VR2R-0520
① SA Source
- Source: 開啟完整 SA 文章
- Section:
Bi-directional SerDes for Scale-Up - Line hint:
647
Context Before
Let’s step through key features of Rubin’s networking and the architectures that are likely to be built around Rubin scale-up and scale-out networks.
Bi-directional SerDes for Scale-Up
Evidence
The doubling of bandwidth per logical GPU from NVLink 5 in GB300 NVL72 to NVLink 6 in Vera Rubin NVL72 are made possible by using a simultaneous bi-directional SerDes for the copper backplane instead of increasing the modulation or baud rate. Whereas NVLink 5 delivers 224G per electrical lane, NVLink 6.0 delivers 448G per electrical lane. Each electrical lane is one differential pair (DP) consisting of two conductors that carry equal magnitude, and opposite polarity signals.
Context After
Source: Nvidia VR NVL72 Component BoM and Power Budget Model ↗
② Atomic Claim
每個 electrical lane 是一組 differential pair（DP），由兩條 conductors 組成，兩者承載 magnitude 相等、polarity 相反的 signals。
- Epistemic Mode:
ASSERTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"frame_type": "CLAIM_ONLY",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [
"2"
],
"temporal_mentions": []
},
"reason": "GENERAL_DIFFERENTIAL_PAIR_DEFINITION_WITHOUT_CANONICAL_ENTITY",
"statement": "each electrical lane is one differential pair consisting of two conductors carrying equal-magnitude, opposite-polarity signals."
}④ Canonical Entity Mapping
- 此
CLAIM_ONLYrevision 沒有 canonical Entity mapping。
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
每個 electrical lane 是一組 differential pair（DP），由兩條 conductors 組成，兩者承載 magnitude 相等、polarity 相反的 signals。
V2 Semantic Frame Draft
{
"frame_type": "CLAIM_ONLY",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [
"2"
],
"temporal_mentions": []
},
"reason": "GENERAL_DIFFERENTIAL_PAIR_DEFINITION_WITHOUT_CANONICAL_ENTITY",
"statement": "each electrical lane is one differential pair consisting of two conductors carrying equal-magnitude, opposite-polarity signals."
}V2 Revision Metadata Draft
{
"epistemic_mode": "ASSERTED",
"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。