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ADSL
ADSL harnesses the power
of advanced DSL (Digital Subscriber Line) technology to
deliver radically new standards of Internet connection
speed, reliability and cost-effectiveness to the business
user.
A standard BT analogue telephone line is transformed into a high-speed digital
broadband service operating at up to 2Mbps. It provides continuous Internet
connection, and is capable of downloading data up to 40 times faster than conventional
modems and 15 times faster than ISDN-2.
How ADSL operates
Digital Subscriber Line technology utilises the redundant capacity of a standard
copper wire BT telephone line. Special DSL-enabled modems are installed at
the customer's premises and at the local telephone exchange, establishing the
Internet connection without affecting the line's normal functionality.
In the case of ADSL, the asymmetric configuration of the connection
allows data to flow more rapidly from the Internet to the customer's PC. This
makes the service particularly effective for Internet browsing and for downloading
large data files or software upgrades.
Key features and benefits
Always-on Internet access
ADSL provides continuous, 24 hours-a-day connection to the
Internet, eliminating the time-wasting delays and frustrating connection failures
associated with dial-up connections. To work online, a simple click on the
PC's Internet browser icon gives immediate Internet access.
Broadband performance and versatility
With its rapid data transfer capability, ADSL allows users
to exploit the full business potential of the Internet. Its many applications
include:
- downloading complex multi-media data from websites
at unprecedented speed
- reducing the time required for software downloads
- receiving graphics-rich presentations in a matter of
minutes
- taking advantage of the latest videoconferencing facilities
- conducting e-commerce efficiently and securely
- enabling branch offices and teleworkers to access a
company's network transparently via VPN (virtual private
network) technology
Simultaneous telephony and Internet access
ADSL utilises previously unused capacity in the telephone
line. This means that voice calls and fax transmissions can still be made and
received, even when working online. In addition, multiple users can log on
to the same high-speed ADSL connection.
No usage-based costs
ADSL replaces usage-based dial-up or ISDN charging with a
competitive flat-rate connection and monthly rental charge, making the service
an economical alternative to investment in private leased lines.
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