Issue link: http://www.e-digitaleditions.com/i/137513
Network Cabling Solutions Appendix multimedia 1. An application that communicates to more than one of the human sensory receptors. 2. Applications that communicate information by more than one means or cabling media. multimode Optical Fiber An optical fiber that will allow many bound modes to propagate. The fiber may be either a graded index or step index fiber. multimode optical fibers have a much larger core than single mode fibers. multi-User Telecommunications Outlet Assembly (mUTOA) A grouping in one location of several telecommunications / outlet connectors. N Nanosecond (ns) One billionth of a second. Near-End Crosstalk (NEXT Loss) The undesired coupling of a signal from one pair of wires to another. Signal distortion as a result of signal coupling from one pair to another at various frequencies. Network Demarcation Point The point of interconnection between the local exchange carrier's telecommunication facilities and the telecommunications systems wiring and equipment as the end user's facility. This point shall be located on the subscriber side of the telephone company's protector or the equivalent thereof in cases where a protector is not required. Plenum A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system. Power Sum Alien Far-End Crosstalk Loss (PSAFEXT) Power sum of the unwanted signal coupling from multiple disturbing pairs of one or more 4-pair channels, permanent links, or components to a disturbed pair of another 4-pair channel, permanent link, or component, measured at the far-end. Power Sum Alien Near-End Crosstalk Loss (PSANEXT) Power sum of the unwanted signal coupling from multiple disturbing pairs of one or more 4-pair channels, permanent links, or components to a disturbed pair of another 4-pair channel, permanent link, or component, measured at the near-end. Power Sum Attenuation to Alien Crosstalk Ratio Far-End (PSAACRF) Difference, in dB, between the power sum alien far-end crosstalk from multiple disturbing pairs of one or more 4-pair channels, permanent links, or components and the insertion loss of the disturbed pair in another 4-pair channel permanent link or component. Previously referred to as power sum equal level far-end crosstalk (PSELFEXT) before 6A standard was released. Power Sum Equal Level Far-End Crosstalk (PSELFEXT) A computation of the unwanted signal coupling from multiple transmitters at the near-end into a pair measured at the farend, and normalized to the received signal level. O Open Office Cabling The cabling that distributes from the telecommunications closet to the open office area utilizing a consolidation point or multi-user telecommunications outlet assembly. Outlet, Telecommunications A fixed connecting device where the horizontal cable terminates. The telecommunications outlet provides the interface to the work area cabling. Sometimes referred to as a telecommunications outlet/connector. P Patch Cord A length of cable with connectors on one or both ends used to join telecommunications links at a cross connect. Patch Panel Connecting hardware that typically provides means to connect horizontal or backbone cables to an arrangement of fixed connectors that may be accessed using patch cords or equipment cords to form cross connections or interconnections. Power Sum Near-End Crosstalk (PSNEXT) A computation of the unwanted signal coupling from multiple transmitters at the near-end into a pair measured at the near-end. Private Branch Exchange (PBX) A private switching system usually serving an organization, such as a business, located on the customer's premises. It switches calls both inside a building or premises and outside to the telephone network, and can sometimes provide access to a computer from a data terminal. Propagation Delay The amount of time that passes between when a signal is transmitted and when it is received at the opposite end of a cable or cabling. Punch Down A method for securing wire to a quick clip in which the insulated wire is placed in the terminal groove and pushed down with a special tool. As the wire is seated, the terminal displaces the wire insulation to make an electrical connection. The punch down operation may also trim the wire as it terminates. Also called cut down. Pathway A facility (i.e. conduit) for the placement and protection of telecommunications cables. Same as raceway or ducting. For product information visit www.hellermann.tyton.com or call 800.537.1512 227