DSL filter
Encyclopedia : D : DS : DSL : DSL filter
A DSL filter is an analog low-pass filter installed on telephones and other analog devices to prevent interference between such devices and Digital Subscriber Line (DSL) service operating on the same line. Without the installation of DSL filters, low-frequency signals from analog devices can result in reduced performance and connection problems with DSL service, and the high-frequency signals from the DSL service can result in line noise and other issues for analog devices.
Typical installation for an existing home involves installing DSL filters on every telephone and fax machine in the home, leaving the DSL modem as the only unfiltered device. In cases where it is possible to run new cables, it can be advantageous to split the telephone line after it enters the home, installing a single DSL filter on one leg and running it to every jack in the home where an analog device will be in use, and dedicating the other (unfiltered) leg to the DSL modem. Some devices, such as home security systems and Telephone Devices for the Deaf, cannot operate through DSL filters and must be installed on their own line.
Protocols & Specifications
- ITU G.992.1 (G.DMT),
- ITU G.992.2 (G.Lite)
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