SA260324R-0185_r1

SA260324R-0185

① SA Source

• Source: 開啟完整 SA 文章
• Section: Inter-rack
• Line hint: 223

Context Before

Lastly, there is the inter-rack C2C. Each LPU has 4x100G lanes that go to the OSFP cages to connect LPUs across 4 racks. There are various configurations that can be used for this inter-rack scale up. One option is 4x100G from each LPU going to one OSFP cage, each OSFP escaping 800G of C2C from 2 LPUs.

Evidence

However, for greater fan out the preferred configuration seems to be each 100G lane from the LPU going to 4 individual cages, with each cage escaping 800G of C2C from 8 LPUs.

Context After

In terms of how the racks are networked together it appears to be a daisy chain configuration, with each Node0 connected to 2 other Node 0. This can all be achieved within the reach of 100G AECs, though optics can be used if necessary.

② Atomic Claim

若要更大的 fan-out，偏好的 configuration 看起來是讓 LPU 的每條 100G lane 分別連到 4 個 cage；每個 cage 會從 8 顆 LPU 對外導出 800G 的 C2C。

• Epistemic Mode: ASSERTED
• Mapping Status: PARTIAL

③ Semantic Frame

{
  "frame_type": "NARY_RELATION",
  "participants": [
    {
      "node": {
        "id": "04_knowledge_base/100G",
        "label": "100G"
      },
      "role": "lane_rate"
    },
    {
      "node": {
        "id": "04_knowledge_base/Groq LPU",
        "label": "LPU"
      },
      "role": "accelerator"
    },
    {
      "node": {
        "id": "04_knowledge_base/800G",
        "label": "800G"
      },
      "role": "aggregate_bandwidth"
    },
    {
      "node": {
        "id": "04_knowledge_base/Chip-to-Chip Interconnect",
        "label": "C2C"
      },
      "role": "protocol"
    }
  ],
  "qualifiers": {
    "condition_text": "cage 類型承接前文 OSFP，但本 fragment 未再次 canonical link",
    "numeric_mentions": [
      "100G",
      "4",
      "8",
      "800G"
    ],
    "temporal_mentions": []
  },
  "relation_type": "HIGH_FANOUT_INTERRACK_CONFIGURATION"
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
lane_rate	100G	100G
accelerator	LPU	04_knowledge_base/Groq LPU
aggregate_bandwidth	800G	800G
protocol	C2C	04_knowledge_base/Chip-to-Chip Interconnect

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。