PSTC: Services: DSL vs. Cable

Security: All cable modem users use a single coax line, creating a serious risk of wiretapping, easy access for hackers and firewall protection. With DSL, your line is exclusively dedicated to you.
Reliability: Cable services are infamous for reliability problems. Anyone who has sat through a thunderstorm knows that cable is the first to go out. Cable outage can bring down modem service for an entire neighborhood. Telephone lines are much more dependable.
Stability: Because cable modems are on shared bandwidth, the more subscribers who log on, the slower the servie will become. Again, with DSL your line is exclusively dedicated to you.
Home Wiring: Most homes do not have their computers next to their cable outlets. However, they are near phone jacks. A cable subscriber may need expensive re-wiring to get a connection between the cable and the PC. Most potential DSL subscribers are already using dial-up modems, and their wiring is already set up.
Availability: All homes and businesses are passed by the public service network, and the background network for DSL is already in place. Cable services do not reach all locations.