I think you have missed the
Then (5)
modulation method is the same over LR and MR, and the same different modulation method is used for VSR, XSR, and USR. (ie all optical module interfaces)
Mike Dudek
QLogic Corporation
Director Signal Integrity
26650 Aliso Viejo Parkway
Aliso Viejo CA 92656
949 389 6269 - office.
Mike.Dudek@xxxxxxxxxx
From: Joel Goergen (jgoergen) [mailto:jgoergen@xxxxxxxxx]
Sent: Wednesday, October 08, 2014 9:32 AM
To: STDS-802-3-400G@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-3-400G] 400Gb/s Electrical Interface Thread - Simulating Coding/Modulation over Discussed Channels
All
We have been working towards guidelines/limit lines of channels appropriate for 50Gb/s electrical interfaces within the 400Gb/s physical system architecture.
There will be discussions on that in the adhoc meeting tomorrow morning.
But that is still a few steps away form working up proposals of modulation methods over an 8 lane by 50Gb/s interconnect.
We have talked about potential reach categories, potential reach budgets, and there has been a number of channels uploaded at
From a modulation stand point, we need to put a proposal together in the coming weeks.
If you or a colleague have time to look at modulation concepts over a range of channels in the next week, and would be willing to share that in 2 weeks towards
a consensus proposal, that would be great!
I would like to start some discussion on this …
It seems to me that we could …
Given C2F (LR), C2C (MR), C2M (VSR), XSR, USR
Then (1) modulation method is the same over LR, MR, VSR, XSR, USR
Then (2) modulation method is the same over LR, MR, VSR and not XSR, USR
Then (3) modulation method is the same over MR, VSR, XSR, USR and not LR
Then (4) modulation method is the same over MR, VSR and not XSR, USR, LR
(1) would be the perfect world but I honestly don't think it will physically work well in applications that make sense to architect.
(2) and (3) seem to be reasonable. There are advantages to (2) with potential receiver compatibility across LR, MR, and VSR.
Take care
Joel Goergen