Four DSL filters by Pace Electronics. Three filters are single line filters, one end is female line in from modular analog telephone line (RJ-11), the other end is line out female RJ-11 standard modular analog telephone line that carries both telephone signal and DSL signal. A DSL filter also is called a DSL splitter or microfilter. It is an analog low-pass filter installed between analog devices (such as telephones or analog internet modems) and a plain old telephone service (POTS) line (RJ-11 modular telephone plug). The DSL filter prevents interference between such devices and a digital subscriber line (DSL) service connected to the same line. Without DSL filters, signals or echoes from analog devices at the top of their frequency range can reduce performance and create connection problems with DSL service, while those from the DSL service at the bottom of its range can cause line noise and other problems for analog devices. These are PACE brand 2-WIRE DSL FILTER BLOCKERS Z-BLOCKER LINE CONDITIONERS BRAND NEW. Three of the filters are single one way filters. One of the filters is two way at the output, thereby an analog internet modem can be plugged into one output and an analog telephone can be plugged into the other output. Atotal of four pieces are for sale in one listing for one price. ALL NEW still sealed in plastic bags from Pace Electronics, a leader in analog internet wiring devices.

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