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ADSL / DSL broadband enables your computer modem to share a voice telephone line, by transmitting data at high frequencies outside of the range of human hearing, thus enabling both computer and voice services to be used at the same time. Without any equipment installed between your broadband modem and telephone, the interference from the modem makes the telephone unusable as you can hear the high pitched squeal in the background. You also have to bear in mind, that unlike a standard 56K dial-up modem, a broadband modem connects to the internet as soon as you switch on your computer - as a result, the interference is noticeable as soon as you switch on the PC, even if you have not connected to your ISP (Internet Service Provider).
An ADSL Filter is thus required whenever you connect a computer to the internet using Broadband over a standard telephone line (non-cable). The filters divide the signals on the telephone line between the high pitched computer modem sounds and the lower pitched human voices.