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Dr. WALTER Y. CHEN, Senior Scientist for MAXIM Integrated Products, is a leading expert on broadband communications and high-speed copper digital transmission systems. He has led key R&D efforts at AT&T Bell Labs, NYNEX, Bellcore, and Texas Instruments; at Motorola, he was extensively involved with in-house telephone and electrical wiring and RF home networking projects. Chen holds 15 U.S. patents, and is the author of DSL: Simulation Techniques and Standards Development for Digital Subscriber Lines.