Channel Service Unit

Channel Service Unit
   Abbreviated CSU. A device that functions as a certified safe electrical circuit, acting as a buffer between the customer's equipment and a public carrier's WAN.
   A CSU prevents faulty CPE (customer-premises equipment), such as DSUs (data service units), from affecting a public carrier's transmission systems and ensures that all signals placed on the line are appropriately timed and formed. All CSU designs must be approved and certified by the FCC.
   See also Data Service Unit.

Dictionary of networking . 2014.

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