[SI-LIST] Re: RJ-45 Connector
- From: "Curt McNamara" <CurtM@xxxxxxxxxxx>
- To: <cpad@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 9 Jun 2006 12:27:34 -0500
I will admit to not having looked closely at the recommendations for
these, however ....
If the TNV pins (i.e. the Ethernet line side) are present and soldered
into the board, you would still need plane clearances around these pins
to satisfy a safety approval.=20
Curt =09
Curt McNamara. P.E.=20
Senior Electrical Engineer=20
Logic Product Development=20
411 Washington Ave. N Suite 101=20
Minneapolis, MN 55401=20
Tel 612-436-5178=20
Fax 612-672-0443=20
curtm@xxxxxxxxxxx=20
www.logicpd.com=20
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Chris Padilla (cpad)
Sent: Friday, June 09, 2006 11:41 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: RJ-45 Connector
With the integrated-magnetic RJ45s, this Hi-Pot issue is now contained
within the RJ45 and is no longer a board issue...assuming your design
can use the IntMagRJ45s. Bel, Pulse, Molex, etc. should be able to help
you here.
Chris Padilla
Cisco Systems
San Jose, CA
-----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.=3D20 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=3D20=20
> (tele-communications network voltages). These wires can go =
through=3D20=20
> wiring cabinets where a single fault could short them to AC=3D20=20
> (Ethernet), or could go on poles outside the building (DSL or=20
> modem).=3D20 As a result approval bodies require a transformer for=20
> isolation=3D20 between TNV and SELV. To ensure the isolation, you need =
> to keep=3D20 minimum distances (called creepage and clearance) between =
> these line=3D20 side signals and anything on the SELV (safety extra =
low=20
> voltage) side.
> In practice this requires there be no planes under the output =
side,=3D20
> since the distance between the planes and the output traces or =
pins=3D20
> would violate the standard. You should check with your approvals=20
> body=3D20 to ensure that the correct standard is being applied.
>
> Curt
>
> Curt McNamara. P.E.=3D3D20
> Senior Electrical Engineer=3D3D20
> Logic Product Development=3D3D20
> 411 Washington Ave. N Suite 101=3D3D20
> Minneapolis, MN 55401=3D3D20
> Tel 612-436-5178=3D3D20
> Fax 612-672-0443=3D3D20
> curtm@xxxxxxxxxxx=3D3D20
> www.logicpd.com=3D3D20
> This message (including any attachments) contains confidential=3D20=20
> information intended for a specific individual and purpose, and =
is=3D20=20
> protected by law. If you are not the intended recipient, you =
should=3D20
> delete this message and are hereby notified that any disclosure,=3D20=20
> copying, or distribution of this message, or the taking of any=20
> action=3D20 based on it, is strictly prohibited.
>
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx=3D20=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=3D3D20=3D20 =
> > connector.Some
> times only chasis gnd is Allowed under the connector.
> >
> > Why?
> >
> > Regards
> > Chandu
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