The present arrangement replaces passive components of a multi-mode fiber optic channel, such as a typical prior art cassette (i.e. connectors & short lengths of fibers) with active cassettes that have components therein that receive the optical signal from a first transmitting transceiver, convert the signal to an electrical signal, route that signal appropriately within the cassette and re-send an optical signal out from the opposite of the cassette into the infrastructure harness. This results in a localized optical signal boost at a mid-channel location.