Advent internet rocks, because it uses Time Warner Cable as its primary internet source and Dasia as a backup connection running on an enterprise class firewall. This means that if Time Warner fails then the connection switches over seamlessly to Dasia. Dasia is wireless point to point from Advent straight to a data center downtown, so immune to any kind of physical breaks that could cause multiple providers to go down at once (e.g. car crashes into a pole, backhoe digs up a line, etc…).
On top of all that both lines and network equipment are protected from local power failure by battery backup.