Electronic equipment, namely, transformers, baluns, communication hubs, audio-video networked hubs and extenders, computer network hubs and digital media hubs, video multi-viewers, test equipment, electronic and optical communications instruments and components, namely, communication link testers for testing communication links, rackmount display monitors, analog and digital repeaters used in extended distance for audio-video applications, cables used in connection with computers, computers peripheral devices, televisions, audio-video equipment, audio and video transmitter and receiver units, closed-circuit TV equipment closed circuit TV systems for security and surveillance, namely, signal extenders for cameras, switchers, monitors, microphones, and recorders, and telecommunications equipment, namely, fiber-optic transceivers, fiber optic repeaters, converters and optimizers, switches including Ethernet switches and routers, and terminators and repeaters, multiplexers and coaxial converters for communications between computers, computer peripherals for ensuring privacy of communications via telephone lines and other communication links, computer modems, transceivers for communications between computers and for communication via twisted pair cable and fiber optics