Decentralization: Why Dumb Networks Are Better The smart choice is innovation at the edge
“Every device employed to bolster individual freedom must have as its chief purpose the impairment of the absoluteness of power.” — Eric Hoffer
In computer and communications networks, decentralization leads to faster innovation, greater openness, and lower cost. Decentralization creates the conditions for competition and diversity in the services the network provides.
But how can you tell if a network is decentralized, and what makes it more likely to be decentralized? Network “intelligence” is the characteristic that differentiates centralized from decentralized networks — but in a way that is surprising and counterintuitive.
Some networks are “smart.” They offer sophisticated services that can be delivered to very simple end-user devices on the “edge” of the network. Other networks are “dumb” — they offer only a very basic service and require that the end-user devices are intelligent. What’s smart about dumb networks is that they push innovation to the edge, giving end-users control over the pace and direction of innovation. Simplicity at the center allows for complexity at the edge, which fosters the vast decentralization of services.
Surprisingly, then, “dumb” networks are the smart choice for innovation and freedom.
The telephone network used to be a smart network supporting dumb devices (telephones). All the intelligence in the telephone network and all the services were contained in the phone company’s switching buildings. The telephone on the consumer’s kitchen table was little more than a speaker and a microphone. Even the most advanced touch-tone telephones were still pretty simple devices, depending entirely on the network services they could “request” through beeping the right tones.
In a smart network like that, there is no room for innovation at the edge. Sure, you can make a phone look like a cheeseburger or a banana, but you can’t change the services it offers. The services depend entirely on the central switches owned by the phone company. Centralized innovation means slow innovation. It also means innovation directed by the goals of a single company. As a result, anything that doesn’t seem to fit the vision of the company that owns the network is rejected or even actively fought.
In fact, until 1968, AT&T restricted the devices allowed on the network to a handful of approved devices. In 1968, in a landmark decision, the FCC ruled in favor of the Carterfone, an acoustic coupler device for connecting two-way radios to telephones, opening the door for any consumer device that didn’t “cause harm to the system.”