RR-89D SKU RR-89D-122 Intercom System for Dukane Starcall Rack Cd Rx 850/1300nm 12dB MM - 1 Fiber Please log in to see price or purchase this item Request an account Line Comment Special Price Features:Bi-directional Audio and Contact Closure TransceiversDiagnostics: Power and Optical PresenceVoice Operated (VOX) TransmissionFM Modulated Audio