[802.3_ISAAC] Comment on buffering difference between 802.3ch and TDD

[Yunteng Huang <yunteng@xxxxxxxxxxxx>]

Dear Kirsten, Kamal,

Thank you for your contribution on buffering analysis:

https://www.ieee802.org/3/dm/public/0724/matheus_dalmia_dm_03_buffering_07152024.pdf 

 

In slide 12 of the presentation, you write that an FDX/EEE (802.3ch) would need “Normal MAC buffers (esp. pause), wake time buffers for min 9us @ high rate” on the camera side. 

 

An implied assumption here is that 802.3ch based camera system would go in and out of LPI for power savings in the downstream direction analogous to TDD scheme.  In practice, frequent entering/exiting LPI is not needed in the downstream direction thanks to FDX.  If you leave the downstream direction active and only enter/exit LPI in the upstream direction, which is a rational use of EEE for this application, there would be no need for wake time buffers at high rate on the camera side. 

 

Sincerely,

Yunteng Huang

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