Editing Data service unit (section)

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A '''data service unit''' ('''DSU'''), sometimes called a digital service unit, is a piece of [[telecommunications]] circuit terminating equipment that transforms digital data between telephone company lines and local equipment. The device converts [[bipolar signal|bipolar digital signals]] coming ultimately from a digital circuit and directly from a [[Channel service unit]] (CSU), into a format (e.g. RS- 530) compatible with the piece of [[data terminal equipment]] (DTE) (e.g. a router) to which the data is sent. The DSU also performs a similar process in reverse for data heading from the DTE toward the circuit. The telecommunications service a DSU supports can be a point-to-point or multipoint operation in a [[digital data]] network.