Structured cabling is the passive infrastructure that supports the transmission of data, voice, and video signals in a building or campus. It consists of various components, including twisted pair cables, fiber optic cables, and cable accessories. Twisted pair cables are the most common type of cabling used in structured cabling systems. They are composed of two insulated copper conductors that are twisted together to reduce electromagnetic interference (EMI). The most common types of twisted pair cables used in structured cabling are UTP (Unshielded Twisted Pair) and FTP (Foiled Twisted Pair). Fiber optic cables are another type of cabling used in structured cabling systems. They are made up of glass or plastic cores that transmit light signals. Fiber optic cables are generally used for long distances or high-bandwidth applications. Structured cabling systems typically include a variety of components, such as closures, patch panels, outlets, modules, racks, and cabinets. Closures are used to terminate and splice cables. Patch panels are used to connect cables to other network devices. Outlets are used to provide access to the network for end users. Modules are used to connect cables to patch panels. Racks and cabinets are used to house and organize cabling components. The type of cabling and components used in a structured cabling system will depend on the specific needs of the network.