In our previous article, we examined the reasons why cabled AI expansion frequently degrades under narrow physical interconnects, like OCuLink and conventional host-routed topologies. Delivering unthrottled line-rate throughput requires both physical interconnects and an autonomous downstream switching fabric capable of direct, hardware-level Peer-to-Peer (P2P) DMA. Once the physical cabling and routing primitives are in place, AI infrastructure architects will face the follo