clm_ef86f9ecf7164f23b4adba77e759e438_r3

VR2R-0540

回到這篇 SA Coverage

① SA Source

• Source: 開啟完整 SA 文章
• Section: Bi-directional SerDes for Scale-Up
• Line hint: 681

Context Before

Blackwell Copper Backplane ↗, Source: Nvidia

Evidence

NVIDIA could also opt to deploy wider racks instead as is the case of AMD’s Helios rack ↗, but this could affect the signal integrity on the PCB as electrical signals will have to traverse a longer path.

Context After

Scale-Up Network – NVLink 6

The bidirectional SerDes technology employed on the copper backplane is used for NVIDIA’s scale-up network. For Vera Rubin NVL72, the scale-up network continues to be rail-optimized with all-to-all connectivity between each GPU and switch ASIC in the scale-up domain.

② Atomic Claim

採用更寬 rack 也可能影響 PCB 上的 signal integrity，因為 electrical signals 必須走更長的 path。

• Epistemic Mode: HYPOTHETICAL
• Mapping Status: PARTIAL

③ Semantic Frame

{
  "attribute": "WIDER_RACK_SIGNAL_INTEGRITY_RISK",
  "context_nodes": [],
  "entity": {
    "id": "04_knowledge_base/PCB",
    "label": "PCB"
  },
  "frame_type": "ATTRIBUTE",
  "qualifiers": {
    "condition_text": "hypothetical wider-rack alternative from preceding claim",
    "numeric_mentions": [],
    "temporal_mentions": []
  },
  "value": {
    "numeric_mentions": [],
    "value_text": "wider racks could hurt signal integrity because electrical signals must traverse a longer path."
  }
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
entity	PCB	PCB

⑤ V2 Draft（需要修正時直接編輯）

Inline repair

只編輯以下三個 Draft 區塊。完成後將 review_action 設為 REQUEST_REPAIR，再手動執行 Repair Preview。
執行腳本前，Draft 不會寫入 Claim Store 或 Graph。

V2 Atomic Claim Draft

採用更寬 rack 也可能影響 PCB 上的 signal integrity，因為 electrical signals 必須走更長的 path。

V2 Semantic Frame Draft

{
  "attribute": "WIDER_RACK_SIGNAL_INTEGRITY_RISK",
  "context_nodes": [],
  "entity": {
    "id": "04_knowledge_base/PCB",
    "label": "PCB"
  },
  "frame_type": "ATTRIBUTE",
  "qualifiers": {
    "condition_text": "hypothetical wider-rack alternative from preceding claim",
    "numeric_mentions": [],
    "temporal_mentions": []
  },
  "value": {
    "numeric_mentions": [],
    "value_text": "wider racks could hurt signal integrity because electrical signals must traverse a longer path."
  }
}

V2 Revision Metadata Draft

{
  "epistemic_mode": "HYPOTHETICAL",
  "mapping_status": "PARTIAL"
}

⑥ Human Review

請在 Properties 逐項確認：

• 原文 → Atomic Claim 是否忠實
• Atomic Claim → Semantic Frame 是否忠實
• Canonical Entity mapping 是否正確
• Epistemic mode 是否保留原文語氣
• 最後選擇 review_action

Review state

Markdown 內文不是正式 approval。只有 Apply bridge 寫入的 Decision Ledger event 才是正式決策。