DATA COMMUNICATIONS EQUIPMENT, NAMELY, MULTIPLEXORS, MODEMS, CONVERTERS, AND LOCAL NETWORK DEVICES , NAMELY, HUBS, ROUTERS, SWITCHES, REPEATERS, NETWORK INTERFACE CARDS, BRIDGES, TRANSCEIVERS AND TERMINAL SERVERS; TESTING EQUIPMENT FOR DATA COMMUNICATIONS PRODUCTS, NAMELY, LINE SIMULATORS, CABLE TESTERS AND MULTIPLEXOR TESTERS