How does xDSL work?
xDSL utilizes more of the bandwidth on copper phone lines than what is currently used for plain old telephone service (POTS). By utilizing frequencies above the telephone bandwidth (300Hz to 3,200Hz), xDSL can encode more data to achieve higher data rates than would otherwise be possible in the restricted frequency range of a POTS network. In order to utilize the frequencies above the voice audio spectrum, xDSL equipment must be installed on both ends and the copper wire in between must be able to sustain the higher frequencies for the entire route.
xDSL utilizes more of the bandwidth on copper phone lines than what is currently used for plain old telephone service (POTS). By utilizing frequencies that are above the telephone bandwidth (300Hz ~ 3,400Hz), xDSL can encode more data to achieve higher data rates than it would otherwise be possible in the restricted frequency range of a POTS network. In order to utilize the frequencies above the voice audio spectrum, xDSL equipment must be installed on both ends and the copper wire in between must be able to sustain the higher frequencies for the entire route. This means that bandwidth limiting devices such as loading coils or Bridge tap must be removed or avoided.
xDSL modems use digital coding techniques to squeeze up to 99% more capacity out of a phone line without interfering with your regular phone services. That means you could be simultaneously talking on the phone or sending a fax – while surfing the World Wide Web, since the DSL service operates off another separate phone circuit and does NOT need to tie-up your current voice and/or fax line.
xDSL modems use digital coding techniques to squeeze up to 99% more capacity out of a phone line without interfering with your regular phone services. That means you could be simultaneously talking on the phone or sending a fax – while surfing the World Wide Web, since the DSL service operates off another separate phone circuit and does NOT need to tie-up your current voice and/or fax line. Will DSL interrupt existing phone service? No. DSL works on its own phone line. An end user will never experience slower performance when making phone calls. What is the controversy between CAP and DMT line codes? CAP and DMT are two “line codes” or modulation systems currently on the market today for xDSL. The Forum has taken no position on the merits or demerits of either. Each line code has its own case to make. All major xDSL vendors belong to the ADSL Forum and set aside their differences while working together to create system guidelines and market positions. As such, it can be fairly represen
