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some filters have dual outlets on back, 1 for unfiltered to dsl, 1 for filtered phone.
Haven't seen those. At my surge protector, I have a 3 way splitter. One for my dial up modem with a filter, one to my phone/fax with a filter, and one to the DSL modem. A simple single splitter/filter wouldn't do me any good.
On my filters there are two outputs. DSL and Phone.