2. Introduction to How High-speed
Dial-up Works
● New technology offers a solution to the slow-
down that doesn't necessitate broadband.
● You can get connection speeds that are five
times faster than traditional dial-up service.
● High-speed dial-up providers can't do anything
about the modem handshake, but they can
speed up the software handshake.
3. High-speed Dial-up: Acceleration
Servers
● High-speed dial-up providers have come up
with some pretty clever ways to open up that
bottleneck.
● By sandwiching the acceleration server into the
chain between your dial-up connection and the
Web, they can speed up the process
considerably.
4. How a typical acceleration server
compresses different file types
● For text files, including the HTML text of a Web
page and the text in an e-mail message, the
acceleration server compresses the text on the
fly and sends it down your modem line.
● For image files, including GIF and JPG images
on Web pages as well as many banner ads, the
acceleration server reads the image from the
Web site and recompresses it to reduce its
size.
5. High-speed Dial-up: Caching
● The first time your browser loads a Web page,
it has to load the entire thing, along with all of
the images it displays.
● If the browser saves the images and text, then
the second time it loads the same page it can
check for duplicates.
● If an image has not changed, there is no need
to download it again.
6. How High-speed Dial-up Works
● It would seem that a clever combination of fairly
straightforward technologies has helped to
overcome some of the speed bumps of dial-up
Internet.
● These advances serve to prolong the life of
dial-up Internet and provide an alternative for
those who are tired of standard dial-up but not
quite ready for the leap to broadband.
● If these advances continue, dial-up may be
here to stay for quite a while.
