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CSU/DSU (Channel Service Unit/Data Service Unit)
Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
Because digital signaling on the telephone network is different than the digital signaling used by computer equipment, special devices are required to connect the two types of transmission facilities together. The CSU/DSU is part of the hardware you need to connect digital computer equipment to telephone company digital transmission lines (T1 and T3 lines).
CSUs (channel service units) and DSUs (data service units) are actually two separate devices, as described next, but they are used in conjunction and often combined into the same box.
This topic continues in "The Encyclopedia of Networking and Telecommunications."
Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.