This means a separate, physical line without dial-tone for DSL and Internet connectivity. On your end, this simply means using one of the unused wire pairs in the telco wire bundle, and connecting it to the DSL jack. Shared Line with Splitter . Installing a splitter splits the line into two pairs, and filters the DSL signal from one of them. This results in a inside wiring scheme where DSL goes to only one jack, and then POTS service to all other jacks.
Splitters are available from various manufacturers and come in various shapes and sizes.
Typically this is mounted near the NID, on the customer's side of the demarcation point. Shared Line with Filters . Again, for DSLs that piggyback on the POTS line, the signal must be filtered or split at some point. This is obviously much easier since no tools or wiring is required. Shared Line, Splitterless and Filterless .