Page 97 of Current Product Catalog by World Class Wire and Cable

a a common abbreviation for ampere aar american association of railroads term or imaginary part is called susceptance and is denoted as b it is expressed in mhos adp automatic data processing adpcm adaptive differential pulse code modulation an encoding technique standardized by the ccitt that allows an analog voice conversation to be carried within a 32k bps digital channel three or four bits are used to describe each sample which represents the difference between two adjacent samples sampling is done 8,000 times per second adu asynchronous data unit advm adaptive variable slope delta modulation voice modem aec atomic energy commission ­ now defunct see erda and nrc aeic association of edison illuminating companies af audio frequency bell circuits and other low voltage systems ansi american national standards institute an organization that publishes nationally recognized standards antenna lead-in wire not coaxial parallel twin lead construction plastic jacketed with fi xed 300 ohm impedance for connecting remote antenna to receivers antenna rotor cable multi-conductor flat or round cable used to supply power to motorized antenna and control wires for changing direction of rotation antioxidant retards or prevents degradation of materials exposed to oxygen air or peroxides approved 1 acceptable to the authority having legal enforcement a product that has been tested to standards and found suitable for general application subject to limitations outlined in the nationally recognized testing lab s listing arc attached resource computer the local networking products and philosophy developed by datapoint corporation armature 1 rotating machine the member in which alternating voltage is generated 2 electromagnetic the member which is moved by magnetic force armor mechanical protector for cables usually a helical winding of metal tape formed so that each convolution locks mechanically upon the previous one interlocked armor may be a formed metal tube or a helical wrap of wires arpa advanced research projects agency ­ agency that developed the fi rst major packet-switched network arpanet arq automatic request for retransmission an error control method in which the receiving device informs the transmitting device which transmission blocks were received successfully the transmitting device retransmits any blocks not successfully received arrhenius plot a statistical method used to predict time-to-failure based on a device s performance at different temperatures one method is given in ieee standard 101 asc automatic digital network switching center abrasion resistance ability to resist surface wear abswitch a coaxial cable switch capable of switching one cable to one of two branch cables a or b ac alternating current ac a ul cable type branch circuit and feeder cables with flexible metal tape armor acar aluminum conductor aluminum-reinforced cable accelerated aging a test that duplicates long time environmental conditions in a relatively short time acceptance test made to demonstrate the degree of compliance with specified requirements acf access control facility a group of ibm products that implement sna concepts such as distribution of function and resource sharing ack acknowledgement character in binary synchronous communications a control character sent to indicate that the previous transmission block was accepted by the receiver and that it is ready to accept the next block acsr aluminum conductor steel reinforced transmission cable a bare composite of aluminum and steel wires usually aluminum around steel acsr/aw aluminum conductor steel reinforced using aluminum clad steel wire agc automatic gain control aging the irreversible change of material properties after exposure to an environment for an interval of time aia aluminum interlocked armor a type of cable sheath al aluminum alloy a substance having metallic properties and being composed of an elemental metal and one or more chemical elements alternating current electric current that periodically reverses direction alternating current is generally abbreviated ac am amplitude modulation a method of adding information to an electronic signal where the height amplitude of the wave is changed to convey the added information ambient conditions existing at a test operation location prior to energizing of equipment example ambient temperature ambient temperature the temperature of a cable group when there is no load on any cable of the group or of the duct containing the group ampacity the rms current which a device can carry within specified temperature limitations in a specified environment dependent upon a temperature rating b power loss or c heat dissipation ampere a standard unit of current designed as the amount of current that occurs when one volt of emf is applied across one ohm of resistance an ampere of current is produced by one coulomb of charge passing a point in one second ampere-turn the product of amperes times the number of turns in a coil amplifier a device used to boost the strength of an electronic signal amplitude the maximum value of a varying waveform analog not digital a continuously varying waveform anneal to soften and relieve strains in any solid material such as metal or glass by heating to just below its melting point and then slowly cooling it this also generally lowers the tensile strength of the material while improving its flex life annealed wire see soft wire annunciator wire usually single solid copper sometimes twisted pair or triplexed for open wiring of acsr/az aluminum conductor steel reinforced using aluminum steel wire acsr/ga aluminum conductor steel reinforced using class a zinc coated steel wire acsr/gb aluminum conductor steel reinforced using class b zinc coated steel wire acsr/gc aluminum conductor steel reinforced using class c zinc coated steel wire act acknowledgement a control character used with nak in bsc communications protocol to indicate that the previous transmission block was correctly received and that the receiver is ready to accept the next block also used as a ready reply in other communications protocols such as hewlettpackard s enq/ack protocol and the etx/ack method of flow control acu automatic calling unit a unit which may or may not be integrated within a modem that automatically dials calls based on digits supplied by the attached business machine a/d analog/digital an integrated circuit device that converts analog signals such as varying levels of heat to cold soft to hard quiet to loud dim to bright increased to decreased flow etc to digital signals initiating them adccp advanced data communications control procedure the usa federal standard communications protocol address the location of a terminal a peripheral device a node or any other unit or component in a network administrative authority an organization exercising jurisdiction over the national electrical safety code admittance a measure of how easily alternating current flows in a circuit admittance is the reciprocal of impedance admittance y can be expressed as a complex number y=g+jb the fi rst terms or real part is called conductance and is denoted as g the second ascii american national standard code for information interchange a seven bit plus parity code established by the american national standards institute to achieve compatibility among data services and consisting of 96 displayed upper and lower case characters and 32 non-displayed control codes askarel a synthetic insulating oil which is nonflammable but very toxic it is being replaced by silicone oils astm american society for testing and materials ­ a group writing standards for testing materials and specifications for materials async asynchronous asynchronous transmission in which each information character is individually synchronized usually by means of start and stop elements also called start-stop transmission atdm asynchronous time-division multiplexing a tdm that multiplexes asynchronous signals by over sampling also infrequently used to mean concentrator ate automatic test equipment at&t american telephone and telegraph a major common carrier for long distance telephone lines attenuation the decrease in magnitude of a wave as it travels through any transmitting medium such as a cable or circuitry attenuation is measured as a ratio or 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 95 glossary glossary

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