[SI-LIST] Re: RJ-45 Connector
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Tom Dagostino" <tom@xxxxxxxxxxxxx>, "Curt McNamara" <CurtM@xxxxxxxxxxx>, "Chandupcb" <chandupcb@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Fri, 9 Jun 2006 13:46:36 -0700
Tom,
It's easy to jump to conclusion and ridicule. The reason for this
decision was, to redesign meant recertifying with a dozen other countries
with 10X the customers and the potential lost business due to delays.
The way this played out was, the regulator was removed from the
certification path and the product was certified.
Sometimes you have to have the courage to push back when things are wrong..
> [Original Message]
> From: Tom Dagostino <tom@xxxxxxxxxxxxx>
> To: <leeritchey@xxxxxxxxxxxxx>; Curt McNamara <CurtM@xxxxxxxxxxx>;
Chandupcb <chandupcb@xxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Date: 6/9/2006 11:34:33 AM
> Subject: [SI-LIST] Re: RJ-45 Connector
>
> Hmmmmmmmm, increase potential market by half the population of =
> California by
> removing copper vs. losing a whole customer base by calling a regulator =
> an
> idiot, hmmm
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
> On
> Behalf Of Lee Ritchey
> Sent: Friday, June 09, 2006 9:32 AM
> To: Curt McNamara; Chandupcb; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: RJ-45 Connector
>
>
> Curt,
>
> The creepage distance is on the surface, not internally. The internal =
> spec
> is 1700 VDC withstanding and that is achieved with only 2 mils of FR-4. =
> So,
> there is no need to clear planes that are internal to the PCB.=20
> Why do engineers globally apply specs, when they don't apply?
>
> Yes, there is one regulator person in Australia who does not understand =
> this
> and insists that planes need to be cleared. He is out to lunch! We =
> solved
> the problem by just not shipping to Australia! The whole market in
> Australia is less than half of Californina, so it wasn't much of a
> sacrifice.
>
>
> > [Original Message]
> > From: Curt McNamara <CurtM@xxxxxxxxxxx>
> > To: <leeritchey@xxxxxxxxxxxxx>; Chandupcb <chandupcb@xxxxxxxxx>;
> <si-list@xxxxxxxxxxxxx>
> > Date: 6/9/2006 9:10:42 AM
> > Subject: [SI-LIST] Re: RJ-45 Connector
> >
> > From a safety standpoint the "line side" of the RJ45 can be TNV=20
> > (tele-communications network voltages). These wires can go through=20
> > wiring cabinets where a single fault could short them to AC=20
> > (Ethernet), or could go on poles outside the building (DSL or modem).=20
> > As a result approval bodies require a transformer for isolation=20
> > between TNV and SELV. To ensure the isolation, you need to keep=20
> > minimum distances (called creepage and clearance) between these line=20
> > side signals and anything on the SELV (safety extra low voltage) side. =
>
> > In practice this requires there be no planes under the output side,=20
> > since the distance between the planes and the output traces or pins=20
> > would violate the standard. You should check with your approvals body=20
> > to ensure that the correct standard is being applied.
> >
> > Curt
> >
> > Curt McNamara. P.E.=3D20
> > Senior Electrical Engineer=3D20
> > Logic Product Development=3D20
> > 411 Washington Ave. N Suite 101=3D20
> > Minneapolis, MN 55401=3D20
> > Tel 612-436-5178=3D20
> > Fax 612-672-0443=3D20
> > curtm@xxxxxxxxxxx=3D20
> > www.logicpd.com=3D20
> > This message (including any attachments) contains confidential=20
> > information intended for a specific individual and purpose, and is=20
> > protected by law. If you are not the intended recipient, you should=20
> > delete this message and are hereby notified that any disclosure,=20
> > copying, or distribution of this message, or the taking of any action=20
> > based on it, is strictly prohibited.
> >
> >
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx=20
> > [mailto:si-list-bounce@xxxxxxxxxxxxx]
> > On Behalf Of Lee Ritchey
> > Sent: Friday, June 09, 2006 11:00 AM
> > To: Chandupcb; si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: RJ-45 Connector
> >
> >
> > Chandu,
> >
> > There is no valid reason to do this. Rules like this are often called =
>
> > elephant repellant.
> >
> >
> > > [Original Message]
> > > From: Chandupcb <chandupcb@xxxxxxxxx>
> > > To: <si-list@xxxxxxxxxxxxx>
> > > Date: 6/9/2006 3:46:00 AM
> > > Subject: [SI-LIST] RJ-45 Connector
> > >
> > > Hi Gurus,
> > > May I know why will we remove the Plane under the RJ-45=3D20=20
> > > connector.Some
> > times only chasis gnd is Allowed under the connector.
> > >
> > > Why?
> > >
> > > Regards
> > > Chandu
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