QAM Overview and Troubleshooting Basics for Recently Digital Cable Operators

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Executive Summary

Digital Quadrature Amplitude Modulation (QAM) signals are a complex challenge for the average cable technician. This paper will examine QAM and will cover the basics for understanding QAM technology) they will also discuss the kinds of failures that cause digital problems and explain what to look for when testing. Then they will look at the tools that are used to frond these faults. In a traditional voice modern, tones are used to represent ones and zeros. Low tones represent zeroes and high tones represent ones. In QAM, instead of tones, ones and zeroes are represented as the sum of two signals that are in- and out-of-phase with a clock. The two signals are called I (for in-phase) and Q (for quadrature).

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