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Definition of CSU/DSU's 

This device provides isolation between the phone companys digital network and the customers premise equipment. The DSU provides a standard digital interface for the customers premise equipment and provides framing format requirements. The CSU also provides termination to the central telephone office, line conditioning, equalization and diagnostic capabilities. When connecting equipment like a Router or Multiplexer to a Telephone companies circuit, you must provide a CSU/DSU between your equipment and their circuit.

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