DSL filter

DSL filters are passive devices, requiring no power source to operate.

The user typically installs a DSL filter on each phone.

In order to use Broadband internet services simultaneously with voice telephony, it is necessary to use a DSL filter.

At both ends, a device called Splitter (or DSL filter) separates the data part and the telephony part.

Because a single phone line commonly carries DSL and voice, DSL filters are used to separate the two uses.

Some of these devices can be successfully filtered with a DSL filter or splitter, especially if the hardwired connection is converted into a jacked connection.

A splitter, or DSL filter, allows a single telephone connection to be used for both ADSL service and voice calls at the same time.

On the customer premises, a DSL filter on each non-DSL outlet blocks any high frequency interference, to enable simultaneous use of the voice and DSL services.

Some devices, such as monitored alarms and Telephone Devices for the Deaf, mainly certain older models using an acoustic coupler, may be hardwired and may not easily accept a DSL filter.

The DSL modem connects directly to the phone line (most DSL filters have a socket marked DSL that just connects directly through to the incoming phone line).

On the subscriber's end of the circuit, inline low-pass DSL filters (splitters) are installed on each telephone to filter the high-frequency "hiss" that would otherwise be heard, but pass voice (5 kHz and below) frequencies.

As such, a frequency splitter, or DSL filter, cannot be used to allow a telephone line to be shared by both an SHDSL service and a POTS service at the same time.