DECA's "single pipe" is a spread spectrum modulated RF signal, which can't really be compared to twisted pairs directly, at the level you're trying to I don't think. The cloud is "Hub-like", since all DECAs receive the same signal, while the DECA outputs are "filtered", so they're more like a switch, and only output what the device connected wants/needs. Maybe it's just where this is viewed from: Inside the cloud is a hub function. Inside a switch isn't. Outside of the cloud is like a switch, not hub like.