Re: [802.3_SPMD] 802.3da Isolation Proposal Post-Meeting Edits

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To: STDS-802-3-SPMD@xxxxxxxxxxxxxxxxx

Subject: Re: [802.3_SPMD] 802.3da Isolation Proposal Post-Meeting Edits

From: "Jason Potterf (jpotterf)" <0000142267c8912c-dmarc-request@xxxxxxxxxxxxxxxxx>

Date: Thu, 13 Mar 2025 16:13:34 +0000

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Reply-to: "Jason Potterf (jpotterf)" <jpotterf@xxxxxxxxx>

Thread-index: AQHbk8u4KPohqT7UukybrtcGK3+LALNxPdzg

Thread-topic: 802.3da Isolation Proposal Post-Meeting Edits

I received very helpful feedback from a few folks this morning and have incorporated the suggested changes into this v03 revision.

Jason Potterf

From: Jason Potterf (jpotterf) <0000142267c8912c-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, March 12, 2025 11:06 PM
To: STDS-802-3-SPMD@xxxxxxxxxxxxxxxxx <STDS-802-3-SPMD@xxxxxxxxxxxxxxxxx>
Subject: [802.3_SPMD] 802.3da Isolation Proposal Post-Meeting Edits

Esteemed Isolation Enthusiasts,

I have implemented the feedback received during my presentation today in the attached documents. The key differences from what was presented today include:

Improving 188.10.1 General Safety instead of copying it from Clause 147, as well as preparing suggested revised text for a future Clause 147 maintenance request.
Moved the expository text into Annex J, which I ultimately edited to pave the way for other clauses to rely on it more extensively in the future.
Incorporated enhanced figures into Annex J to depict MPSE and MPD grounding architectures.
Improved upon the Clause 189 isolation requirement language, taking it beyond a simple copy of the PoE and PoDL requirements, resolving redundancies and ambiguities.
I took the potentially controversial stance that accessibility of conductors is the wrong criteria for PoE/PoDL/MPoE isolation requirements and broke with the other Clauses for MPoE in defining a new criteria.
I walked back my proposal that we should be able to ground MPDs and instead aligned with PoDL which only permits grounding MPSEs.

I am open to discussion on permitting MPD grounding, but would need to be sure we aren't causing problems as we haven't allowed this before.

I appreciate your attention today and welcome any and all feedback on this proposal ahead of our Thursday, March 20^th 802.3da off-cycle Interim.

Jason Potterf

Principal Hardware Engineer, Cisco

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