clm_666940ce44af4608b478cac7177ffc65_r1

VR2-0310

① SA Source

• Source: 開啟完整 SA 文章
• Section: Relocating ConnectX-9
• Line hint: 411

Context Before

Source: Nvidia VR NVL72 Component BoM and Power Budget Model ↗

Evidence

Previously – having to transmit a 200G Ethernet/InfiniBand signal from the NIC in the back half of the compute tray to the OSFP cage in the front of the compute tray necessitated the use of flyover cables as the signal loss over PCB at 200Gbit/s (uni-directional) per lane is too high

Context After

But now that the NIC is closer to the OSFP cage, the lower speed PCIe Gen6 signal (64Gbit/s per lane uni-directional) travels the longer distance. By making the PCIe Gen6 signal longer, the signal can travel over PCB given that PCIe Gen6 has better signal integrity than the higher speed 200G Ethernet/InfiniBand signal.

PCB vs Flyover Cables

② Atomic Claim

過去若要把每 lane 200Gbit/s 單向的 200G Ethernet／InfiniBand signal，從 compute tray 後半部的 NIC 傳到 compute tray 前方的 OSFP cage，就必須使用 flyover cables，因為該速率下經 PCB 傳輸的 signal loss 過高。

• Epistemic Mode: ASSERTED
• Mapping Status: COMPLETE

③ Semantic Frame

{
  "frame_type": "NARY_RELATION",
  "participants": [
    {
      "node": {
        "id": "04_knowledge_base/200G",
        "label": "200G"
      },
      "role": "user_or_subject"
    },
    {
      "node": {
        "id": "04_knowledge_base/Ethernet",
        "label": "Ethernet"
      },
      "role": "used_entity"
    },
    {
      "node": {
        "id": "04_knowledge_base/InfiniBand",
        "label": "InfiniBand"
      },
      "role": "used_entity"
    },
    {
      "node": {
        "id": "04_knowledge_base/Compute Tray",
        "label": "compute tray"
      },
      "role": "used_entity"
    },
    {
      "node": {
        "id": "04_knowledge_base/NIC",
        "label": "NIC"
      },
      "role": "used_entity"
    },
    {
      "node": {
        "id": "04_knowledge_base/OSFP (Octal Small Form-factor Pluggable)",
        "label": "OSFP"
      },
      "role": "used_entity"
    },
    {
      "node": {
        "id": "04_knowledge_base/Flyover cable",
        "label": "flyover cables"
      },
      "role": "used_entity"
    },
    {
      "node": {
        "id": "04_knowledge_base/PCB",
        "label": "PCB"
      },
      "role": "used_entity"
    }
  ],
  "qualifiers": {
    "condition_text": null,
    "numeric_mentions": [
      "200Gb",
      "200"
    ],
    "temporal_mentions": []
  },
  "relation_type": "USES"
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
user_or_subject	200G	200G
used_entity	Ethernet	Ethernet
used_entity	InfiniBand	InfiniBand
used_entity	compute tray	04_knowledge_base/Compute Tray
used_entity	NIC	NIC
used_entity	OSFP	04_knowledge_base/OSFP (Octal Small Form-factor Pluggable)
used_entity	flyover cables	04_knowledge_base/Flyover cable
used_entity	PCB	PCB

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。