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DSU/CSU (Data Service Unit/Channel Service Unit)

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A DSU (data service unit) is a communication device that connects a company's telephone premises equipment to digital communication lines, such as a T1. A CSU (channel service unit) provides line termination and signal regeneration. The DSU and the CSU are often combined in one device and connected to a channel bank, which provides analog-to-digital conversion and multiplexing of voice transmissions. See "CSU/DSU (Channel Service Unit/Data Service Unit)."

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