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Agilent PN 89440A-4 Characterization of Digital Communications Channels with the Agilent 89410A and 89440A Product Note Accurate measurements of channel Introduction While simulations may provide some imperfections are important to the Digital communication schemes are valuable information, they can be designers and operators of digital rapidly replacing older analog costly and may not accurately repre- communication systems. These meas- schemes in many applications. The sent the real system. For example, it urements are especially critical desire for greater information density is not practical to construct a simu- because of our desire for greater has increased the importance of lated CATV network that exhibits the information density. Conventional understanding the imperfections of myriad of micro-reflections that network analyzers cannot measure the communication channel. Devia- plague real systems. systems that span several miles. tions from constant amplitude or lin- The Agilent Technologies 89410A ear phase limit the complexity of the Advent of time-selective vector (dc