ADSL

What is ADSL?

First we proceed further, the abbreviation of ADSL is "Asymmetric digital subscriber line". It is type of "Digital subscriber line"(DSL) broadband technology that is used to connect to the Internet. It uses standard telephone lines to deliver high-speed data communications. It can deliver high speed internet up to 24 megabytes per second.

 ADSL was specifically designed to exploit the one-way nature of most multimedia communication in which large amounts of information flow toward the user and only a small amount of interactive control information is returned. Several experiments with ADSL to real users began in 1996. In 1998, wide-scale installations began in several parts of the U.S. In 2000 and beyond, ADSL and other forms of DSL are expected to become generally available in urban areas. With ADSL (and other forms of DSL), telephone companies are competing with cable companies and their cable modem services.

ADSL


 

HOW DOES ADSL MODEM WORKS?

It is a type of modem that modulates a baseband signal over the subscriber loop between the aubacriber’s premiaea and the central office. Baseband means the full range of frequencies that can be carried by the copper pair of the loop, and is a much larger band (megahertz) than the narrow bandwidth of voice channels available from end to end in a normal telephone call. By modulating a signal of this bandwidth over the loop, and than translating the data to digital at the CO and transmitting it by other means over the Internet, much high data rates can be obtained than with older modems that modulate an end-to-end voice-frequency carrier of a few kilohertz.


The key here is that ADSL provides a high-speed link over the local loop that takes advantage of the high capacity of that local loop, then hands over the communication to digital equipment that doesn't use the rest of the POTS directly. An older modem tries to modulate from end to end and is thus restricted to the modest speeds available over a PTOS voice channel. 


ADSL FUNCTIONS

 

Advantages of ADSL? 

1. Provides the ability to talk on the phone while surfing through the Internet, because, as noted above, voice and data work in separate bands, which implies a separate channel.

2. * Use existing infrastructure (the basic telephone network). This is advantageous both for the operators who do not face large costs for the implementation of this technology to users, since the cost and time it takes to keep available the service is less than if the operator had to undertaking works to build new infrastructure.

3. * ADSL users have access to the Internet, not having to establish this connection by dialing or signaling to the network.

 4. This is possible because they have point to point, so that the line between the PBX and the user is not shared, which also ensures dedicated bandwidth to each user, and increases the quality of service. comparative ADSL . This compares with a switched network architecture.

5. * Provides connection speeds much higher than the one made by dial-up Internet. This is the most interesting to users.

ADVANTAGES

Disadvantages of ADSL?

1. * A DSL connection works better the closer you are to the telephone exchange in your location.

2. * The connection is faster to download (receive data) to send information.

 3. * This service is not available in all locations.


DISADVANTAGES!

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