ISDN consistently delivers true 128k speeds. Cable offers a constant, always-on connection to the Internet. The speeds vary from area to area. It can be faster or slower depending on available bandwidth. The number of people in your area that share bandwidth deterimines the available bandwidth.
Cable is a bit like a party line or like a pipe.
If only a few people are using the pipe, everybody gets great service. The more people using the pipe the slower things get. There are also security issues. Everything is in this big pipe. Glen Johnson is a Software Trainer, Web Designer and Network Consultant.