The American Fibertek MT-0880 is a module transmitter component of the 0880 series which transmits two channels of high-quality bidirectional audio on one multimode optical fiber. Designed to be completely transparent, this product can be used in intercom Tie-lin applications between exchanges. This system requires no field adjustments at installation or additional maintenance thereafter. Diagnostic indicators provide a quick visual indication of system status. Equipment may be ordered as stand alonemodules or rack cards that are mounted in the American Fibertek Card Cages: SR-20D/2 or SR-20R/1.