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Re: [802.3_SPEP2P] Question about the 8B6T LC in your presentation taday

Hi Brian,

 

Thank you for the response and bring to the list…

Noticed that the disparity of 8B6T code pair in 100BASE-T4 is ±1 and your proposal is ±3, any reason for that?

And also, with code group, it may provide SNR margin against AWGN, but there still have concern on the EFT (even under 1kv, the signal is still impact, not even for the 2kv worst case in 61000-4-4).

 

Thank you very much~

 

Best Regards,

 

Yan

 

From: Murray, Brian <Brian.Murray@xxxxxxxxxx>
Sent: Tuesday, March 12, 2024 7:44 AM
To: STDS-802-3-SPEP2P@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_SPEP2P] Question about the 8B6T LC in your presentation taday

 

Yan

 

8B6T line coding was used in 100BASE-T4, 802.3u-1995.

 

23. Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA)

sublayer and baseband medium, type 100BASE-T4

 

So this coding scheme has been around for a long time.

 

I don’t know what RS coding scheme might be used or if we need to use RS coding. That requires some more study.

 

Brian

 

 

From: Zhuangyan (Yan) <zhuangyan.zhuang@xxxxxxxxxx>
Sent: Monday, March 11, 2024 11:55 PM
To: Murray, Brian <Brian.Murray@xxxxxxxxxx>
Subject: Question about the 8B6T LC in your presentation taday

Hi Brian,

 

Thanks for your presentation today. But still confused with how 8B6T LC works... May I ask any reference in IEEE 802.3 that previously introduce this code groups? Can you elaborate a bit on this?

 

Also, with this coding scheme, which RS FEC do you think we can choose for the 500m reach?

 

Thank you very much~

 

Best Regards,

 

Yan

 

 

Brian

 

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