[802.3_SPMD] Clarification and intent regarding cable sectioning in pres

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[802.3_SPMD] Clarification and intent regarding cable sectioning in presentation

To: STDS-802-3-SPMD@xxxxxxxxxxxxxxxxx

Subject: [802.3_SPMD] Clarification and intent regarding cable sectioning in presentation

From: "Christopher T. Diminico" <00000025925d7602-dmarc-request@xxxxxxxxxxxxxxxxx>

Date: Thu, 5 May 2022 19:36:31 +0000

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Reply-to: "Christopher T. Diminico" <cdimi80749@xxxxxxx>

Colleagues,

I received a number of questions of clarification and intent regarding presentation [https://www.ieee802.org/3/da/public/050422/diminico_SPMD_01_05042022.pdf 5/42022] summarized below.

>The cable sectioning impedance in the presentation is the asymptotic impedance; the cable model used in the analysis is frequency dependent; see https://www.ieee802.org/3/da/public/0721/diminico_SPMD_01_0721.pdf.

>The cable sectioning impedance is for information in the development of the return loss specifications.

>>>802.3cg return loss specifications supports cable sectioning impedance mismatches of 100 ohms ~(+/- 8 ohms).

>>>802.3da return loss supports cable sectioning impedance mismatches of TBD ohms +/- TBD ohms (may have to tighten to +/- 4 ohms based on TX/RX model addition); will complete this in subsequent presentation.

Regards, Chris

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