SYSTEM Cited by 2 sources

IcePack / IceCube (Meta 102.4T liquid-cooled switch)

IcePack is Meta's first-generation liquid-cooled network rack, and IceCube is the 102.4-Tbps switch blade that populates it — Meta's 102.4T generation of open AI networking hardware, introduced at OCP Summit 2026. Together they are the physical substrate for the scale-out Flattened Planar Fabric and the building-scale fabrics that BAG aggregates.

IcePack (the rack)

• Built on OCP's ORV3-HPRv1 rack standard (Open Rack v3, High-Power variant).
• First liquid-cooled network rack at Meta — designed for the high power density and thermal efficiency gigawatt-scale AI clusters demand, where air-cooling the 102.4T generation would not fit the power/cooling envelope.

IceCube (the switch blade)

A sub-component of the IcePack generation, documented here on the parent page:

• 102.4 Tbps fabric switch = 128 × 800G non-blocking switching capacity.
• 2OU, PHY-less, hybrid liquid/air-cooled physical design; ships as IceCube and N-IceCube variants.
• Ships in two ASIC variants:
• Broadcom Tomahawk 6C
• NVIDIA Spectrum-6
• Both run Meta's open-source FBOSS network operating system, leveraging OCP SAI (Switch Abstraction Interface) — so one NOS controls either silicon.
• Represents a 2× bandwidth increase over Meta's 51.2T platforms while hitting the thermal density next-generation AI data centers require.

Why it matters

• Liquid cooling arrives in the network rack, not just the compute rack. Prior Meta liquid-cooling work (Catalina, Mount Diablo power rack) was compute-side; IcePack extends it to switching as bandwidth-per-rack doubles.
• Dual-silicon from day one. Offering Tomahawk 6C and Spectrum-6 variants of the same blade — both on FBOSS/SAI — is the SAI-enabled multi-vendor sourcing thesis made concrete at 102.4T (the same stance as DSF).
• The 102.4T floor for FPF and gigawatt clusters. IceCube's 128×800G non-blocking capacity is what makes the flattened 2-tier Clos of FPF — and the petabit BAG super-spine — buildable.

Seen in (wiki)

• sources/2026-10-12-meta-ocp-summit-2026-powering-ai-with-open-innovations-in-scale-up-scale-out-and-scale-across-networks — IcePack/IceCube debut; 102.4T, 128×800G, dual-ASIC, FBOSS/SAI, ORV3-HPRv1.
• sources/2026-10-26-meta-networking-at-the-2026-ocp-global-summit-open-innovatio-ff1684df — OCP Summit 2026 talk roundup adds the switch's 2OU, PHY-less, hybrid liquid/air-cooled design and the N-IceCube variant, and situates it in the integrated-optics program: dedicated talks on validating 51.2T co-packaged optics (CPO) and carrying lessons to 102.4T, linear pluggable optics (LPO) at hyperscale (removing the per-module retimer DSP tax at the cost of host-side equalization/triage), 800G active electrical cables (AEC) as the short-reach economics lever, and building the near-package optics (NPO) ecosystem. (Optics terms named at talk-abstract granularity — recorded as context, not pages.)

Related

• systems/fboss-meta-network-os — the NOS both IceCube variants run.
• systems/ocp-sai — the ASIC abstraction that lets one NOS drive Tomahawk 6C and Spectrum-6.
• systems/flattened-planar-fabric — the scale-out fabric IceCube switches build.
• systems/backend-aggregation-bag — the scale-across super-spine of the same generation.
• concepts/clos-topology — the fabric topology these switches form.
• companies/meta.