On 25 Mar 2009 at 21:47, neve...@comcast.net wrote:
Does it matter for the discussion that:
1) Power is not present at the output of the source unless
the other side of the cable connects to a PD (powered
device) which signals to the sourcing equipment it is a PD
and to turn it on. If you
On 26 Mar 2009 at 9:00, Umbdenstock, Don wrote:
My apologies for thinking out loud “if a PD can present up
to a 13 W load, then the 25k handshake cannot be part of the
load, but rather is restricted to a handshake circuit. So
the question is whether there is a spec for current limiting
for
On 25 Mar 2009 at 23:17, Ron Pickard, RPQ wrote:
Hi Don,
Further to what Joe has stated below, according to IEC
60950-1 an ethernet interface circuit is generally
characterized as an SELV circuit, but must also be
considered a TNV-1 circuit if it is subject to overvoltages
(atmospheric
Are you using it on an OATS or in a chamber?
Don
561 912 6440
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Grace Lin
Sent: Wednesday, March 25, 2009 9:51 AM
To: emc-p...@ieee.org
Subject: Comb Generator
Dear Members,
If you know
Hi,
could someone share any experience in going through regulatory for car power
adapter: 11V-24VDC to 12V1ADC. No USB or other interfaces, just simple DC to
DC regulator.
I have looked at some SAE standards or EU EMC Directive/standards, but they
are mostly for active devices. Will be
Mark,
You can find all EU automotive requirements here
http://globalcompliance.blogspot.com
Click on the link for Europe - Motor Vehicle Regulations
Best Regards,
Peter
--- On Wed, 3/25/09, Mark Gandler markgand...@hotmail.com wrote:
From: Mark Gandler markgand...@hotmail.com
Does it matter for the discussion that:
1) Power is not present at the output of the source unless the other side of
the cable connects to a PD (powered device) which signals to the sourcing
equipment it is a PD and to turn it on. If you unplug the PD, the power goes
off.
2) The power supply
Let me share some of my thought process with you.
Hazard based consideration and 60950 would suggest that if a power
source (injector) can provide more than 15W, then a fire enclosure or
other means of fire protection is necessary. Other means to prevent
fire when a fire enclosure is not
Hi Pat,
LPS means limited power source per 60950 Clause 2.5; this is the basis
of my question.
Don
561 912 6440
From: pat.law...@slpower.com [mailto:pat.law...@slpower.com]
Sent: Wednesday, March 25, 2009 12:14 PM
To: Umbdenstock, Don
Cc: emc-p...@ieee.org
Subject: Re: PoE injectors
Hi Don,
Hello Mark,
For North America, use UL 2089.
http://ulstandardsinfonet.ul.com/scopes/scopes.asp?fn=2089.html
Best regards,
Ted Eckert
Compliance Engineer
Microsoft Corporation
ted.eck...@microsoft.com
The opinions expressed are my own and do not necessarily reflect those of my
If anybody's interested, I have a translated copy of
the Feb. 25, 2009 China WEEE regulation. I'd be happy
to email it directly or post to the site of your choosing.
Mike Mertinooke
mertino...@skyskan.com
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion
On 3/25/2009, Don Umbdenstock wrote:
I have perused the IEEE 802.3af explanation on various web sites and
examined
supplier specs. I came to the conclusion that the injector should be LPS
certified and marked as such. However, most of the injectors I have found by
web search do not
Hi Don,
Further to what Joe has stated below, according to IEC 60950-1 an ethernet
interface circuit is generally characterized as an SELV circuit, but must also
be considered a TNV-1 circuit if it is subject to overvoltages (atmospheric
conditions). You might also want to read through CENELEC
I understand that most typical circuits present less than 1k Ohm or upwards of
Meg Ohm load, and that PoE PD circuits are unique in presenting 25k Ohm load.
Am I correct that once the handshake establishes the 25k Ohm load, that the
PSE continuously monitors the load? If for example a short
A primary question in the US is: Does the circuit qualify as a Class 2 (or
Class 3) circuit according to the National Electrical Code? (ref: NFPA 70
clause 725.121) If it fails to qualify, then wiring requirements become quite
stringent.
There are seven possibilities: a listed Class 2 transformer,
I gave a presentation to the Santa Clara Valley chapter of
the PSES in JUN2007 that has guidance on this topic. Find
it at:
http://www.ewh.ieee.org/r6/scv/pses/ieee_scv_pses_jun07.pdf
(My follow-up presentation from FEB2008 is extraordinarily
delinquent in being posted, due to s/w issues at
Hi all
Does anyone have a datasheet or manual for a Schaffner NSG 225 burst module I
could have a copy of?
Best regards
Mr. Kim Boll Jensen
Bolls Rådgivning
Ved Gadekæret 11F
DK-3660 Stenløse
Phone: +45 48 18 35 66
k...@bolls.dk
www.bolls.dk
-
This message is from the
My apologies for thinking out loud – if a PD can present up to a 13 W load,
then the 25k handshake cannot be part of the load, but rather is restricted to
a handshake circuit. So the question is whether there is a spec for current
limiting for PSE? If a PSE is by definition current limited, and
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