Page 109 of Current Product Catalog by World Class Wire and Cable

and retractable premolded splice ­ a joint made of premolded components assembled in the field production routine tests ­ tests made on components or subassemblies during production for the purpose of quality control prom programmable read-only memory permanently stored data in a nonvolatile semiconductor device protective covering ­ a field-applied material to provide environmental protection over the splice or housing or both ps a thermostat cable with two or more solid conductors rubber insulation with cotton braid over insulation conductors cabled outer covering treated cotton braid psk ­ phase shift keying a phase modulation technique in which phase shifts represent signaling elements psn ­ packet switching network a network which enables external computers and terminals to communicate with other computers linked to the network ppsn uses packet switching to transmit data connections to psn are governed by a series of recommendations known collectively as x.25 pt ­ thermostat cable with solid conductor individual insulation twisted together ptfe ­ tfe teflon polytetrafluoroethylene ptt ­ post telephone and telegraph authority the government agency that functions as the communications common carrier and administrator in many areas of the world pulse ­ a current or voltage which changes abruptly from one value to another and back to the original value in a fi nite length of time pvc ­ polyvinylchloride a common insulating and jacketing material used on cables pvdf ­ kynar atochem trademark for polyvinylidene fluoride reactance ­ the opposition offered an alternating electron flow by a capacitance or inductance the amount of such opposition varies with the frequency of the current the reactance of a capacitor decreases with an increase in frequency the opposite occurs with an inductance reflection ­ the change in direction or return of waves striking a surface for example electromagnetic energy reflections can occur at an impedance mismatch in a transmission line causing standing waves reliability ­ the probability that a device will function without failure over a specified time period or amount of usage resistance ­ in dc circuits the opposition a material offers to current measured in ohms in ac circuits resistance is the real component of impedance and may be higher than the value measured at dc resistivity ­ a material characteristic opposing the flow of energy through the material expressed as a constant for each material is affected by temper temperature contamination alloying coating etc the ability to resist the flow of electrical current either through the bulk of the material or on its surface the unit of volume resistivity is the ohm-cm resistor code color ­ a method of indicating resistance value and tolerance the fi rst color represents the fi rst significant figure of the value a second color represents the second significant figure and the third is the multiplier or the number of zeros that follow two significant figures when there is a fourth color band it indicates the tolerance resonance an ac circuit condition in which inductive and capacitive reactances interact to cause a minimum or maximum circuit impedance retractile cord a cord having specially treated insulation or jacket so that it will retract like a spring retractability may be added to all or part of a cord s length rf ­ radio frequency uses electromagnetic waveforms used for transmission usually in the megahertz mhz range electromagnetic waves are usually transmitted between 500 khz and 300 ghz rfi ­ radio frequency interference the disruption of radio signal reception caused by any source which generates radio waves at the same frequency and along the same path as the desired wave rf modem radio frequency modem device used to convert digital data signals to analog signals and from analog to digital then modulate/demodulate them to/from their assigned frequencies rg/u ­ rg is the military designation for coaxial cable and u stands for general utility rh ­ rubber-insulated heat resistant building wire 75c rhd ­ a twin parallel cable heat resisting rubber insulation outer fi nish treated cotton braid rhdl ­ same as rhd without braid and a lead sheath overall rhh ­ rubber-insulated heat resistant building wire 90c rh/rw ­ rubber-insulated heat and moisture resistant building wire 75c dry 60c wet rhw rubber-insulated building wire heat and moisture resistant 75cdry or wet rhw-2 ­ rubber-insulated building wire heat and moisture resistant 90c dry and wet ring ­ a network topology in which stations are connected to one another in a closed logical circle typically access to the media passes sequentially from one station to the next by means of polling from a master station or by passing an access token from one station to another rise time ­ the time it takes the voltage to rise from 0.1 to 0.9 of its fi nal value riv radio influence voltage the radio noise appearing on conductors of electric equipment or circuits rj11 ­ a two four six or eight contact modular phone type plug rj45 ­ an eight position modular at t phone-type plug that can accommodate up to eight wires rms ­ root-mean-square rockwell hardness ­ a measure of hardness determined by resistance to indentation by a small diamond or steel ball under pressure rom ­ read-only memory nonvolatile semiconductor storage device manufactured with predefi ned contents compare with eprom prom and ram romex ­ a type of nonmetallic sheathed cable root-mean-squarerms ­ in a periodic quantity this is the square root of the average or mean of the squares of the quantity taken over a complete period rope-lay conductor ­ see concentric-lay conductor rope strand ­ a conductor composed of a center group of twisted strands surrounded by layers of twisted strands routine tests ­ tests made on each high-voltage cable termination or upon a representative number of devices or parts thereof during production for the purposes of quality control rr ­ a cable with one or more rubber insulated conductors neoprene jacket overall non-portable rulan ­ is a flame retardant polyethylene which has additives to inhibit the rate of burning the additives have only a slight effect on physical or electrical properties of the insulation rs-232 ­ an eia recommended standard rs most common standard for connecting data processing devices rs_232 defi nes the electrical characteristics of the signals in the cable that connect dte with dce it specifies a 25-pin connector the db-25 connector is almost universally used in rs-232 applications and it is functionally identical to ccitt v.24/v.28 rs-232-c ­ a technical specification published by the eia that specifies the mechanical and electrical characteristics of the interface for connecting dte and dce it defi nes interface circuit functions and their corresponding connector pin assignments the standard applies to both asynchronous and synchronous serial binary data transmission at speeds up to 20 kbps in full or half-duplex mode rs-232-c defi nes 20 specific functions the physical connection between dte and dce is made through plug-in 25-pin connectors rs-232-c is functionally compatible with the ccitt recommendation v.24 rs232-c serial i/o port a standard connection interface for computer peripheral equipment rs-422 ­ a standard operating in conjunction with rs-449 that specifies electrical characteristics for balanced circuits an eia recommended standard for cable lengths that extended the rs-232 50-foot limit although introduced as a companion standard with rs-422 rs-423 is not widely used electrically compatible with ccitt recommendation v.10 rs-449 ­ another eia standard for dte/dce connection which specifies interface requirements for q r q band ­ the band of frequencies between 36 and 46 gigahertz quadrature amplitude modulation qam ­ the modulation technique used in 9,600 bps modems that adhere to the v.32 standard in which the signal varies in amplitude voltage or strength and phase r ­ symbol for resistance or resistor radio frequency ­ the frequencies in the electromagnetic spectrum that are used for radio communications a band of frequencies between 10 kilohertz and 100 gigahertz ram random access memory a storage device into which data can be entered written and read usually but not always a volatile semiconductor memory rated strength ­ the strength in tension of a stranded conductor calculated with specification requirements rboc ­ regional bell operating company rd ­ a two conductor twin parallel cable rubber insulation treated cotton braid overall rdl ­ same as rd with lead sheath overall rea rural electrification administration ­ a federally supported program to provide electrical service to rural areas 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 107 glossary

[close]