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Here is what I am going to put in the maintenance request and then when it get kicked to us, we can talk it out more in the room. The summary email I sent can be used as reference to the 3 different branch topics.
Reference - http://www.ieee802.org/3/bt/public/jan15/balasubramanian_02_0115.pdf
- PDs in the field turn on their Load during Inrush. This leads to PD cap not charging up fully (even if C<180uf and PSE is following inrush rules from 220.127.116.11). This may lead to operational problems after inrush. There is a Voff requirement in PD table 33-18 to ensure power supply remains turned off for V<30V, but customers seem to read this as applicable only "after power on" not during "power on" - hence they turn on their DC-DC during inrush causing problems.
Add the following to section 18.104.22.168
"PDs shall not draw more than the maximum current allowed by a PSE during inrush as outlined in section 22.214.171.124"
Change 2nd paragraph of section 126.96.36.199 as follows (change shown with underline)
"The PD shall not turn on until a voltage greater than Voff and less than or equal to Von"
From: George Zimmerman <george@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Reply-To: George Zimmerman <george@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Thursday, March 19, 2015 10:14 AM
To: "STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx" <STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_4PPOE] PD Load turn on
Yes, I agree, and you even pointed out the clarification on “turn on/off”, as “- turn PoE draw off – perhaps just having it say, ‘the PD shall turn PoE draw on’ instead of the ‘PD shall turn on’ might be clearer.
Anyhow, just to be clear, which version of the proposal were you going to suggest? The original with ‘should’? (which didn’t have half of the issues we discussed) or something else?
Principal, CME Consulting
Experts in Advanced PHYsical Communications Technology
(PLEASE NOTE NEW EMAIL ADDRESS. THE OTHER WILL STILL WORK, BUT PLEASE USE THIS FOR CME BUSINESS)
On 3/17/15 5:47 PM, Koussalya Balasubramanian (kobalasu) wrote: