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[802.3_B400G_OPTX] 802.3dj Transmitter Functional Test



Dear 802.3dj Task Force Optical Track Participants, 

The Transmitter Functional Test (TFT) was first proposed at the July '25 meeting, with updates at every meeting since then. Other than adding test fiber to the proposal at the Sept. '25 meeting, all the changes and additions are to make TFT more understandable. May '26 presentation appendices 1 and 2 are continued refinements. Yet even last week, we were addressing questions. 

Because TFT presentations and specifications are not stand alone, the Optical Track Editorial Team requested and received approval from the Ethernet Alliance (EA) Leadership to publish an EA White Paper fully explaining TFT. Because the objectives of the Ethernet Alliance is to promote rather than develop Ethernet Technology, the technical content of the TFT White Paper will be entirely based on 802.3dj material, summarized in the May '26 presentation appendices. It is therefore important that this content continue to get close review.

During this week, little time during the official meetings can be devoted to extensive explanations of TFT. However, Optical Track Editorial Team members, as well as myself, will be available for off-line discussions to make sure that TFT explanations are fully understandable. Please ask to meet with us if there is any aspect of TFT and the May '26 presentation appendices that is not clear. This will maximize the accuracy and clarity of the EA TFT White Paper.

Thank you

Chris

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