PDF 原檔：報告_OCP2026_立訊_400G電氣銅互連_20261015_original.pdf
講者公開簡報（OCP 官方 Recorded Content 頁提供下載）。文字以 PyMuPDF 逐頁抽取，
### p<n>為頁碼；圖表內容見原檔。
圖片清單（已驗證 2026-10-19）
| 檔名 | 頁 | 分類 | 親眼所見內容 |
|---|---|---|---|
報告_OCP2026_立訊_400G電氣銅互連_20261015_p5.png |
p5 | 真資料圖 | Elastomeric-Based CPC 說明：CPC 模組裝在基板四邊、藍色線排向外延伸的 3D 示意，另有連接器本體與接點面照片；文字標 stubless、120+GHz 無共振、360 度屏蔽、差分對間距 1.9mm x 1.7mm |
報告_OCP2026_立訊_400G電氣銅互連_20261015_p6.png |
p6 | 真資料圖 | 300mm 31AWG CPC-CPC 纜線組件量測：實驗板照片與鏈路方塊圖，左圖未去嵌入 SDD21 約 -33dB@110GHz，右圖去嵌入後約 -14dB@110GHz，兩條曲線 A4／A5 重合平滑 |
報告_OCP2026_立訊_400G電氣銅互連_20261015_p10.png |
p10 | 真資料圖 | Twinax-Twinax 對接結構：27AWG DAC 纜與 31AWG CPC 纜對接示意；纜線背板用垂直 header（cartridge）與 receptacle；前面板 DAC 用 plug（標 PWR 18A、4 個低速針）與 receptacle |
報告_OCP2026_立訊_400G電氣銅互連_20261015_p12.png |
p12 | 真資料圖 | 448G 纜線背板連接器首批樣品實物照：對接後整體、448G Cable Header 與 Cable Receptacle 端面（雙孔差分接點陣列） |
報告_OCP2026_立訊_400G電氣銅互連_20261015_p13.png |
p13 | 真資料圖 | 纜線段初測：330mm 31AWG + VH-VR 連接器 + 940mm 27AWG + 330mm 31AWG 串接，SDD21 曲線 0 到 110GHz 逐步下降，90GHz 處約 -35dB（標記點），100GHz 後出現起伏；右為實物鋪設照 |
報告_OCP2026_立訊_400G電氣銅互連_20261015_p14.png |
p14 | 真資料圖 | LR 前面板段初測：Koolio CPC + 240mm 31AWG + 前面板連接器 + 525mm 27AWG + 240mm 31AWG 串接；Non-deembedded 約 -30dB@60GHz、-50dB@100GHz，deembedded 約 -18dB@60GHz、-30dB@90GHz，100GHz 附近有起伏；右為實物照 |
原始內容
p1
Andrew Kim Luxshare-Tech Jinhua Chen Luxshare-Tech Copper Interconnect Innovations for Realizing 400G Electrical SERVER: OPEN CHIPLET ECONOMY
p2
• Industry racing to define a 400G/lane interconnect, e.g. OIF CEI-448G and IEEE 400GPL – SI specs on the copper channel will be challenging • To assist, we want to advise where we are in terms of our best VSR/C2M and LR/CR/KR channel candidates • Twin-ax will serve as the primary medium for the bulk of the 400G channel • Connectors will be the primary limiting element – Board—to—Twinax, e.g. CPC, NPC, or on an active front-panel module – Twinax—to—Twinax, e.g. front panel DAC or cable backplane • Elastomeric-based CPC showing excellence SI performance • Backplane-adapted twinax-twinax mating structure showing promising performance Intro/Overview
p3
• Better choice (vs PCB) for traversing the bulk of the channel length – Lower loss-per-meter than PCB – Fewer impedance discontinuities → better BW & ILD Twinax Cabling Spiral Poly Jacket Longitudinal Shield Spiral Buffer Low Loss Insulation Silver Plated Copper Conductors
p4
• Need a good set of connectors that also have high fidelity • CPC get from chip to port over the internal cabling • front panel / backplane connector for shelf-to-shelf external cabling – Cable-to-cable variant for DAC and cable backplane – Cable-to-PCB variant for chip-based applications, e.g. optics/AEC/ACC Puts the Onus On Producing a Suite of Good Connectors
p5
• Introduced at 2024 and 2025 OCP Global Summits to excellent reception • Stubless interface affords high BW – no resonance out to 120+GHz • Full 360 shielding along entire length of channel → high crosstalk isolation • Dense (1.9mm x 1.7mm) diff pair pitch Elastomeric-Based CPC
p6
• Number of improvements have been made in the last year (but all internal to conn.) • DUT is a 300mm CPC-CPC cable assembly: • Smooth IL out to the 110GHz measurement capabilities of the VNA – No resonance – Very low ILD CPC Channel Performance
p7
• RL is quite clean (generally below -10dB) • Mode conversion is well- controlled Return Loss and Mode Conversion
p8
• 5 times: remove & reseat connector • Very minimal SI variation • Min-Max delta of 0.51 dB Repeated Mating
p9
• Crosstalk based on a 2x3 diff pair subset model – 2 NEXT adjacent neighbors (substrate side) – 3 FEXT from the other row (cable side) • Improved shielding reduces the coupling across the entire band • Pushes the peak response out from 110GHz to 120GHz – And it’s ~15dB lower Crosstalk Simulation
p10
• Serves as the core component of either a cable backplane or front-panel DAC interface Twinax—Twinax Mating Structure Cable Backplane Application Front Panel DAC Application
p11
• Mating structure can also be incorporated to a paddle card in the plug – E.g. AOC, AEC, ACC Paddle Card Application Plug Plug Tip (from above) Plug Tip (from below) Mated Plug-Receptacle
p12
First Samples Built of Cable Backplane Connector 448G Cable Header 448G Cable Receptacle
p13
• Clean response out to 100GHz • No resonance until just at 110GHz Initial Measurement of Cabling Segment Twinax Test Fixture 330mm 31awg Twinax Mated VH-VR Conn Twinax Test Fixture 940mm 27awg Twinax Mated VR-VH Conn 330mm 31awg Twinax
p14
• Clean response out to 100GHz • No major resonance • Prelim sample, manufacturing process being refined to improve tolerance issues • On demo at booth A31 Initial Measurement of LR Segment (Front Panel) 240mm 240mm 525mm Koolio CPC 240mm 31awg Twinax Front Panel Conn Koolio CPC 525mm 27awg Twinax Front Panel Conn 240mm 31awg Twinax
p15
• 400G/lane electrical solutions being built around high performance twin-ax – Lower loss & ILD, and better bandwidth • We presented candidates for the array of accompanying connectors needed – CPC is getting quite advanced with clean response out to 120GHz • First instance of the twinax—twinax are quite promising especially given the known manufacturing issues being fixed at the moment • PAM-6 (90GHz) looks to be viable in the very near term • PAM-4 (112GHz) also looks within reach • Experience a live SI demo of the LR-style connection at Luxshare-Tech’s booth (A31) Summary
p16
• AI demands accelerating the need for 400G/lane links, and to keep the power down, copper is need for shorter link segments • Standards bodies (OIF & IEEE) have formally started in the past year to define the specifications • Interconnect vendors to work with OCP server project group on connector & channel loss information to facilitate adoption of 400G (and 256G) per lane based links – Mechanical drawings – SI characteristics • Additional information: – OIF CEI-448G Framework Launch (link) – IEEE 400GPL Study Group (link) – Luxshare-Tech’s Designcon’26 Tutorial on 224G and 448G interconnects (link) – Luxshare-Tech’s OCP’25 400G Presentation (link) Call to Action
p17
Thank You!