1. Horizontal cable-A type of inside cable designed for horizontal use in non-plenum areas. While horizontal cable must be fire retardant, the National Electrical Code (NEC) specifications are not as demanding as those governing the use of plenum cable or riser cable. 2. Backbone cable- the inter-building and intra-building cable connections in structured cabling between entrance facilities, equipment rooms and telecommunications closets. Backbone cabling consists of the transmission media, main and intermediate cross-connects and terminations at these locations. 3. Patch cords-an electrical or optical cable used to connect ("patch-in") one electronic or optical device to another for signal routing. 4. Connectors- a device for keeping 2 electrical circuits in contact. 5. Conduit- a tube or trough for protecting electric wire 6. Racks- a device to hold and manage how your servers are setup 7. Punch-down blocks-is a type of electrical connection often used in telephony. 8. Consolidation points- a central point for connecting equipment in an open-office multiuser environment. 9. Crimpers-a device to press two metal pieces together and the pressure makes them stay in place. 10. Fish Tape- tool used by electricians to route new wiring through walls and electrical conduit 11. Cable toner- an electronic device used to verify the electrical connections in a cable or other wired assembly. 12. Catergory 5e/6 cable- an electronic device used to verify the electrical connections in a cable or other wired assembly. 13. Binder groups-A group of wire pairs bound together, usually by some sort of color-coded plastic tape or thread. 14. Hybrid cable- a telecommunications industry term for a broadband network that combines optical fiber and coaxial cable. 15. Continuity tester- an item of electrical test equipment used to determine if an electrical path can be established between two points 16. Pulling cable- A substance which facilitates the pulling of wires through a cable duct or conduit. 17. Wavelengths of light- Electromagnetic radiation in this range of wavelengths is called visible light or simply light. 18. EMI- a British multinational music recording and publishing company, and electronics device and systems manufacturing company, headquartered in London, England. 19. Optical-Fiber Strand- a thin wire of glass or plastic that has multiple strands and is wrapped around each other 20. Index of refraction- an optical medium is a dimensionless number that describes how light, or any other radiation, propagates through that medium. 21. Cable jacket- A protective outer covering for a cable. 22. Cladding size- A metal coating bonded onto another metal under high pressure and temperature. 23. Multifiber cables- fiber-optic cable having two or more fibers, each of which is capable of serving as an independent optical transmission channel. 24. Differential mode delay- When an unconditioned laser source designed for operation on single-mode fiber cable is directly coupled to an MMF cable, differential mode delay can occur 25. Chromatic dispersion- an optical medium is the phenomenon that the phase velocity and group velocity of light propagating in a transparent medium depend on the optical frequency.