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Re: [802.3_4PPOE] Comments related to #204 that I asked to pull out, are not in the TFTD file

I thought we buried this when I sent you the email last week. Let me dig it out to remind you:


Yair, yet another beautiful side benefit of splitting 4P from Clause 33 – everything you had in Clause 33 will still be there. Link section served us fine there AND allowed your desired application. When we get to 4P PSEs, this problem goes away. There is zero reason to have a 4P endspan and midspan on the same link SEGMENT as only the midspan link SECTION will be valid (with the midspan required to DC block the endspan from the PD).


The only hole is now the 2P modes of Type 3 PSEs. I am fine to leave this caveat in 33 and not carry it forward to 145 (in fact, I’d prefer it cause I view it as a bastardization of the standard that was SOLELY implemented to violate the clear intent of AT to deliver 25.5 and only 25.5W to a PD). Mind you, this doesn’t stop you from doing exactly what you did with Clause 33 devices with Clause 145 devices. But there is no reason to overly complicate Clause 145 for this.


Also, piling on with George’s comment. You can’t put active or powered into the definition of link section. What is it when it’s not powered? What do we probe to detect, CC and class?


Let me reiterate: THERE IS ZERO REASON TO HAVE A 4P ENDSPAN AND MIDSPAN ON THE SAME LINK SEGMENT. I will recuse myself as chair during this discussion and fight this text. It does not belong in 145.


Chad Jones

Tech Lead, Cisco Systems

Chair, IEEE P802.3bt 4PPoE Task Force


From: Yair Darshan <YDarshan@xxxxxxxxxxxxx>
Date: Friday, May 19, 2017 at 7:23 PM
To: "Abramson, David" <david.abramson@xxxxxx>
Cc: Chad Jones <cmjones@xxxxxxxxx>, Yair Darshan <YDarshan@xxxxxxxxxxxxx>, 4PPOE Reflector <STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx>
Subject: Comments related to #204 that I asked to pull out, are not in the TFTD file


Hi David,


Regarding TFTD file:

  1. I made errors with my response to comment 204:

Error 1: My presentation that addresses the comment is darshan_14_0517.pdf and not darshan_13_0517.pdf

Error 2: In my first response after TFDT FS which says:

“Keep it TFTD. It can’t be REF204. It is bigger text change. I propose different text: Change to " Within Clause 145 and its annexes, the term link section refers to the point-to-point medium connection between two and only two active Power Interfaces (PIs)."

a)       It belongs to comment #205 and not #204. Therefore comment #205 need to be in the TFTD file.

b)       The response text need to be change to only: Keep it TFTD. It cant be REF204. It is bigger text change. In addition, what is active?  it needs to be clearly defined and make sure that Endspan and Midspan are still allowed to be connected to the same PD as was allowed always in PoE and is covered by this spec.


  1. Comment #194 should not be referenced to comment REF 204 since it involves other issue. My response to this comment:  “Does link section contains 4 connector channel behavior as we used to assume in our P2P Runb analysis?”








Darshan Yair

Chief R&D Engineer

Analog Mixed Signal Group

Microsemi Corporation


1 Hanagar St., P.O. Box 7220
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E-mail: <mailto:ydarshan@xxxxxxxxxxxxx>.