Bandwidth is dedicated, not shared, between the users home and central office. Up to 30 Mbps downstream, engineered for sharing between 500-2,000 users. Service deterioration will happen if a large number of users attempt simultaneous transmission. Also, Copper passes the entire customer base.
Cable is a shared medium that is subject to eavesdropping and service theft.
DSL is scaleable to any copper-based customer. An access node can be installed into an area when economically justified. Current cable modems do not provide for voice and require an analog modem for upstream communications which. DSL modems only affect a single user if malfunctioning. A CATV line cut will bring down all users on that line.