Page 107 of Current Product Catalog by World Class Wire and Cable

to send toward the head-end reverse direction is approximately 5mhz to 100mhz and the bandwidth utilized to send away from the head-end forward direction is approximately 160 mhz to 300 mhz the guard band between the forward and reverse directions 100 mhz to 160 mhz provides isolation from interference mil ­ a unit of length equal to one thousandth of an inch mil military specification milli ­ prefi x meaning one-thousandth mips ­ millions of instructions per second one measure of processing power mj ­ modular jack a jack used for connecting voice cables to a faceplate mm mining machine cable mmj ­ modified modular jack a jack used for connecting data cables to a faceplate modem ­ a contraction of modulate and demodulate a conversion device installed in pairs at each end of an analog communications line the modem at the transmitting end modulates digital signals received locally from a computer or terminal the modem at the receiving end demodulates the incoming analog signal converting it back to its original i.e digital format and passes it to the destination device modulus of elasticity ­ the ratio of stress force to strain deformation in a material that is elastically deformed mono filament ­ a single strand filament as opposed to a braided or twisted filament mpf ­ mine power feeder cable 5-8-15kv msha ­ mine safety and health administration the federal enforcement agency for employee safety in mines and mills formerly known as ­ mesa bureau of mines msha regulations appear in cfr title 30 chapter 1 mtbf ­ mean-time between-failure a figure of merit for electronic equipment or systems that indicates the average duration of periods of fault-free operation used in conjunction with mtbf to derive availability figure mttr ­ mean-time-to-repair a figure of merit for electronic equipment or systems that indicates the average time required to fi x the equipment or system used in conjunction with mtbf to derive availability figures mtw ­ machine tool wire thermoplastic-insulated 90c to 105c 600v multicast ­ the ability to braodcast messages to one node or a select group of nodes multidrop ­ see multipoint circuit multimode ­ optical fiber which allows more than one mode of light to propagate a step-index fiber has a core of uniform refractive index while in a gradedindex fiber the refractive index of the core smoothly varies with the radius multiplex ­ the use of a common physical channel in order to make two or more logical channels either by splitting of the frequency band frequency-division multiplex or by utilizing this common channel at different points in time time-division multiplex multiplexer ­ equipment that permits simultaneous transmission of multiple signals over one physical circuit multipoint circuit ­ a single line connecting three or more stations murray loop test ­ a method used to localize cable fault mutual capacitance ­ capacitance between two conductors in a cable mux ­ multiplex to transmit two or more signals over a single channel muxer ­ multiplexer electronic equipment which allows two or more signals to pass over one telephone line mv ­ millivolt one-thousandth of a volt mv ­ medium voltage cables usually rated 5-35kv mw ­ milliwatt one-thousandth of a watt mylar ­ dupont trademark for polyethylene terephtalate polyester fi rm see melinex nfpa ­ national fire protection association nm ­ non-metallic sheathed cable braid or plastic covered for dry use 90c conductor rating nm-b ­ a ul cable type nmc ­ non-metallic sheathed cable plastic or neoprene covered wet or dry use 90c conductor rating node ­ a station noise ­ in a cable or circuit any extraneous sounds or signal which tends to interfere with the sound or signal normally present in or passing through the system nomex ­ dupont trademark for a temperature resistant flame retardant nylon nominal ­ name or identifying value of a measurable property by which a conductor or component or property of a conductor is identified and to which tolerances are applied nominal voltage national electrical code ­ sa nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class as 120/240 480y/277 600 etc the actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment nomograph ­ a chart or diagram with which equations can be solved graphically by placing a straight edge on two known values and reading the answer where the straight edge crosses the scale of the unknown value nrhw ­ a cable with conductors insulated with heat resisting rubber with a neoprene jacket overall suitable for installation in ducts dry and wet locations ­ 75c 600v nrz ­ non -return to zero the common encoding of binary stream into two voltage levels nrzi ­ non-return to zero inverted in sdlco a binary encoding technique in which a change in state represents a binary 0 and no change in state represents a binary 1 nsd ­ a three conductor service drop cable two polyethylene insulated conductors cabled with a bare neutral conductor which acts as a supporting messenger n-series connector ­ a coaxial connector rg-8/u used in standard ethernet networks ntsc national television standard committee the us color tv standard numerical aperture ­ the acceptance angle of an optical fiber which determines the angle at which light can enter the fiber expressed as a number which is equivalent to the sine of the angle nylon ­ an abrasion-resistant thermoplastic with good chemical resistance polyamide n nbr ­ butadiene-acrylonitrile copolymer rubber a material with good oil and chemical resistance nbr/pvc a blend of acrylonitrile-butadiene rubber and polyvinyl chloride pvc used for jacketing nbs ­ national bureau of standards now called nist national institute of standards and technology n connector a threaded connector for coax n is names after paul neill nec ­ national electrical code nema ­ national electrical manufacturers association neoprene a synthetic rubber with good resistance to oil chemical and flame also called polychloroprene net/one ­ the ungermann-bass local area network for heterogeneous device interconnection which is available in baseband broadband and fiber optic versions network ­ a series of nodes connected by communications channels network interface card ­ also called controller card pc expansion card controller board network interface controller adapter card adapter board network adapter module and/or network interface module its function is to allow the workstation to be physically and electrically connected to some specific network at the physical and data link layer network interface controller ­ a communications device that allows interconnection of information processing devices to a network network interface unit nui ­ the ungermannbass inc trademarked name for its network interface controller network management ­ administrative services performed in managing a network such as network topology and software configuration downloading of software monitoring network performance maintaining network operations and diagnosing and trouble shooting problems network management console nmc the ungermann-bass device which provides the execution environment for net/one network management software and utility programs and storage to be downloaded into net/one components in the network network protection device ­ a device which provides isolation between pbx circuits and co trunks or tie lines network service ­ an application available on a network e.g file transfer newton ­ the derived si unit for force the force which will give one kilogram mass an acceleration of one meter per second o od ­ outside diameter oem ­ original equipment manufacturer ofhc ­ oxygen-free high conductivity copper ohm the electrical unit of resistance the value of resistance through which a potential difference of one volt will maintain a current of one ampere ohm s law ­ stated e ir i e/r or r e/i where e is voltage i is current and r is resistance open circuit ­ a break in an electrical circuit so that there can be no current flow optical encoder ­ a device whose position is determined by a photoelectric device and converted to corporate headquarters w234 n2091 ridgeview parkway court waukesha wi 53188-1023 www.wcwc.com phone 262.951.7777 purchasing/acct fax 262.951.7704 sales fax 262.951.7778 105 glossary

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