The present invention is a novel apparatus for amplifying upstream and downstream signals, the signals comprising different portions of a communications spectrum and wherein at least two portions require amplification in opposing upstream and downstream directions. The apparatus comprises: an upstream port wherein upstream signals are input into the apparatus; a downstream port wherein downstream signals are input into the apparatus; a first stage connected to the upstream and the downstream ports, the first stage filtering out a first portion of the spectrum and passing the first portion between the upstream and downstream ports, the first stage comprising a first pair of first stage filters for filtering the first portion from the upstream and the downstream signals and a second pair of first stage filters for passing the remaining spectrum; a second stage connected to the second pair of first stage filters, the second stage filtering out a second and a third portion from the remaining spectrum; the second stage comprising a first pair of second stage filters for filtering the second portion and a second pair of second stage filters for filtering the third portion; wherein the first stage and the second stage are substantially electrically isolated.
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