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This paper describes the utility of the Java-DSP (J-DSP) technology and the associated on-line laboratories in linear systems courses. J-DSP originally was developed for use in a DSP undergraduate course. Recently the functionality of J-DSP has been extended to support communications, image processing and controls courses. In addition, several new functions have been developed to support advanced DSP applications, such as, speech coding, voice recognition, and spectral estimation. Some of these extensions have also been used to demonstrate the use of DSP in emerging research areas such as Genomics. The first part of the paper discusses these functionality extensions and planned functionality and the second part focuses on the on-line J-DSP laboratories and assessment of J-DSP labs.