AI Networking, UltraEthernet, the road to 1.6T and beyond.#

Matthew Thurbon (Arista)

• Why: Sits at the intersection of the PM's core interests: AI/HPC fabrics, lossless Ethernet design, next-generation optics (LPO), and the 800G→1.6T speed roadmap. UltraEthernet Consortium (UEC) is the emerging open-standards answer to InfiniBand for AI clusters — worth tracking for anyone in DC fabric work, since UEC's latency/lossless/reliability semantics will shape merchant Ethernet for AI back-end networks regardless of vendor.
• What: A survey of the design requirements AI applications impose on networks (bandwidth, scale, latency, energy), how UEC's open-standards approach addresses them, and the optics roadmap — specifically standards-based LPO transceivers and 800GbE/1.6TbE — that enables next-gen AI interconnect. (from abstract only)
• How: Architectural walkthrough of AI fabric requirements and the UEC transport specification direction, paired with the optical layer: LPO as a power/cost-reduced alternative to full DSP pluggables, and the 800G/1.6T port speeds those enable.
• Where applicable: Datacenter and AI/HPC fabric design generally. Vendor-presented (Arista), so expect the framing to favor Ethernet/merchant-silicon answers over InfiniBand, but the UEC and LPO content is standards-level and broadly relevant.