Max – thanks for this update – your slides 9 through 11 point at the issues here that I am trying to wrap my head around – the relationship between the gate-open time and the ethernet frame size. It seems
that you have to have an extra frame buffer either above the xMII or within the PHY to accommodate mismatch of an offered Ethernet frame to the PHY timing unless the frames are somehow synchronized to the gate time – and synchronizing to the gate time within
the PHY would break layering… (I was thinking about this in regards to Kirsten & Kamal’s presentation on latency – dealing with that mismatch is an inherent additional buffer in a TDD system, I haven’t seen a way around it. You may argue it isn’t large,
but I’m not seeing a way around the synchronization and the buffer needs to be accounted…)
As you say, the PHY doesn’t usually know about frames – I would say, the PHY isn’t supposed to know about frames.
Using something like preemption (e.g., clause 99 - which is defined when you have 2 MAC queues competing for the medium…) is an interesting notion for fragmenting a frame, but I would see this as just allowing
a smaller maximum frame size. Is there something else here you are trying to communicate?
George Zimmerman, Ph.D.
President & Principal
CME Consulting, Inc.
Experts in Advanced PHYsical Communications
george@xxxxxxxxxxxxxxxxxxxx
310-920-3860
From: Max Turner <max.turner@xxxxxxxx>
Sent: Thursday, July 11, 2024 8:01 AM
To: STDS-802-3-ISAAC@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_ISAAC] Presentation for the July Plenary
Thanks to everybody who took the time to look over my initial presentation draft and gave feedback. I took your input and questions to hopefully improve the presentation in terms of clarity and ease of understanding.
Here is an update to be presented next week.
--
Max Turner, Dipl.Phys.
Automotive
Network Architect
Ethernovia BV
Utrechtseweg 75
3702AA Zeist
The Netherlands
https://www.ethernovia.com/
c-de: +49 177 863 7804
c-nl: +31 685 386 449
Please find attached my slides for the .3dm session during the July Plenary.
Feedback and questions up front are very welcome!
--
Max Turner, Dipl.Phys.
Automotive
Network Architect
Ethernovia BV
Utrechtseweg 75
3702AA Zeist
The Netherlands
https://www.ethernovia.com/
c-de: +49 177 863 7804
c-nl: +31 685 386 449
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