Electronic and optical communications instruments and components, namely, digital transmitters, optical data links, optical receivers, optical transceivers, and optical transmitters; electronic transmitters and receivers for communication; metal cabinets specially adapted to protect telecommunications equipment in the nature of fiber optic cables; telecommunications equipment, namely, fiber-optic transceivers, fiber optic repeaters, converters and optimizers, wave division multiplexers, freespace optics transmission systems, switches consisting of Ethernet switches and routers, fiber-to-the-home and Ethernet-over-VDSL access aggregators, terminators and repeaters, and remote presence management products, namely, switches, and console, alarm, sensor and power management devices; telecommunications equipment, systems and accessories, namely, digital transmitters, analog transmitters, digital receivers, analog receivers, fiber optic Ethernet modems, rack cases, chassis, outdoor environmental enclosures, DC power supplies, AC power supplies, network monitoring modules, software for monitoring and controlling communications systems, RF splitter/combiner modules, and RF electromechanical modules