How does DSL Work

Originally, the telephones were made to allow the exchange of voice information with other phone users, using an analog signal. The same technique is followed to transfer data using a modem. A modem is used to transfer digital information by demodulating the analog signal. For high speed Internet connections, a DSL or a modem can be used.

How does DSL Work

DSL technology allows the digital data to be transmitted directly to your computer as digital data. However if one wants, the signal can be split to allow some of the bandwidth, to transmit analog data along with digital data, so that one can use the telephone and computer at the same time and also use the same line. This modern technology allows both analog and digital signals to be transmitted, making maximum use of the telephone lines' capacity.

Most users are connected to an asymmetric DSL (ADSL) line. This line divides the available frequencies, because of which users can download or upload unlimited information. ADSL uses two equipments; one at the Internet service provider, DSL service provider or telephone company's end and the other at the customer's end. The user has a DSL transceiver at his location and the DSL service provider has a DSL Access Multiplexer (DSLAM) at his end to receive user connections.

The Transceiver, also known as the DSL modem or an ATU-R, is the point, where data from a user's computer or network is connected to the DSL line. The DSLAM gathers all the connections from different users and fuses them into a single, high-speed connection to the Internet. DSLAM supports different protocols and modulations in the same type of DSL.

DSL speed is described in terms of bandwidth rating, which has a range from 1.5 Mbps to 3 Mbps. The number 1.5 Mbps refers to the maximum bandwidth available for downloads, whereas the second number, 3 Mbps refers to the bandwidth available for uploading.

Advantages of DSL

• DSL is cost effective, as it requires no new phone lines.
• DSL speed is higher than a regular modem.
• It is easy to operate and install.
• It is emerging as a standard for high-speed connectivity.
• The Internet and the telephone can be used simultaneously.
• Computers connected using DSL are less susceptible to theft or data destruction.
• Different DSL providers have many different packages one can choose from.

Disadvantages of DSL

• DSL service availability is determined by the distance between the user and provider's central office.
• Currently, there is no standardization of the DSL modem, which means that the users may need new equipment to stay connected.
• The service is easily available in the urban areas, but not in the rural areas.
• Receiving data (downloading) is faster than sending data (uploading).
• It is incompatible with fiber optic lines.

DSL uses the existing telecommunication system to provide the users with better and high-speed connectivity. A better service in this day and age that supports audio, video and multimedia data will definitely help the growth of business and provide the domestic users with global connectivity.