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In today's meeting,
Michael He showed there are conditions under which TDECQ gives an erroneous value and suggested a BER based alternative. While we likely won't get agreement in this meeting to add another TDECQ methodology, engineers have a way to get around this problem
if they encounter it in the lab.
At the September interim, in the FRx based test proposal, several scenario examples were given in Appendix 1.
The Cl 183 (page 15) line 4 example shows an excessively high TDECQ. This results in setting the Tx_OMA too high, wasting power, and is exposed by the FRx test resulting in an excessive margin to mask. This is exactly the case that Michael details in his
presentation. Line 5 then shows how to the problem is fixed; use a different TDECQ value derived from a BER based measurement, in this case FRx test.
Chris
From: Mark Nowell (mnowell) <00000b59be7040a9-dmarc-request@xxxxxxxxxxxxxxxxx> on behalf of Mark Nowell (mnowell) <mnowell@xxxxxxxxx>
Sent: Tuesday, November 11, 2025 3:01 AM To: B400G OPTX <stds-802-3-B400G-optx@xxxxxxxxxxxxxxxxx>; 802.3 calendar <802d3.mtg@xxxxxxxxx> Cc: Jim Weaver <jweaver@xxxxxxxxxx>; Jeffery Maki <jmaki@xxxxxxxxxxx>; Marshall, John <John.Marshall@xxxxxxx>; Ahmad El-Chayeb <ahmad.el-chayeb@xxxxxxxxxxxx>; Frank Chang <frank.chang@xxxxxxxxxxxxxxxxxxx>; Li, Mike <peng.li@xxxxxxxxxx>; Gary Nicholl (gnicholl) <gnicholl@xxxxxxxxx>; Kenneth Jackson <KJackson@xxxxxxxxxxxxxx>; derek.cassidy@xxxxxx <derek.cassidy@xxxxxx>; Brian Welch (bpwelch) <bpwelch@xxxxxxxxx>; Curtis Ridgeway <curtis.ridgeway@xxxxxxxxxx>; KIMBARA Tatsuki (金原 ?生) <t.kimbara@xxxxxxxxxxxxxxxxx>; Andy Moorwood <andy.moorwood@xxxxxxxxxxxx>; Hansel DSilva <Hansel.D'Silva@xxxxxxxxxxxxxxxx>; John Johnson <jejohnson@xxxxxxxx>; Connaughton, Mike <Mike.Connaughton@xxxxxxxxxxx>; Dimitris Filippou <dfilippou@xxxxxxxx>; David Cassan <david.cassan@xxxxxxxxxxxxx>; Haim Ben Amram <haimba@xxxxxxxxx>; Matt Brown <matt.brown@xxxxxxxxxxxxx>; Sorbara, Massimo <Massimo.Sorbara@xxxxxxxxxxxxxxxxxxx>; Marco Mazzini (mmazzini) <mmazzini@xxxxxxxxx>; Stephen Didde <stephen_didde@xxxxxxxxxxxx>; Tiger Ninomiya <tiger.ninomiya@xxxxxxxxxxxx>; Carlo Tosetti (ctosetti) <ctosetti@xxxxxxxxx>; derek.2.cassidy@xxxxxx <derek.2.cassidy@xxxxxx>; mohamed.shaaban@xxxxxxxxxxx <mohamed.shaaban@xxxxxxxxxxx>; Mark Kimber <MKimber@xxxxxxxxxxx>; Sankarshanan, Balaji <Balaji.Sankarshanan@xxxxxxxxxxxxxxxx>; Qing Xu <qing@xxxxxxxxxxx>; Hessam .Mohajeri <hessam.mohajeri@xxxxxxxxx>; Matt Brown <mbrown8023@xxxxxxxxx>; Rajagopal (KR), Karthik <krthik@xxxxxx>; Ali Ghiasi <ali@xxxxxxxxxxxxxxxxx>; Fukushima Takahito <Takahito.Fukushima@xxxxxxxxxxxxx>; Ernest Muhigana <ernest.muhigana@xxxxxxxxx>; Pirooz Tooyserkani (pirooz) <pirooz@xxxxxxxxx>; Mark Gustlin (mgustlin) <mgustlin@xxxxxxxxx> Subject: [EXTERNAL]: [802.3_B400G_OPTX] *** Optical Track Wednesday *** IEEE P802.3dj Task Force meeting When: Tuesday, November 11, 2025, 6:30 PM to Wednesday, November 12, 2025, 3:00 AM. Where: https://cisco.webex.com/cisco/j.php?MTID=mc7dcbe0ca3775bfa4f4b3ae68ea0ddae *** OPTICAL TRACK - Wed **** Meeting invite for the specific optical track meetings within the broader P802.3dj Task force meetings The IEEE P802.3dj Task Force will meet face-to-face Monday (10 Nov) through Thursday (13 Nov) during the IEEE 802 Nov 2025 Plenary session (Nov 10-14) in Bangkok, Thailand with remote access (provided on best effort basis). Details regarding meeting and registration may be found athttps://802world.org/plenary/ [802world.org] . Please note that registration and payment of the registration fee is required for all individuals who participate (in-person or virtual participation). The draft agenda for this meeting will be: ● The consideration of comments submitted against D2.2 during the second Working Group Ballot recirculation. Note - Any presentation requests not addressing comments against the draft will be heard pending time availability. As a reminder, all meeting participants should review the following documents prior to participation in an interim meeting teleconference: ・ IEEE SA patent policy ・ IEEE SA Copyright Policy ・ IEEE SA Participation Policy All of these policies may be found at http://ieee802.org/3/policies.html [ieee802.org].
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