[802.3_B400G_ELEC] [802.3dj] COM Parameter Value Consensus Building – AUI C2M & C2C, Part 2

["Lusted, Kent C" <kent.c.lusted@xxxxxxxxx>]

Dear Colleagues,

 

Further consensus building occurred on the AUI C2M and C2C COM parameter values after the May 2024 interim meeting.  A consensus proposal is now posted at https://www.ieee802.org/3/dj/public/24_06/lusted_3dj_01a_2406.pdf

 

The recommendation is:

• For 200G/lane AUI C2M and AUI C2C, set the COM parameter values as follows:

• # RXFFE taps

• Number of fixed-position taps (N_fix) = 14 (d_w + 1 + 8 fixed-position post-cursor taps)
• Number of floating tap groups (N_g) = 2
• Number of taps per floating tap group (N_f) = 4
• Highest allowed tap index  (N_max) = 50

• A_v = A_fe = 0.413
• A_ne = 0.45

• Set COM = 3dB for analysis

 

 

Note: In 178A.1.8.1, “The total number of taps in the feed-forward filter, N_w, is N_fix + N_g*N_f” (P656 L11) and this seems to include the precursor taps d_w (e.g., based on Figure 178A–8).

 

With regards,

-Kent

 

 

 

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