The series 170 is a frequency modulated (FM) state-of-the-art fiber optic system that transmits a real time video signal plus two high fidelity audio or data or one audio and data signal over one multimode or singlemode fiber. PAL, SECAM or NTSC formats, in B&W or color, are seamlessly transmitted distances of up to 6Km (multimode) and 100Km (singlemode). Available formats are balanced/unbalanced audio, GenLock, Manchester, Biphase, RS-232D, RS-422A, 4-20mA current loop, TTL, and contact closure. The capabilities of the Model 170 are enhanced by it’s compatibility with Meridian’s PC based SpectraSmart network management and diagnostic software system. SpectraSmart supervises the operating parameters of the transmission system such as status on video levels, sync, FM carrier detect, voltage, temperature, optical levels, etc, and external equipment which are attached to the Meridian equipment.