Re: [802.3_4PPOE] Backfeed issue - Analysis of the issue and proposals for a solution

[Yair Darshan <YDarshan@xxxxxxxxxxxxx>]

Hi Chad,

Yes, Chad, we spent an hour on this too, and we saw per your data, that you shipped millions of APs with ideal diode bridges BUT THOSE DIODE BRIDGES per your measurements didn’t have the backfeed issue in 3-pair so it proves my inputs that our 4-pair PSE systems never detected a legacy PD with backfeed issue over 3-pair.

So, so far, we don’t have data that they are exists. Please note that there is a bullet in page 7 that also ask for data on these PDs.

Once we have this data (about PDs with Hybrid bridges that have the backfeed issue in 3-pair), I will be happy to include it in my presentation.

 

I am trying to keep my presentation 100% accurate based on facts since the risk of doing mistakes based on conclusions from wrong data is huge.

 

Regarding the length of the presentation:

Most of the slides moved to the Annex. We will not have to review it again unless somebody will ask for specific answer.

The rest are similar slides that we can skip but needed for continuity + updated of the presentation based on the discussions so far + proposal for solutions.

 

Yair

 

From: Chad Jones (cmjones) [mailto:cmjones@xxxxxxxxx]
Sent: Tuesday, April 24, 2018 4:47 AM
To: Yair Darshan <YDarshan@xxxxxxxxxxxxx>; STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Cc: Stewart, Heath <Heath.Stewart@xxxxxxxxxx>; 'Yseboodt, Lennart' <lennart.yseboodt@xxxxxxxxxxx>; Dylan Walker (dylanwal) <dylanwal@xxxxxxxxx>; Chris Bullock (bullock) <bullock@xxxxxxxxx>; Abramson, David <david.abramson@xxxxxx>; Picard, Jean <jean_picard@xxxxxx>; Stover, David <David.Stover@xxxxxxxxxx>; Wendt, Matthias <matthias.wendt@xxxxxxxxxxx>; Geoff Thompson <thompson@xxxxxxxx>; George Zimmerman (george@xxxxxxxxxxxxxxxxxxxx) <george@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: Backfeed issue - Analysis of the issue and proposals for a solution

 

EXTERNAL EMAIL

Yair, page 7. You state in red that these devices don’t exist. I spent an hour with you on the phone today telling you that they do exist. I don’t know part numbers (at least not yet, still working on that) but I have been told by people that I trust that Type 1 and Type 2 PDs that use the minimal hybrid bridge is already deployed in the field.

 

This deck is still 12 pages long, not including the annexes. I will not rehash the same stuff we covered last week. Be ready to very quickly get to the meat of this slide deck.

 

Chad Jones

Tech Lead, Cisco Systems

Chair, IEEE P802.3bt 4PPoE Task Force

Principal, NFPA 70 CMP3

From: Yair Darshan <YDarshan@xxxxxxxxxxxxx>
Date: Monday, April 23, 2018 at 7:08 PM
To: 4PPOE Reflector <STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx>
Cc: Yair Darshan <YDarshan@xxxxxxxxxxxxx>, "Stewart, Heath" <Heath.Stewart@xxxxxxxxxx>, "'Yseboodt, Lennart'" <lennart.yseboodt@xxxxxxxxxxx>, "Dylan Walker (dylanwal)" <dylanwal@xxxxxxxxx>, "Chris Bullock (bullock)" <bullock@xxxxxxxxx>, Chad Jones <cmjones@xxxxxxxxx>, "Abramson, David" <david.abramson@xxxxxx>, "Picard, Jean" <jean_picard@xxxxxx>, "Stover, David" <David.Stover@xxxxxxxxxx>, "Wendt, Matthias" <matthias.wendt@xxxxxxxxxxx>, Geoff Thompson <thompson@xxxxxxxx>, "George Zimmerman (george@xxxxxxxxxxxxxxxxxxxx)" <george@xxxxxxxxxxxxxxxxxxxx>
Subject: Backfeed issue - Analysis of the issue and proposals for a solution

 

Hi all,

Please find updated presentation regarding the issue, analysis results of some use cases and proposal for solution.

Regards

Yair

 

Darshan Yair

Chief R&D Engineer

Analog Mixed Signal Group

Microsemi Corporation

 

1 Hanagar St., P.O. Box 7220
Neve Ne'eman Industrial Zone
Hod Hasharon 45421, Israel
Tel:  +972-9-775-5100, EXT 210.

Cell: +972-54-4893019
Fax: +972-9-775-5111

 

E-mail: <mailto:ydarshan@xxxxxxxxxxxxx>.  

 

 

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