The channel service unit/data service unit (CSU/DSU) is a device that is positioned between the circuit connection provided by the WAN provider and the router on the other side. When the signal arrives from the digital WAN connection, it is converted into a signal the router can understand. The CSU/DSU device, which is a single box, contains two logical elements that provide different services:
- The CSU faces the service provider side
- The DSU provides data for the CPE (router)
The CSU/DSU can be a physical device placed between the demarcation . . .
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