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1. Application (in terms of cabling infrastructure) – A system the transmission method of which is supported by telecommunications cabling, such as a 100base-TX Ethernet, or digital voice. 2. Unshielded Twisted-Pair – (UTP) a pair of copper wires twisted together with no electromagnetic shielding around them. Each wire pair is twisted many times per foot to cancel out electrical signal. 3. Shielded Twisted-Pair – A type of twisted pair cable in which the pairs are enclosed in an outer braided shield, although individual pairs may also be shielded. 4. Fiber-Optic Cable - An optical fiber cable is a cable containing one or more optical fibers. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable will be deployed. Optical fiber consists of a core and a cladding layer, selected for total internal reflection due to the difference in the refractive index between the two 5. Dark Fiber – An unused fiber; a fiber carrying no light. Common when extra fiber capacity is installed. 6. Coaxial Cable - commonly used for cable TV and old Ethernet; it is called coaxial because it has a single conductor surrounded by insulation and then a layer of shielding (which is also a conductor). 7. Plenum – the empty space between walls and drop ceilings 8. Riser – A space for indoor cables that allow cables to pass between floors, normally a vertical shaft or space. 9. Rip Cord – A length of string built into optical fiber cable that is pulled to split the outer jacket of the cable without using a blade. 10. Core – the central part of a single optical fiber in which the light signal is transmitted. 11. Attenuation –A general term indicating a decrease in power (loss of signal) from one point to another. This loss can be a loss of electrical signal or light strength. 12. Noise – In a cable or circuit, any extraneous signal that interferes with the desired signal normally present in or passing through the system. 13. Headroom – The number of decibels by which a system exceeds the minimum defined requirements. 14. ANSI – American National Standards Institute; A privet nonprofit membership organization sustained by its membership to encourage compliance with standards and methods. 15. NFPA – National Fire Protection Association; The NFPA mission is to help reduce the risk of fire though codes, safety requirements, research, and fire-related education. 16. FCC – Federal communications commission. The federal agency responsible for regulating broadcast and electronic communications in the United States. 17. NIST – National Institute of standards and Technology; assisting the improvement and development of manufacturing technology, improving quality and reliability and encouraging scientific discovery. 18. OSHA – Occupational Safety and Health Administration passes laws designed to protected employees from many types of job hazards. 19. Equipment Room – A centralized space for telecommunications equipment that serves the occupants of the building or multiple buildings in a campus environment. 20. Topology - The geometric physical or electrical configuration describing a local communicating network.


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