|
Introduction 100G/lane optics with compliant TDECQ have interoperability issues in deployment
www.ieee802.org
|
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) <00000b59be7040a9-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Monday, July 28, 2025 8:14 AM
To: STDS-802-3-B400G@xxxxxxxxxxxxxxxxx <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://www.ieee802.org/3/calendar.html
[ieee802.org]
Mark
From: Mark Nowell (mnowell) <00000b59be7040a9-dmarc-request@xxxxxxxxxxxxxxxxx>
Date: Monday, July 28, 2025 at 5:06 PM
To: STDS-802-3-B400G@xxxxxxxxxxxxxxxxx <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
To unsubscribe from the STDS-802-3-B400G list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-B400G&A=1
|