A general term referring to your local company's networking environment. This term is typically used by various types of service providers who provide leased or contractual services to help you implement and support your network. For example, a cabling company would install cabling at your customer premises and call this installation premise wiring. A telecommunications company might send a representative to a customer premises in order to install a CSU/DSU (Channel Service Unit/Data Service Unit) or other device in the wiring closet to enable wide area network (WAN) communication. Typically, your company is responsible for the physical security of such installed equipment, but the actual configuration and monitoring of the equipment takes place at the telco's central office (CO).