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Re: [802.3_4PPOE] Backfeed presentation + baseline

Hi Heath,

v220 and v230 correspond to both approaches we discussed during the adhoc call.
At the end of the call, I believe the consensus was to split Irev into two values (for >21V and <21V), which corresponds with v230.

Overview:
v220
- PSE requirement Irev is 1.3mA and applies when applying 2-pair (=3-pair) power on the unpowered negative
- PD has to safeguard classification, hence has a 3P-backfeed requirement from 0-21V

v230
- PSE requirement is split into 500uA when highest pairset voltage <21V and 1.3mA when highest pairset voltage >21V
- Because the PSE has a current limit that does not corrupt classifcation in the classification range, the PD is only required to limit 3P-backfeed in the detection range 0-10.1V

The advantage of v230 is that it allows for wider implementation of PD bridges.

Kind regards,

Lennart

On Thu, 2018-05-10 at 16:05 +0000, Stewart, Heath wrote:

Lennart,

 

Version 220 showed 21V. This version shows 10.1V. Can you comment?

 

Heath Stewart
Design Center Manager

PoE/PoDL Products

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Inline image 2

 

From: Lennart Yseboodt [mailto:lennart.yseboodt@xxxxxxxxxxx]
Sent: Wednesday, May 9, 2018 12:49 PM
To: STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_4PPOE] Backfeed presentation + baseline

 

Updated as discussed during the meeting, this is version 230.

 

On Mon, 2018-05-07 at 20:40 +0000, Lennart Yseboodt wrote:

Hi all,

 

As presented today. I’m currently updating the text based on the feedback I got.

 

Kind regards,

 

Lennart

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