What is ADSL?


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Asymmetric Digital Subscriber Line is ranked among high-speed data transmission technologies known as DSL tools and had generic term xDSL. ADSL has been designed for ensuring high-speed megabit access to interactive video services (such as video-on-demand, videogames) and fast data transmission (as internet accessing, remote access to LAN and other nets).

What is an ADSL technology?

First of all, it’s a technology transformed twisted-pair phone wires in high-speed data communication path. ADSL line combines two modems which are connected to each twisted-pair of phone cable ends and organized 3 informational channels: downward and upward data transfer flow and Plain Old Telephone Service (POTS) which is assigned with filters guaranteeing telephone performance even in an ADSL connection fault.

Graphic example of ADSL technology:

ADSL technology

Seeing that ADSL is an asymmetric technology where downward data flow (info passed over end customer side) is higher than upward flow performance (info transmitted from customer to the net).

ADSL technology operates with digital signal processing (DSP), specially designed algorithms, updated analog filters and analog-to-digital converters in order to reduce large quantities of transporting data. Long distance phone lines can defuse streamed high-frequency signal that motives ADSL analogue systems manipulate with severe load provided high dynamic range and low noise level.

Technology separates transmission phone line band in few frequency or carrier bands that simultaneously transmits several signals over a line. Using ADSL, different carrier bands transport distinct data packets and form Frequency Division Multiplexing. FDM dedicates one diapason for downward data flow, and another to upward flow which for their part are divided to several transfer channels. 

In such a manner ADSL guarantees simultaneous broadband data transfer, video and fax transmission without standard phone line interruption.

One of the main advantages of ADSL technology lies in its usage of generic twisted-pair copper wires of telephone cables and renouncing of expensive and time-consuming cross-connect equipment modernization.

ADSL and the Internet

There is no need dialing a number in order to connect the Internet. ADSL builds wide-band data link using active telephone line and grants persistent available connection.

By contrast with cable modems which allow dividing pass band between all users, ADSL technology provides individual ownership of line frequency pass band that considerably impacts to transmission speed.

Through the use of ADSL technology, telecommunication companies provide private secure channel allowing info exchange between a customer and a provider.

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