Data service unit
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In telecommunication, the term data service unit (DSU) has the following meanings:
1. A device used for interfacing data terminal equipment (DTE) to the public switched telephone network.
2. A type of short-haul, synchronous-data line driver, usually installed at a user location, that connects user synchronous equipment over a 4-wire circuit at a preset transmission rate to a servicing central-office.
This service can be for a point-to-point or multipoint operation in a digital data network.Template:Com-stub