Automatic switching devices; Electrical components, namely, electrical contactors; Electrical components, namely, protective relays; Electrical transformers; Electronic and optical communication instruments and components, namely, cable television transmitters; Electronic and optical communication instruments and components, namely, communication link testers; Electronic and optical communication instruments and components, namely, digital transmitters; Electronic and optical communication instruments and components including optical data links; Electronic and optical communication instruments and components including optical receivers; Electronic and optical communication instruments and components including optical transceivers; Electronic and optical communication instruments and components including optical transmitters; Electronic components for computers; Electronic test and measurement equipment used in the fields of networking and telecommunications, namely, instruments used to test and certify voice and data communication cables and coaxial cables; Integrated circuit cards and components; Signal band splitters used in telecommunications applications; Telecommunications cables; Telecommunications switches; Telecommunications cables; Telecommunications transmitters; Microwave connectors; Microwave filters; Microwave communication devices; Duplexers; Triplexers; Multiplexers; Band-pass filters; High-pass filters; Low-pass filters; Cavity filters; Power splitters; Radio-frequency circulators; Radio-frequency isolators; DC blocks; Hybrid combiners; Waveguides