The DSL stand for Digital Subscriber Line. DSL provides high
speed on already exiting telephone lines and same time you
can use internet and as well as your line for phone. In DSL,
both ends of connections require the network cards and
DSL modems for data communication.
Your DSL connection to the Internet will always on, there is
not need to dial your ISP each time to use internet.
DSL is much easier to install and provides much faster data
transfer rate. Its data transmission speed start from 128
Kbps up to 10 Mbps. DSL
connections are more useful in applications like
videoconferencing, to run online movies and upload and
download heavy files.
There are different flavors of DSL like ADSL, R-ADSL,
HDSL, SDSL, and VDSL.
The ADSL and HDSL are very common in use, the former being
more popular for home usage.