Electronic and optical communications instruments and components, namely, communication link testers for testing communication links; Fiber optic instruments, namely, Fiber optic optical time domain reflectometers, measuring or testing machines and instruments; Fiber optics; Optical fiber connectors; Resistance measuring instruments; Surveying instruments; Telecommunications equipment, namely, fiber-optic transceivers, fiber optic repeaters, converters and optimizers, wave division multiplexe...