The Comnet FVT/FVR41 multiplexer simultaneously transmits four channels of video over one optical fiber utilizing state-of-the-art digital encoding and decoding for high-quality video transmission. These environmentally hardened units are ideal for use in unconditioned roadside or out-of-plant installations. They are completely transparent to and universally compatible with any NTSC, PAL, or SECAM CCTV camera systems.