Re: [802.3_4PPOE] Yair's presentations for January 2017 IEEE802.3bt meeting

[David Stover <00000687aebafbf1-dmarc-request@xxxxxxxx>]

Sending this again; repeater denied due to a couple confidentiality agreements.

Hey Yair,

Thanks for generating all this content. I'd like to address darshan_01.

On the whole, there's a lot of good work here in promoting important parts of the spec into Clause 33 and maintaining supporting text in informative annex 33b.

I would like to help improve the 2 "shall" statements you've created in Clause 33:

"Conformance with Equation (33–15) shall be met for RPSE_max and RPSE_min."

 I'm not sure what this "shall" is meant to do. My understanding of the PSE unbalance requirements is, given a defined "worst-case" fixture (composed of Rload_min, Rload_max, and P_Class_PD measured at "PD PI"), the PSE shall not exceed ICon-2p-unb,min on any pairset as defined by your 33.2.8.1.1. This "worst-case" fixture you have created is testable at PSE PI and based on good data. In that case, I believe it is redundant to enforce an internal PSE parameter and I propose you strike this "shall". That way, we can maintain all the informative design guidelines for R_pse as specified in Annex 33B, but the conformance guidelines are based on 33.2.8.5.1.1. This allows for best PSE design flexibility.

"RPSE_max, RPSE_min and ICon-2P-unb shall be measured determined according to with the tests model specified in 33.2.8.5.1.1. "

I believe your intent for this statement is in the right place. I believe you're trying to say "PSEs which meet the requirements of 33.2.8.5.1.1 conform with all PSE unbalance requirements." However, what you've really said here is "PSE test houses shall use this test method to measure (not confirm, just measure) PSE unbalance parameters". First, we can't specify test methods. Second, this shall does not prove conformance, it only specifies measurement. I propose you replace this shall with "Current unbalance requirements (ICon−2P−unb) of a PSE shall be met with Rload_max and Rload_min as specified by 33.2.8.5.1.1."

I think my 2 proposed changes are in line with your intent for this text. I would love to speak more with you about this at the meeting. When you have a moment, please feel free to find me and discuss.

Thanks!

Cheers,

David Stover II

On Wed, Jan 11, 2017 at 4:18 AM, Yair Darshan <YDarshan@xxxxxxxxxxxxx> wrote:

Hi Heath,

Many Thanks.

I will update it.

Yair

 

From: Heath Stewart [mailto:hstewart@xxxxxxxxxx]
Sent: Monday, January 09, 2017 7:53 PM
To: Yair Darshan
Cc: Yseboodt, Lennart; David Stover (dstover@xxxxxxxxxx); Abramson, David; bullock Cisco; Christian BEIA; dylanwal Cisco; Fred Schindler; Miklos.Lukacs@xxxxxxxxxx; Picard, Jean; Sesha Panguluri; Shahar Feldman; Wendt, Matthias; STDS-802-3-4PPOE@LISTSERV.IEEE.ORG

Subject: Re: Yair's presentations for January 2017 IEEE802.3bt meeting

 

EXTERNAL EMAIL

Please see further notes on 02. In agreement with Lennart plus added variable description.

 

Thanks

 

-Heath

 

On Mon, Jan 9, 2017 at 7:07 AM, Yair Darshan <YDarshan@xxxxxxxxxxxxx> wrote:

Hi Lennart and all,

Please find attached updated files per last comments from Lennart for darshan_01_0117.pdf and darshan_05_0517.pdf.

Regards

Yair

 

From: Yseboodt, Lennart [mailto:lennart.yseboodt@philips.com]
Sent: Saturday, January 07, 2017 3:52 PM
To: Yair Darshan; David Stover (dstover@xxxxxxxxxx); Heath Stewart (hstewart@xxxxxxxxxx); Abramson, David; bullock Cisco; Christian BEIA; dylanwal Cisco; Fred Schindler; Miklos.Lukacs@xxxxxxxxxx; Picard, Jean; Sesha Panguluri; Shahar Feldman; Wendt, Matthias
Subject: Re: Yair's presentations for January 2017 IEEE802.3bt meeting

 

EXTERNAL EMAIL

Hi Yair,

 

Again a lot of work

 

Attached comments.

 

Kind regards,

 

Lennart

 

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From: Yair Darshan <YDarshan@xxxxxxxxxxxxx>
Sent: Saturday, January 7, 2017 1:40
To: David Stover (dstover@xxxxxxxxxx); Heath Stewart (hstewart@xxxxxxxxxx); Abramson, David; bullock Cisco; Christian BEIA; dylanwal Cisco; Fred Schindler; Miklos.Lukacs@xxxxxxxxxx; Picard, Jean; Sesha Panguluri; Shahar Feldman; Wendt, Matthias; Yseboodt, Lennart
Subject: Yair's presentations for January 2017 IEEE802.3bt meeting

 

Hi all,

Please find my presentations attached.

Any comment will be appreciated.

Thanks

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>.  

 

 

 

 

--

Heath Stewart
Design Center Manager