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DSL is a technology that allows digital data and voice transmission over telephone lines. ADSL is the most common type used for high-speed internet access. DSL requires filters to separate data and voice flows, and is sensitive to distance from hubs.
A digital subscription line (DSL) is a technology that allows people to transmit digital data along with voice over a telephone line. There are a number of different technologies under the DSL service umbrella, the most common being an asymmetric digital subscriber line (ADSL). In fact, many people use the term “DSL” when they actually refer to ADSL, illustrating how widespread this particular form of technology is. Many people around the world use this technology to access the Internet, both at home and in the office.
This technology allows people to access high-speed internet using existing cabling. Competitors such as cable and satellite Internet services may require additional cabling, depending on whether or not a facility has been equipped with the necessary cabling. It is also important to note that digital subscriber line services are not available in all areas because the technology is sensitive to distance; people too far from a hub will get a signal that’s too weak to use. Many companies that provide this service are increasing the number of hubs to increase broadband penetration and attract more customers.
Telephone lines are capable of carrying much more data than just voice. A relatively small low frequency range is reserved for voice transmissions, making room for other data in the line. A digital subscriber line uses high-frequency areas to send and receive data, dividing a telephone line into a stream for voice, a stream for download, and a stream for upload.
With ADSL, more bandwidth is reserved for download, which is why people may have noticed that it tends to take less time to download data than it does to upload it. Symmetrical digital subscriber line technology, on the other hand, reserves equal amounts of bandwidth for both uploads and downloads. Most people find ADSL perfectly suited to their needs.
To transmit both voice and digital data, a digital subscriber line needs a filter. Filters are installed on the telephone line to divide the data flows; people can connect a DSL modem to the digital data side of the splitter and a phone line to the voice data side. Modems can also be used for home networking and can be wireless to allow people access to the internet without needing to be connected directly to the modem. However, transmission speeds may be faster when connected directly to the modem.
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