xDSL - Digital Subscriber Line Technology (2)
The key in xDSL technology is modulation, a process in which one signal modifies a properties of another.
Hardware: DSL requires modems and splitters for end-users; carriers use DSLAMs (digital subscriber line access multiplexers)
Differences between xDSL technologies: speed, operating distance, applications, ratio between up and downstream
Different approaches: ATM-based ADSL, ISDN DSL. The important thing is what is running over xDSL...