[802.3_ISAAC] More information on “Complexity of ACT/GMSLE Implementatio

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[802.3_ISAAC] More information on “Complexity of ACT/GMSLE Implementations”

To: STDS-802-3-ISAAC@xxxxxxxxxxxxxxxxx

Subject: [802.3_ISAAC] More information on “Complexity of ACT/GMSLE Implementations”

From: Ragnar Jonsson <rjonsson@xxxxxxxxxxx>

Date: Thu, 26 Jun 2025 23:34:04 +0000

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Reply-to: Ragnar Jonsson <rjonsson@xxxxxxxxxxx>

Thread-index: Advm8kRsLsGd9j6hRkuMojXMclk/0w==

Thread-topic: More information on “Complexity of ACT/GMSLE Implementations”

All,

In today’s 802.3dm ad hoc meeting I gave presentation titled “Complexity of ACT/GMSLE Implementations” (see https://www.ieee802.org/3/dm/public/adhoc/062625/jonsson_3dm_02_06_26_25.pdf).

In discussions of the presentation, I was asked to provide more information about the channel I used in my simulations, and about the DFE coefficients.

The channels that I used are taken from the simulated coax cables that I shared in the March meeting in Atlanta: https://www.ieee802.org/3/dm/public/0325/jonsson_3dm_01_03_10_25.pdf

More specifically I used the 5^th and 7^th cables shown on slide 14 of that presentation. Note that the 7^th cable has particularly bad echo characteristics because it has the “ugly” connector with excessive impedance mismatch, and it has 6 Ohm cable impedance mismatch at each connector.

The S-parameters and impulse responses for these cables can be downloaded from links in the Atlanta 802.3dm home page: https://www.ieee802.org/3/dm/public/0325/index.html

The enclosed plots show the Decision Feedback Equalizer coefficients for the four different simulation runs shown in my presentation today.

Please let me know if you have any additional questions.

Ragnar

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