The single-mode fiber-optic receiver module system incorporates digital encoding technology. This fiber-optic module transmits 4 channels of multiplexed NTSC/PAL video (10 bit, 7MHz) over one fiber. This is single-mode fiber system. The versatility of the FT/FR-4W-9 system is improved by SpectraView, an on-screen-video-diagnostic/setup firmware system and SpectraSmart, an optional PC based network-diagnostic system. SpectraView monitors the integrity of the fiber link. A break in the fiber path will cause a loss of fiber alarm to be displayed on an associated monitor. SpectraView is easy to use, always active and eliminates the need for additional test equipment. SpectraView includes a selectable on-board audio and data test signal generator with built-in local and remote loop-back functions. The FT/FR-4W-9 system product is fully compatible with Meridians PC based SpectraSmart network management and diagnostic software system. SpectraSmart supervises the operating parameters of the transmission system such as the status on video levels, sync, digital carrier detect, voltages, temperature and optical levels.