Patent ID: 6366562
Filing Date: 2002-04-02
Classification: H04L

Abstract:
A monitor interposed between first and second digital equipment that communicate with each other by digital signals in accordance with a first protocol, said first and second equipment having respective first and second connectors and conductors for carrying respective digital signals, said monitor having a ground connection that is magnetically isolated from a ground connection of an instrumentation system, said monitor comprising:(a) a directional coupler having an output and an input connected to said first and second connector, said directional coupler directing and allowing the digital signals of said first digital equipment to pass to its said output and, conversely, inhibiting the digital signals of said second digital equipment from passing to its said output; and (b) an isolation coupling transformer having an input stage to receive the digital signals at said output of said directional coupler and an output stage connected to the instrumentation system.