VR2R-0563_r1

VR2R-0563

① SA Source

• Source: 開啟完整 SA 文章
• Section: Scale-Up Network - NVLink 6
• Line hint: 470

Context Before

High speed signals require better PCB materials, especially for NVLink 6 which has much lower tolerance for insertion loss given the use of bidirectional signaling. The number of lanes between the PaladinHD2 connectors and the NVLink Switch also creates complexity for PCB design.

Evidence

Hence, the NVLink 6 Switch board PCB is upgraded to 32 layers with M8+ graded CCL—minimally LDK2 glass fiber cloth or potentially Quartz fiber cloth.

Context After

Zooming out, backplane copper cables are used to connect NVLink Switch trays to the GPU trays for the VR NVL72 system. Although the bandwidth doubles, with bi-directional SerDes, the number of cables required does not change from the GB300 backplane generation to the Vera Rubin NVL72 backplane generation. The number of connectors and the number of DPs per connector also does not change from Grace Blackwell NVL72 to VR NVL72.

② Atomic Claim

因此，NVLink 6 Switch board 的 PCB 升級為 32 layers，採 M8+ grade CCL；至少使用 LDK2 glass fiber cloth，也可能採 Quartz fiber cloth。

• Epistemic Mode: HYPOTHETICAL
• Mapping Status: PARTIAL

③ Semantic Frame

{
  "frame_type": "NARY_RELATION",
  "participants": [
    {
      "node": {
        "id": "04_knowledge_base/NVLink",
        "label": "NVLink 6"
      },
      "role": "interconnect"
    },
    {
      "node": {
        "id": "04_knowledge_base/PCB",
        "label": "PCB"
      },
      "role": "board"
    },
    {
      "node": {
        "id": "04_knowledge_base/Copper-clad laminate",
        "label": "CCL"
      },
      "role": "laminate"
    }
  ],
  "qualifiers": {
    "condition_text": "hypothetical material specification; Quartz fiber cloth is plain text",
    "numeric_mentions": [
      "32",
      "M8+",
      "LDK2"
    ],
    "temporal_mentions": []
  },
  "relation_type": "NVLINK6_SWITCH_BOARD_PCB_MATERIAL_UPGRADE"
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
interconnect	NVLink 6	NVLink
board	PCB	PCB
laminate	CCL	04_knowledge_base/Copper-clad laminate

⑤ 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。