CSU/DSU

<p>A CSU/DSU (channel service unit/data service unit) is a digital-interface device used to connect <a href="/facts/Data_terminal_equipment/o7qvJVQq">data terminal equipment</a> (DTE), such as a <a href="/facts/Router_(computing)/Nh5cIyVf">router</a>, to a <a href="/facts/Digital_circuit/vWgfC29C">digital circuit</a>, such as a <a href="/facts/Digital_Signal_1/cghJPRpQ">Digital Signal 1</a> (DS1) T1 line. The CSU/DSU implements two different functions. The  <a href="/facts/Channel_service_unit/yCXND09l">channel service unit</a> (CSU) is responsible for the connection to the <a href="/facts/Telecommunication/vxoj1cxR">telecommunication</a> network, while the <a href="/facts/Data_service_unit/MUEkGogG">data service unit</a> (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.
</p><p>A CSU/DSU is the equivalent of the modem for an entire <a href="/facts/LAN/edUDxJ6J">LAN</a>. The <a href="/facts/Data_circuit-terminating_equipment/asE4FHvh">DCE</a>, 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.

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CSU/DSU open-in-new

CSU/DSU