ADSL is an acronym for Asymmetric Digital Subscriber Line. It is a form of DSL which is a data communication technology introduced to provide faster data transfer rate over the traditional telephone lines. Traditional modem can exploit the capacity of the copper telephone lines. For this purpose, DSL was introduced that uses the same copper telephone lines but provides much faster data transfer rate that can be provided by a 52 K modem.

How ADSL provides greater speed over the same Telephone Lines:

A common question that comes in an ADSL user mind is that how come the ADSL provides increased data transfer rates over the same copper telephone lines. Many people are not aware that the telephone they use for voice calls doesn’t utilize the frequencies provided by the telephone lines. A small portion of frequencies is used for voice communication while the rest of the potential frequencies of the telephone line remain unused. ADSL providers install a special device called as splitter or a micro filter that divides the telephone line so that separate frequencies can be used for telephone calls and for data transfer; hence telephone calls and internet can be used at the same time unlike previous dial-up connections. At the tele-exchange, these telephone lines terminates at a special device called as a DSLAM which separates the voice signals from the data signals.

How ADSL is different from other DSL forms:

The major difference between ADSL and other members of the DSL family like HDSL etc is the frequency division for the upload stream and the download stream. ADSL offers greater data transfer rates in the download direction as compared to the upward direction; that is why it is called as asymmetric. ADSL is more convenient and desirable for home users as they usually download more data than they upload using the internet.

Installation of ADSL:

Installation of ADSL is fairly simple and has different ways. Because ADSL uses different frequency spectrum, that is why its deployment presents some technical issues and it requires a special device or filter to be installed at the subscriber’s premises so that there is no interference of voice signal and the data signal. Previously, the only way of ADSL installation was to book an appointment with a technician that would come to visit the premises of the customer. After that, the technician would install the splitter or the micro-filter near any demarcation point. The minus of this approach was that the customers had to wait longer to get an appointment with a technician. As a solution, many DSL vendors have now started offering self-installation options. In this case, the equipment comes with a detailed manual that contains the instruction for installing the device.

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