The American Fibertek 86 Series transmits and receives standard telephone signals on one multimode optical fiber using AM/FSK transmission. This system is designed to be completely transparent to all telephony signals includingring, off-hook, hook-switch flash and forward disconnect. Products require no field adjustments at installation or additional maintenance thereafter. Diagnostic Indicators provide a quick visual indication of system status. The 86 Series are ordered as stand alone modules or rack cards that are mounted in the American Fibertek Card Cages: SR-20D/2, or SR-20R/1.