Here is a short introduction to the technology

ADSL technology stands for Asymmetric Digital Line. It supplies to download and upload much more large files in minutes. ADSL uses the high-frequency capacity of copper lines to carry a high bandwidth signal to and from your local exchange.

The service is digital based and operates over the same pair of copper wires as your ordinary phone line, thus you do not need an extra line for the ADSL service but you do need a standard (PSTN) phone line.

To separate the voice and data signals there is a 'splitter' (which is a filter). It separates telephony signal from the ADSL signal. This means that telephone calls can be made at the same time that data is being sent or received (i.e. a customer can surf the internet and still make telephone calls). So you can enjoy simultaneous Internet and phone access. For most companies, utilizing their fax line is normal and they can still send the faxes.

Unlike dial-up service, ADSL is always on service, part of the product is to provide each user with a connection port, whether they are transferring data or not. So the service supplies a full-time connectivity - 24 hours a day.