LAN ports
Testing Conducted RF Emissions on LAN twisted-pair lines is almost
contrary to the intent of EN 55022 as Gary pointed out. Conducted
emissions is more appropriate for asynchronous analog lines.
LAN transmissions are digital and synchronous (except maybe ATM); the
receiver part of the interface circuitry locks onto the frequency of
data, rejecting spurious frequencies. The signals are truely digital,
not analog as in a modem.
Arcnet, Ethernet, and Fast Ethernet TP cabling links two points (node,
hub, switch, bridge) which digitally reconstitute the signal,
eliminating spurious cable frequencies.
Token-Ring is peer-peer, usually through a passive hub. Each node
(peer) reconstitutes the signal as above.
Ethernet, F-E and Token-Ring ANSI/IEEE or ISO/IEC physical layer
requirements define interfaces, cable lengths/type(s) and timing.
Coax cable rules for Arcnet, 10Base2 Ethernet) permit connection to
multiple nodes but again, the digital nature of the signals and the
well-defined connectivity rules prevent problems.
David
______________________________ Reply Separator
_________________________________
Subject: RE: Conducted Emissions on Telecom Ports
Author: "Gary McInturff" <SMTP:gary.mcintu...@worldwidepackets.com> at
ADEMCONET
List-Post: emc-pstc@listserv.ieee.org
Date: 9/5/2000 10:54 AM
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:c...@prodigy.net]
Sent: Thursday, August 31, 2000 6:24 AM
To: Pettit, Ghery; david_ster...@ademco.com; emc-p...@ieee.org
Subject: Re: Conducted Emissions on Telecom Ports
Confusing isn't?
----- Original Message -----
From: Pettit, Ghery <ghery.pet...@intel.com>
To: <david_ster...@ademco.com>; <emc-p...@ieee.org>; <c...@prodigy.net>
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: david_ster...@ademco.com [mailto:david_ster...@ademco.com]
> Sent: Wednesday, August 30, 2000 2:04 PM
> To: emc-p...@ieee.org; c...@prodigy.net
> 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:c...@prodigy.net> 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:c...@prodigy.net]
> > 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
> > c...@prodigy.net <mailto:c...@prodigy.net>
> > www.ctl-lab.com <http://www.ctl-lab.com>
> >
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>
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