[SI-LIST] Re: RJ-45 Connector
- From: Joel Brown <joel@xxxxxxxxxx>
- To: CurtM@xxxxxxxxxxx
- Date: Fri, 09 Jun 2006 10:57:04 -0700
From what I have seen the the TNV pins are internal to the RJ45 jack and
arenot accessible to the board.
Joel
Curt McNamara wrote: 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[1]
www.logicpd.com=20[2] This message (including any attachments) contains
confidential information intended for a specific individual and purpose, and
is protected by law. If you are not the intended recipient, you should
deletethis message and are hereby notified that any disclosure, copying, or
distribution of this message, or the taking of any action based on it, is
strictly prohibited. -----Original Message----- From:
si-list-bounce@xxxxxxxxxxxxx[3] [mailto:si-list-bounce@xxxxxxxxxxxxx[4]] On
Behalf Of Chris Padilla (cpad) Sent: Friday, June 09, 2006 11:41 AM To:
si-list@xxxxxxxxxxxxx[5] Subject: [SI-LIST] Re: RJ-45 Connector With the
integrated-magnetic RJ45s, this Hi-Pot issue is now contained within the
RJ45and 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[6] [mailto:si-list-bounce@xxxxxxxxxxxxx[7]] On
Behalf Of Lee Ritchey Sent: Friday, June 09, 2006 9:32 AM To: Curt McNamara;
Chandupcb; si-list@xxxxxxxxxxxxx[8] 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
ofCalifornina, so it wasn't much of a sacrifice. [Original Message] From:
Curt McNamara <CurtM@xxxxxxxxxxx>[9] To: <leeritchey@xxxxxxxxxxxxx>[10];
Chandupcb <chandupcb@xxxxxxxxx>[11]; <si-list@xxxxxxxxxxxxx>[12] 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).=3D20As 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[13] www.logicpd.com=3D3D20[14] This message
(including any attachments) contains confidential=3D20=20 information
intended for a specific individual and purpose, and = is=3D20=20 protected
bylaw. 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[15]
[mailto:si-list-bounce@xxxxxxxxxxxxx[16]] On Behalf Of Lee Ritchey Sent:
Friday, June 09, 2006 11:00 AM To: Chandupcb; si-list@xxxxxxxxxxxxx[17]
Subject: [SI-LIST] Re: RJ-45 Connector Chandu, There is no valid reason to
dothis. Rules like this are often called elephant repellant. [Original
Message] From: Chandupcb <chandupcb@xxxxxxxxx>[18] To:
<si-list@xxxxxxxxxxxxx>[19]Date: 6/9/2006 3:46:00 AM Subject: [SI-LIST]
RJ-45Connector 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
theconnector. Why? Regards Chandu
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