DSL
In the past few years, DSL has emerged as one of the
technologies that can provide broadband services to homes. This technology can
support both high-speed data and voice at the same time. It also can support
data transfer rates of up to several megabits. Certain flavors of DSL can
deliver speeds of up to 52 Mbps.
These transfer rates are made possible by using unused
frequencies on copper telephone lines. The available bandwidth is divided into
frequency ranges. One frequency range is used for voice, another is used for
upstream data transmission, and another is used for downstream data
transmission. For example, voice uses the frequency range of 0 to 3.4 kHz, and
Asymmetric DSL uses the frequency ranges of 25 to 138 kHz in the upstream
direction and 170 to 1104 kHz in the downstream direction. Splitters are
sometimes used to separate these frequencies.
Another feature of DSL is that it is "always on." Unlike ISDN
and analog, no dial-in is required. This is an attractive feature, especially
for users who are accustomed to the cumbersome call setups and busy signals
associated with analog dialup services.
DSL offerings can be broadly divided into two categories:
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Asymmetric DSL
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Symmetric DSL
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