CSU/DSU

Short for Channel Service Unit/Data Service Unit, CSU/DSU is a hardware device used to connect and translate the signal coming from a digital line to a computer or network. For example, a user or business who has a T1 line will have a CSU/DSU connected to their network to translate incoming and outgoing data and allow their network to work over the T1 line.

Also see: Network definitions, T1, T2, T3