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A digital signal processing device used to connect an external digital channel (such as a T-1, DDS, or Switched 56 line) to a multiplexer or to another device that produces a digital signal (such as a digital PBX or a PC).At the customer's end of the telephone connection, CSUs perform much the same function for digital circuits that modems provide for analog connections. A CSU performs certain line-coding, line-conditioning, equalization, and monitoring functions, including transmit and receive filtering, signal shaping, longitudinal balance, voltage isolation, and remote loopback testing for digital transmission.

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