ICI · Inter-Chip Interconnect
Google's TPU scale-up link, wiring chips into a torus instead of an all-to-all crossbar, so coherent domain size comes from topology and optical switching rather than a central switch tier.
Current numbers
9,216 chipsGoogle Ironwood (TPU v7) scale-up superpod via ICI (9.6 Tb/s/chip) + OCS (48 units, 13,824 ports)