Modem Support

Line filter and DSL spliter

Splitters and filters cause the most avoidable installation problems for ADSL users. A filter or splitter is essential wherever a telephone or other device shares a line with an ADSL modem. Filters and splitters eliminate the high frequency noise used by ADSL services from being heard on the phones. Splitters and filters perform the same function but in two ways. A splitter divides the signal into two parts one part containing the ADSL signal and the other containing only voice. Filters block the ADSL signal and allow the voice to go through.

Filters typically have 2 labels: Phone and Line. To use a filter connect your telephone devices to the phone side of the filter and plug the filter into the wall socket. Never filter the signal going into your ADSL modem as this will result in a slow, unreliable connection. Never install a filter backwards as the results are unpredictable.

If you need to plug your ADSL modem into the same wall socket as a telephone, use a telephone double adapter: plug the telephone double adaptor into the wall socket plug the ADSL modem into the double adaptor plug the filter in to the double adaptor and, connect the telephone devices to the filter

Just because it fits together doesn`t make it right! It is very important to read and identify the labels on splitters and filters, because the plugs and sockets can be connected in many different combinations only one of which actually works.

If your phone lines look like a rats nest of extension cords, it can help to clean them up before trying to put the filters or splitters in place. Although it often works, it is not recommended to install your ADSL modem on a telephone extension cord

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