Telephone System for Office

The term DSL is short for Digital Subscriber Line. It
provides the transmission of data over the wires of a local
telephone network.

DSL, originally, was the abbreviation for digital subscriber
loop, but the name was changed to Digital Subscriber Line, as
it was, a more market friendly term, for the most popular
version of the recently introduced consumer ready DSL.

The speed of downloading, of a consumer service of DSL,
ranges from about two hundred and fifty kilobytes per second to
twenty four thousand kilobytes per second. This depends on the
technology of DSL, the conditions of the line being used and
the level of service implemented. Generally, the speed of
uploading is lower than the speed of downloading for ADSL
(Asymmetric Digital Subscriber Line). It is equivalent to the
downloading speed of SDSL (Symmetric Digital Subscriber
Line).

The technology connects a computer with the Internet via the
existing copper telephone lines. Special equipment is used to
modulate digital information, at the centralized telephone
office and the modem of DSL connected to the computer system in
use. This equipment then sends the modulated information,
through phone lines, using unused frequencies. Regular signals
of voice are transmitted across the telephone lines at
frequencies that range from zero to four kilohertz.

Since a standard dial up modem, uses the frequencies similar
to those of voice, the rate of transmission of data is limited.
On the other hand, a DSL Telephone utilizes frequencies that
range between twenty-five kilohertz to one megahertz. The
bandwidth is extra, this means that the DSL telephones can send
much more data through the same connection of copper wire. The
signals of telephones and DSL can very comfortably exist on the
same line, which is under usage. A micro filter of DSL is
installed at every outlet that is used for making telephone
calls.

Most of the DSL Telephone modem packages provide small
filters for in lining. These DSL modems are readily available
at any store that sells computers or electronics. The filter of
DSL telephones takes care any signals that are unwanted by the
user, and that are picked by the telephone and transmitted as
static signals to the user. The technology also provides
notable improvements in the speeds of Internet over those that
are provided by the standard dial up modems connections. The
best advantage that a user gets, by using a DSL Telephone, is
that the signals of DSL are always on, whether the attached
computer is on or not.