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The American Fibertek 89A-L Series transmits one channel of high-quality low distortion bi-directional audio/contact closure on one multimode optical fiber. Designed to be completely transparent, the system's field microphone and audio level can be adjusted to balance and optimize signal levels. Diagnostic indicators provide a quick visual indication of system status. Equipment may be ordered as stand alone modules or rack cards that are mounted in the American Fibertek Card Cages: SR-20D/2 or SR-20R/1.