The FT-1HD2A2C2G/2A2C2G-12 fiber optic transmission system that takes advantage of Meridian’s new digital encoding technology transmits following signals over one single mode fiber : One real-time, SDI / HD-SDI Video (19 Mbps to 1.5Gbps), Two full duplex 24 bit audio, One user selectable, full duplex RS-232, RS-485 (2 or 4 wire), RS-422, Manchester, Bi-Phase or in combination. In addition, following signals are optionable and interchangable: One user selectable, full duplex RS-232, RS-485 (2 or 4 wire), RS-422, Manchester, Bi-Phase or in combination, Two full duplex contact closure channels. These units featuring built-in Re-clockers that support 3R (Retiming, Reshaping, Regenerate) functions and buffered output. The functionality of this system is enhanced by compatibility with Meridian’s PC based SpectraSmart™, Network Management and Remote Diagnostic Software System. SpectraSmart™ supervises the operating parameters of the transmission system such as status on SDI signal presence, PLL lock, SDI data rates, voltage, temperature, optical levels.