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DATA COMMUNICATIONS EQUIPMENT, NAMELY, MULTIPLEXERS CAPABLE OF; MULTIPLEXING AND SWITCHING A RANGE OF VOICE, DATA AND IMAGE DIGITAL INFORMATION FROM ONE NETWORK NODE TO ANOTHER IN A WIDE AREA COMMUNICATIONS NETWORK, CONTROLLING, MONITORING FOR FAULT AND DIAGNOSING NETWORK NODES LOCATED AT ANY POINT IN A COMMUNICATIONS NETWORK, AND, USING BOTH PRIVATE PROTOCOLS AND ESTABLISHED STANDARDS TO COMMUNICATE WITH OTHER NODES IN A COMMUNICATIONS NETWORK