Patent ID: 6381269
Filing Date: 2002-04-30
Classification: H04B

Abstract:
A test system for characterizing interference tolerance in a digital signal link, comprising:a digital data signal generator; a digital data signal receiver; a digital signal link connected between said data signal generator and said data signal receiver and carrying digital data signals generated by said data signal generator to said data signal receiver; a test interference signal injection (TISI) network disposed in said digital signal link; a data signal input to said TISI network for receiving said digital data signals from said digital signal link; a data signal output from said TISI network for returning said digital data signals to said digital signal link; an interference signal input to said TISI network for receiving interference signals from an interference signal generator; and directional coupling means in said TISI network for directionally coupling said interference signals into said digital signal link at an impedance that substantially matches the impedance of said digital signal link, said directional coupling means being configured to maintain d.c. isolation from ground to facilitate the transfer of d.c. coupled logic in said digital data signals through said TISI network.