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CSU/DSU
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{{Short description|Digital interface device}} {{refimprove|date=December 2018}} A '''CSU/DSU''' ('''channel service unit/data service unit''') is a digital-interface device used to connect [[data terminal equipment]] (DTE), such as a [[Router (computing)|router]], to a [[digital circuit]], such as a [[Digital Signal 1]] (DS1) T1 line. The CSU/DSU implements two different functions. The [[channel service unit]] (CSU) is responsible for the connection to the [[telecommunication]] network, while the [[data service unit]] (DSU) is responsible for managing the interface with the DTE. A CSU/DSU can have an external connection point or it can be integrated into a modular card installed in a router. A CSU/DSU is the equivalent of the modem for an entire [[LAN]]. The [[Data circuit-terminating equipment|DCE]], commonly a modem or CSU/DSU, is the device used to convert the user data from the DTE into a form acceptable to the WAN service provider transmission link. <ref>{{cite book|last=Microsoft Official Academic Course|title=98-366: MTA Networking Fundamentals|year=2012|publisher=John Wiley & Sons|location=Hoboken, NJ|isbn=978-0-470-90183-0|pages=151|url=http://customselect.wiley.com/book/9780470901830}}</ref>
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