thanks for your answers.
>
> Best Regards,
> Pryor
>
> > -----Original Message-----
> > From: Pryor McGinnis [SMTP:[email protected]]
> > Sent: Tuesday, August 29, 2000 12:35 PM
> > To: emc-pstc
> > Subject: Conducted Emissions on Telecom Ports
> >
> > Below is a message from a non emc-pstc member.
> >
> > If a manufacturer purchases LAN boards which have been tested
for
> > conducted emissions in a host, is the manufacturer required to
retest
the
> > LAN Ports for conducted emissions if the manufacturer sells his
product
> with
> > the LAN board installed?
> >
> > I am very interested in your comments.
> >
> >
> > Best Regards,
> > Pryor McGinnis
> > [email protected] <mailto:[email protected]>
> > www.ctl-lab.com <http://www.ctl-lab.com>
> >
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>
>
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