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|DSL stands for Digital Subscriber Line. It is the
transformation of standard telephone lines into high-speed conduits for voice,
data and video communications. DSL technology allows you to use the ordinary
copper telephone lines you already have in place in your business or home to
deliver dedicated high-speed Internet access, accelerated data communications
and one-/two-way video communications. In addition, these lines will still allow
you to make/receive regular phone calls as usual. DSL achieves this by splitting
the phone line into two frequencies: one for voice communications, such as
making and receiving phone calls, and the other for digital communications, such
as file sharing, high-speed Internet traffic, even live videoconferencing and
image transfer. One of the primary advantages of having DSL is that multiple
users in your organization (depending on the scale of service you choose) can
utilize the service simultaneously; they can be on the phone and on the Internet
all at the same time — all through one DSL line, all for one flat monthly
rate. The only requirement to DSL is that your location be within 3 miles of the
telephone company's central office.
Some benefits of DSL technologies are:
The DSL variation called ADSL (Asymmetric
Digital Subscriber Line) is called "asymmetric" because most of
its two-way or duplex bandwidth is devoted to the downstream direction, sending
data to the user. Only a small portion of bandwidth is available for upstream or
The DSL variation called SDSL (Symmetric Digital Subscriber Line) is called "symmetric" because it supports the same data rates for upstream and downstream traffic.
|What is the
difference between DSL and cable modems?
DSL provides always-available high-speed Internet access over a single dedicated telephone line. Cable modems offer high-speed Internet access over a shared cable television line.
While cable modems may have greater theoretical downstream (from the Internet to the home) bandwidth capabilities, that bandwidth is shared among all users in a neighborhood, and will therefore vary, perhaps dramatically, as more users in a neighborhood get online at the same time.
Upstream traffic (from the customer premise to the Internet) over cable modems will in many cases be slower than DSL, either because the particular cable modem is inherently slower, or because too many people in a neighborhood are trying to send or receive data at the same time - causing congestion in the local cable network.
Cable Modem Disadvantages: