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Re: [802.3_400GPL] [400GPL] Website updates

John

That is correct.

PSM4 was first introduced in bm, as were other solutions for SMF 100G point-to-point. At the time, our interpretation of Broad Market Potential was that there can only be one solution for SMF. Because there was genuine justification for multiple ones, bm did not adopt any new one. 

This resulted in 100G PSM4 and 100G CWDM4 standardization in MSAs right after the project. 

The bs project recognized need for multiple solutions, which established the paradigm we have today of DRn, FRn, and LRn. Break-out application was recognized as a possible use of DRn, although not explicitly specified. 

Chris


From: John D'Ambrosia <jdambrosia@xxxxxxxxx>
Sent: Wednesday, July 1, 2026 3:24 AM
To: Chris Cole <chris.cole@xxxxxxxxxxxx>
Cc: STDS-802-3-400GPL@xxxxxxxxxxxxxxxxx <STDS-802-3-400GPL@xxxxxxxxxxxxxxxxx>
Subject: Re: [802.3_400GPL] [400GPL] Website updates
 
Chris 
400GBASE-DR4 for PSM4 was defined in 802.3bs- not the 100G project as noted below.

500m was selected at the time due to concerns on closing the budget for 2km.

i’m glad to see the notion of breakout included in the 802.3dj standard.

john



Sent from my iPhone

On Jul 1, 2026, at 1:22 AM, Chris Cole <chris.cole@xxxxxxxxxxxx> wrote:


It's interesting to reflect how on how far DRn has come, from it's introduction as PSM4 in the 100G SMF project, where it was one of many competing point-to-point proposals to today where it's the defacto datacenter optic, although primarily as break-out.


Chris

From: Kent Lusted <00003dd2e253c6a1-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Sunday, June 28, 2026 8:46 AM
To: STDS-802-3-400GPL@xxxxxxxxxxxxxxxxx <STDS-802-3-400GPL@xxxxxxxxxxxxxxxxx>
Subject: [EXTERNAL]: [802.3_400GPL] [400GPL] Website updates
 
Dear Colleagues,
 
A majority of the contributions for the upcoming 30 June 2026 electronic teleconference interim meeting were posted.  See: https://www.ieee802.org/3/400GPL/public/260630/index.html [ieee802.org]
 
With regards,
-Kent
 
 
 
 
Kent Lusted
Chair, IEEE 802.3 400Gbps/lane Signaling Study Group
 
 
 
 

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