Bonding for speed
From the Internet to you. AAISP use FireBrick FB6000 routers to manage ADSL connections. This manages the bonding of traffic from AAISP to your location. IP blocks (configured on Clueless) can be routed to multiple lines on your login. for fallback, the FB6000 will stop routing IPs down a line that is off line, and from the Control Pages you can control which lines are used. Speed wise, the FB6000 will route based on the speed of the line - so if you have a 10M line and a 5M line, then the traffic will be weighted correctly (i.e. 1/3 on the 5M line, and 2/3 on the 10M line.)