The connection capacity of these technologies is up to 32 Mbps when data is downloaded and up to 1 Mbps of upload bandwidth. Initial services offered in North America offer about 1 Mbps of bandwidth, with faster connection speeds promised as the technology become more widespread. DSL works over conventional phone lines and is a direct digital connection from you to the Internet service provider, normally the phone company. It doesn't interrupt regular voice calls. Cable modem technology offers similar speeds, though bandwidth is shared in a neighborhood.
Data comes in through a cable TV connection off a loop that runs through a neighborhood.
The more of your neighbors on that loop, the less bandwidth available to you. There's no dial-up connection necessary and companies that offer this service provide it on a flat rate. When a computer is connected to the Internet with one of these technologies, it can be seen by outsiders and needs to be protected by a firewall, a hardware or software solution that filters traffic between the computer and the Internet.