why is dial up slower than high speed ?

Because the bandwidth is more narrow on dial-up. Bandwidth is like a pipe, the bigger the pipe, the more water you can push through it at one time.

Dial up is limited by both its physical size and the frequency that data can travel across it. When using broadband we can used modulation to send data over a larger distance with using less power. If you imagine a bass note, the note has a very large upper and lower curve. This note travels a much farther distance than the note of a chine. This larger note can carry more data at one time and over a larger distance. Since we also can carry data farther using broadband this eliminates the need to go through more switches and repeaters than narrow band does.

DSL is a dedicated line (telecommunications path between two points for use by a single customer.)----the path between the customer's dsl modem and the DSLAM is always active and is not shared with any other customer.

Whereas;

Dial up is the contrast-----is a data communication link that is only established as needed, allowing different customers to utilize the same link at different times so the speed is only limited.

Because high-speed is designed to be faster or they wouldn't call it 'high-speed'. The technologies that broadband uses were developed to address the shortcomings of dial up, namely the speed and fact that it takes time to connect.

dial up is slower because it has a smaller bandwidth then highspeed has.

High speed travels at mbits its comcastic

its from a phone line, they are slow, like fat people