Channel Service Unit. Usually a customer-owned CPE device that provides an interface between digital equipment (like codecs) and transmission facilities that comply with FCC or other regulatory requirements. A CSU often includes network switching and control and/or line-conditioning capabilities.
Consumer Safety Unit (UK)
Customer Set Up. The Machine has been designated to be set up by customers. This includes initial installation and add-on features provided after the initial installation. The customer is responsible for the planning, site preparation, installation and configuration of the Machine including external cables and devices. Customers may request IBM to perform these activities for a charge.