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This paper gives a general description of the 5ESS™ switch hardware design. A significant amount of new hardware, including numerous very‐large‐scale integration circuits, microprocessors, signal processors, and memory devices, is used in the 5ESS switch design to accomplish its operational and maintenance design objectives. By adhering to the distributed and modular architecture in all the hardware designs, the incorporation of advancing technologies and new functionality is accomplished with ease.

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