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, 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 conn… WebDec 15, 2024 · The CSU/DSUs on each end of a T1 link apply framing logic to the serial data stream in each direction on the link. The framing process allows a device to identify the individual DS0 channels, as well as overhead bits. The overhead bits are used for synchronization and framing, management, and a CRC error check.
T1 Framing and Encoding - Routing and Switching - Cisco …
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CSU Campus Login Selector - California State University
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