VR2R-0509_r1

VR2R-0509

① SA Source

• Source: 開啟完整 SA 文章
• Section: Rack Level Infrastructure: Power Delivery
• Line hint: 418

Context Before

First, VR NVL72 rack with an HVDC power rack running at 800VDC (Nvidia Spec) or +/-400VDC (OCP Spec). Since the VR NVL72 rack busbar is still running at 50V and the compute tray can only take in 50V, the 800VDC from the power rack cannot be directly delivered to the busbar. There would still be DC-DC power shelves in the VR NVL72 rack. The DC-DC power shelves will step down the voltage of the current from 800VDC to 50VDC.

Evidence

Second, some customers, namely Meta, may look to integrate their network switch rack with BBU and CBU shelves for efficiency and peak shaving.

Context After

This allows more CBU and BBU capacity that wouldn’t have been able to fit in the GPU rack. The BBU/CBU and switch rack will be connected to the GPU rack with 50V horizontal busbars. Meta calls this the high power rack, discussed at OCP.

② Atomic Claim

第二種情境是部分 customers，特別是 Meta，可能把 network switch rack 與 BBU、CBU shelves 整合，以提高 efficiency 並進行 peak shaving。

• Epistemic Mode: HYPOTHETICAL
• Mapping Status: PARTIAL

③ Semantic Frame

{
  "frame_type": "NARY_RELATION",
  "participants": [
    {
      "node": {
        "id": "02_companies/META",
        "label": "Meta"
      },
      "role": "customer"
    },
    {
      "node": {
        "id": "04_knowledge_base/BBU",
        "label": "BBU"
      },
      "role": "backup_power"
    },
    {
      "node": {
        "id": "04_knowledge_base/Capacitor Backup Unit (CBU)",
        "label": "CBU"
      },
      "role": "backup_power"
    }
  ],
  "qualifiers": {
    "condition_text": "hypothetical; network switch rack is plain text",
    "numeric_mentions": [],
    "temporal_mentions": []
  },
  "relation_type": "META_MAY_INTEGRATE_SWITCH_RACK_WITH_BBU_CBU"
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
customer	Meta	META
backup_power	BBU	BBU
backup_power	CBU	04_knowledge_base/Capacitor Backup Unit (CBU)

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。