What
is DSL?
DSL (Digital
Subscriber Line) is an always-on Internet connection that ends
in a socket on your wall, that looks much like a phone socket.
At least in the US, the socket is exactly a phone socket, and,
for the popular residential DSL, (ADSL), the same house wiring
does indeed carry phone and data!
DSL is billed
per month usually for a fixed price and for the majority of providers
for unlimited usage. In other words whether you use it for email
once a day, or you are a net addict and use it constantly your
bill is always the same.
Once you have
a DSL line you can use the entire resources of the Internet in
the same way as you did from a regular modem connecting to an
ISP. You can use the service 24 hours a day with no connection
delay, without a 'username' and 'password', and without a busy
signal or any connection/disconnection process.
The key advantage
of DSL over modem is speed. DSL is from several, to dozens of
times faster than a modem connection. A complex web page that
could take up to a minute to finish loading can appear in just
seconds over DSL.
Connection
speed, reliability, and the 'always-on' nature of DSL are the
main reasons it is so popular. For small businesses DSL is also
a great way to save money compared ISDN services or expensive
T1 lines.