Structured cabling is building or campus telecommunications cabling infrastructure that consists of a number of standardized smaller elements; Entrance Facilities are where the building interfaces with the outside world. Equipment Rooms host equipment which serve the users inside the building. Telecommunications Rooms house telecommunication equipment which connect the backbone and the horizontal cabling subsystems. Backbone Cabling connect between the entrance facilities, equipment rooms and telecommunications rooms. Horizontal Cabling connect telecommunications rooms to individual outlets on the floor. Work-Area Components connect end-user equipment to outlets of the horizontal cabling system.