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Porta Systems Corporation

Porta Systems Corporation Patent applications
Patent application numberTitlePublished
20100073483System and method for transmitting video from multiple video cameras over a single multiple pair, twisted pair cable - A system for transmitting video signals from multiple video cameras over one or more multiple pair, twisted pair cables includes several video cameras and a plurality of twisted pair-to-coax balun “T” devices connected to the video cameras by coaxial cables. The video cameras generate unbalanced video signals. The twisted pair-to-coax balun “T” devices are connected together in a “daisy chain” fashion by electrical cables having multiple twisted pairs of wires. The balun “T” devices convert the unbalanced video signals from the cameras to balanced video signals. The balanced video signals are transmitted over the multiple pair, twisted pair cables to a hub, which provides the video signals to one or more monitors, a DVR, a multiplexer or other device.03-25-2010
20080265917Return loss bridge circuit - A return loss bridge circuit for testing a balanced test impedance includes an input connector and a reflection connector. The input connector and the reflection connector are electrically connected to an output of a network analyzer and an input of the network analyzer, respectively. The return loss bridge circuit further includes a reference impedance connected between the input and reflection connectors, first and second transformers and a common mode choke. The common mode choke is electrically connectable to the balanced test impedance.10-30-2008

Patent applications by Porta Systems Corporation