sfx2000
Part of the Furniture
I was going to link to that same article.
In essence, the main CPU is a dual core Broadcom and then they've added local processors on each of the 3 bands for a total of 5 CPU cores.
Basically they're offloading all wifi processing to a standalone CPU on each radio.
This is fairly common in enterprise route/switch gear.
Most 802.11ac chipsets have a dedicated ARM core to handle the MAC functions for the wireless stack - been that way for a while now - Broadcom is counting those cores, along with the dual-core implementation in the main CPU.
Going by the same logic - most 802.11ac current routers are quad-core implementations now - that includes the Asus, Netgear, Linksys, and Apple 802.11ac gear...
marchitecture, eh?
sfx