The FIM-S222 optical fiber interface allows one or two digital matrix intercom user panels, interface modules or 4-wire sources to be remotely connected to Eclipse, Eclipse HX and Matrix +3 intercom systems over optical fiber. A pair of FIM-S222 interfaces is required for each fiber link; one at the matrix frame and the other at the matrix user panel. See FIM-4W2 as a replacement for the FIM-S222.