Re: [802.3_B10GAUTO] AC coupling capacitors information

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To: STDS-802-3-B10GAUTO@xxxxxxxxxxxxxxxxx

Subject: Re: [802.3_B10GAUTO] AC coupling capacitors information

From: George Zimmerman <george@xxxxxxxxxxxxxxxxxxxx>

Date: Thu, 13 Jan 2022 00:05:58 +0000

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Reply-to: George Zimmerman <george@xxxxxxxxxxxxxxxxxxxx>

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Thread-topic: [802.3_B10GAUTO] AC coupling capacitors information

Guys, looking at this, I’m coming to the opinion that we have to specify the link segment (equation 165-25) at frequencies lower than 10 MHz. Not only do the implementation considerations that German has raised apply, but consider the autoneg signal. Clause 98 autoneg is a 16.7 Mbit DME stream. Cutting out the lower 10 MHz will kill autoneg.

So, where that leaves us is to write text that keeps the cabling guys from having to set their testers to start at 1 MHz. Nobody wants that. Anyone who has done wideband measurements knows that there are several ways around this, generally measuring in more than one pass (one for the low frequencies and one for the rest) but from a standards perspective they all involve just writing a good informative note.

-george

From: German Feyh <gerfeyh@xxxxxxxxx>
Sent: Wednesday, January 12, 2022 3:50 PM
To: STDS-802-3-B10GAUTO@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_B10GAUTO] AC coupling capacitors information

Hi Haysam,

George Zimmerman suggested using 1MHz as the lower frequency limit to be consistent with 802.3ch.

vakilian_3ch_01_0719.pdf in 802.3ch had PHY termination circuit values and board component assumptions for PoDL on slide 4.

Thank you,

German Feyh

On Tue, Jan 11, 2022 at 7:50 PM Haysam Kadry <hkadry@xxxxxxxx> wrote:

Hello,

The discussion in moving the IL limit from 10MHz to 2MHz in accordance to https://www.ieee802.org/3/cy/public/nov21/feyh_3cy_01b_01_11_09_21.pdf. I am looking for some information

1. AC couple capacitor value range and ESR characteristics.

2. PHY termination circuit values

This will help put together a simulation profile for the front end circuit.

Best regards,

Haysam M. Kadry

Ford Motor Company

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