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Re: [802.3_B400G] [802.3dj] Tuesday AM0 (8-9am) will be used for optical/common topics.

Hi Chris,

Since this is not an IEEE P802.3dj activity, I want to ask that you and anybody else participating review the email from Paul Nikolich about the 'IEEE SA position on unofficial 802 related activities' <https://grouper.ieee.org/groups//802/secmail/msg07392.html>. While Pual sent the email in 2005, it remains relevant today. 

Best regards,
  David

-----

From: Chris Cole <chris.cole@xxxxxxxxxxxx> 
Sent: 29 July 2025 08:43
To: STDS-802-3-B400G@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_B400G] [802.3dj] Tuesday AM0 (8-9am) will be used for optical/common topics.

Yesterday, many of the questions after the presentation of the https://urldefense.com/v3/__https://www.ieee802.org/3/dj/public/25_07/cole_3dj_01b_2507.pdf__;!!NpxR!hJ1YmGgK08nTzLn5V8YkHNICDibKgV-UErVTBVKKyzRQy-CNYdQv1w_b5MH8EeWeYCFxOKKs4wC0X9E$ were not fully answered because of time limitations.  
https://urldefense.com/v3/__https://www.ieee802.org/3/dj/public/25_07/cole_3dj_01b_2507.pdf__;!!NpxR!hJ1YmGgK08nTzLn5V8YkHNICDibKgV-UErVTBVKKyzRQy-CNYdQv1w_b5MH8EeWeYCFxOKKs4wC0X9E$
Introduction 100G/lane optics with compliant TDECQ have interoperability issues in deployment
https://urldefense.com/v3/__http://www.ieee802.org__;!!NpxR!hJ1YmGgK08nTzLn5V8YkHNICDibKgV-UErVTBVKKyzRQy-CNYdQv1w_b5MH8EeWeYCFxOKKsOIGA_Xw$
To help with understanding, I put together a spread-sheet case-study to better explain the test, see below. It shows that the test:
• removes FRx sensitivity and Equalization dependance (DSP variation)
• removes TECQ and TDECQ dependance
• gives credit for excess Tx power above min required
• does not screen for excess TECQ and TDECQ (the test is not stand alone)
• there are other ways to specify equivalent FRX Test OMA.

Today, at lunch, I will hold an informal tutorial explaining the proposal, with the help of the case study. We can run additional scenarios to help in the understanding. We will meet at the entrance to the lunch area at 11:50AM and find a table. You can also reach out directly to me or others on the Author Team with questions. 

Thank you

Chris

DRn Case
0
1
2
3
4
5
6
Tx DUT
characteristics
Tx OMA (min) margin
0.0
0
1
-1
0
1
0

TECQ
1.5
1.5
1.5
1.5
1.5
3.5
1.5

Dispersion (D)
1.0
1
1
1
-1
1.5
3.5
FRx
characteristics
Equalizer
Std
Std
Std
Extra
Extra
Std
Std
Extra
Extra
Std
Std
Extra
Extra
Std
Std
Extra
Extra
Std
Std
Extra
Extra
Std
Std
Extra
Extra

RxS
Min
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Min
Extra
Tx
Tx Spec OMA (min)
1.3
1.3
1.3
1.3
0.3
3.8
3.8

Tx Spec equation @ TECQ =0
-1.2
-1.2
-1.2
-1.2
-1.2
-1.2
-1.2

Tx DUT TECQ
1.5
1.5
1.5
1.5
1.5
3.5
1.5

Tx DUT TDECQ
2.5
2.5
2.5
2.5
0.5
5.0
5.0

Tx DUT OMA
1.3
1.3
2.3
0.3
0.3
4.8
3.8
Channel
Channel Insertion Loss
3.0
3.0
3.0
3.0
3.0
3.0
3.0

MPI DGD Penalty Allocation
0.1
0.1
0.1
0.1
0.1
0.1
0.1
Rx
RxS Spec (max)
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-2.8
-0.8
-0.8
-0.8
-0.8
-2.8
-2.8
-2.8
-2.8

RxS Spec equation @ TECQ =0
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3
-4.3

FRx RxS @ TECQ = 0
-4.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3
-4.3
-5.3

FRx RxS vs. TECQ slope
1.0
1.0
1.0
0.5
0.5
1.0
1.0
0.5
0.5
1.0
1.0
0.5
0.5
1.0
1.0
0.5
0.5
1.0
1.0
0.5
0.5
1.0
1.0
0.5
0.5

FRx RxS @ Tx DUT TECQ
-2.8
-2.8
-3.8
-3.6
-4.6
-2.8
-3.8
-3.6
-4.6
-2.8
-3.8
-3.6
-4.6
-2.8
-3.8
-3.6
-4.6
-0.8
-1.8
-2.6
-3.6
-2.8
-3.8
-3.6
-4.6
FRx FEC
Test margin
0.0
1.5
1.5
1.5
1.5
1.5
1.5
FRx OMA
FRx Test OMA (min)
-2.8
-1.3
-2.3
-2.1
-3.1
-1.3
-2.3
-2.1
-3.1
-1.3
-2.3
-2.1
-3.1
-1.3
-2.3
-2.1
-3.1
0.7
-0.3
-1.1
-2.1
-1.3
-2.3
-2.1
-3.1

FRX Test OMA
-2.8
-1.3
-2.3
-2.1
-3.1
-0.3
-1.3
-1.1
-2.1
-2.3
-3.3
-3.1
-4.1
-1.3
-2.3
-2.1
-3.1
1.7
0.7
-0.1
-1.1
-1.3
-2.3
-2.1
-3.1
Test pass/fail criteria correct
Yes
Yes
Yes
Yes
Yes
No 
No 


________________________________________
From: Mark Nowell (mnowell) <mailto:00000b59be7040a9-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Monday, July 28, 2025 8:14 AM
To: mailto:STDS-802-3-B400G@xxxxxxxxxxxxxxxxx <mailto:STDS-802-3-B400G@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_B400G] [802.3dj] Tuesday AM0 (8-9am) will be used for optical/common topics.
 
For those not on the optical track reflector where the invite is sent, you can get the log in information here: https://urldefense.com/v3/__https://www.ieee802.org/3/calendar.html__;!!BEJPKrpf!6aeWA7VyssXf5TB__GO3DWmPq1j9SE_bh8HQv2zmd8ZuyDcCm7W_zqeLQwP8Y7kdZF7NOBjOGNU_6VYKs6kk3If_r0h4D6k7A0A$
 
Mark
 
From: Mark Nowell (mnowell) <mailto:00000b59be7040a9-dmarc-request@xxxxxxxxxxxxxxxxx>
Date: Monday, July 28, 2025 at 5:06 PM
To: mailto:STDS-802-3-B400G@xxxxxxxxxxxxxxxxx <mailto:STDS-802-3-B400G@xxxxxxxxxxxxxxxxx>
Subject: [802.3_B400G] [802.3dj] Tuesday AM0 (8-9am) will be used for optical/common topics.
Based on the slower than anticipated progress so far today, we’ve decided that we will need to utilize the AM0 session (8-9am) on Tuesday morning to cover some of the optical related comments (related to TDECQ) that we consider having common interest. 
 
Only the optical track will be meeting in AM0 session.
 
We will meet in the optical track room (same one as we’re in today).  At the start of AM1, the optical track will continue and folks participating in the electrical and logic tracks will be able to move across to their rooms.
 
Regards,
Mark
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