Page 104 of Current Product Catalog by World Class Wire and Cable

derivative of hdlc the most common of which is ibm s sdlc synchronous data link control hdpe ­ high density polyethylene hdtv ­ high defi nition television hdx ­ half-duplex transmission transmission in either direction but not in both directions simultaneously compare with full-duplex transmission head-end ­ a central point in broadband networks that receives signals on one set of frequency bands and transmits them on another set of frequencies henry ­ a unit of inductance equal to the inductance of a current changing at the rate of 1 ampere per second inducing a counter-electromotive force of 1 volt hertz hz cycles per second a cycle that occurs once every second has a frequency of 1 hertz the bandwidth of the average phone line is between 300 and 3,000 cycles per second hf high frequency hid ­ high intensity discharge as in mercury metal halide and sodium lamps hipot ­ dc high potential testing of medium and high voltage cables see dielectric strength testing high-split ­ a broadband cable system in which the bandwidth utilized to send toward the head-end reserve direction is approximately 6 mhz to 180 mhz and the bandwidth utilized to send from the head-endforward direction is approximately 220mhz to 400mhz the guard band between the forward and reverse directions 180 mhz to 220 mhz provides isolation from interference high tension cables generally the high voltage ignition wires for combustion engines gas and oil igniters or neon signs etc unshielded usually type gto high voltage power system voltage ratings ­ a class of nominal systems equal to or greater than 10,000 volts or less than 230,000 volts high-voltage cable termination ­ a device used for terminating alternating current power cables having laminated or extruded insulation rated 2.5kv and above hmwpe ­ high molecular weight polyethylene hot modulus stress at 100 elongation after 5 minutes of conditioning at a given temperature normally 130c hot-rolled rod the as-rolled section normally round produced by hot-rolling in a rod mil from a billet or wire bar hot stick ­ a long insulated stick having a hook at one end which is used to open energized switches etc housing ­ a metallic or other enclosure for an insulated splice hpn ­ a ul cable type two conductor thermosetting-insulated heater cord parallel construction for use in damp locations hs ­ a heater cord with two to four conductors insulated with rubber and asbestos conductor cabled outer covering is a rubber jacket ­ sizes 14 and 12 awg hsj ­ same as type hs but made in sizes 18 16 awg hsjo ­ a heater cord with two to four conductors insulated with rubber and asbestos conductors cabled outer covering neoprene jacket ­ sizes 18 and 16 awg hso a ul cable type thermoset jacketed heater cord hv ­ high voltage hydroscopic ­ readily absorbing and retaining moisture hypalon ­ csp dupont trademark for chlorosulphonated polyethylene hypot ­ see hi-pot registered trade name by associated research inc for their hi-pot tester hysteresis the time lag exhibited by a body in reacting to changes in forces affecting it an internal friction hz ­ hertz a measure of frequency or bandwidth equal to one cycle per second named after experimenter heinrich hertz impairment ­ the generic term for a flaw in phone-line quality usually caused by echo noise or a reduction in signal strength impedance ­ the total opposition a circuit cable or component offers to alternating current it includes both resistance and reactance and is generally expressed in ohms impedance characteristic ­ in a transmission cable of infi nite length the ratio of the applied voltage to the resultant current at the point the voltage is applied or the impedance which makes a transmission cable seem infi nitely long when connected across the cable s output terminals for a waveguide it is the ratio of rms voltage total rms longitudinal current at certain points on a diameter when the waveguide is matchterminated impedance high ­ generally the area of 25,000 ohms or higher impedance low ­ generally the area of 1 through 600 ohms impedance match ­ a condition whereby the impedance of a particular cable component is the same as the impedance of the circuit cable or device to which it is connected impedance matching stub ­ a section of transmission line or a pair of conductors cut to match the impedance of one circuit to that of another impulse ­ see pulse imsa international municipal signal association in-band signaling the transmission of signaling information at some frequency or frequencies that lie within a carrier channel normally used for information transmission indoor termination ­ a cable termination intended for use where it is protected from direct exposure to both solar radiation and precipitation inductance ­ a property of a conductor or circuit which resists a change in current it causes current changes to lag behind voltage changes and is measured in henrys induction ­ the phenomenon of a voltage magnetic field or electrostatic charge being produced in an object by lines of force from the source of such fields induction heating ­ heating a conducting material by placing it in a rapidly changing magnetic field the changing field induces electric currents in the material and i r losses account for the resultant heat infrared radiation radiant energy within the wavelength range of 780-1000 nanometers invisible energy given off by heated bodies which transmits heat and will pass through glass input ­ a signal or power which is applied to a piece of electric apparatus or the terminals on the apparatus to which a signal or power is applied insertion loss ­ a measure of the attenuation of a device by determining the output of a system before and after the device is inserted into the system insulated radiant heating wire ­ similar to blanket wire but heavier construction for applications such as in ceiling panels ­ buried in ground or driveway and concrete walks insulated splice ­ a splice with a dielectric medium applied over the connected conductors and adjacent cable insulation insulating isolating joint ­ a cable joint which mechanically couples and electrically separates the sheath shield and armor on contiguous lengths of cable i ­ symbol used to designate current iacs ­ international annealed copper standard for copper used in electrical conductors ica ­ integrated communications adapter provided by several ibm communications products including the 4361 9370 system/36 and system/38 on the 4361 supports microcode implementation of physical unit type 4 in the other environments supports interfaces to ibm token ring network and ccitt x.25 interfaces to packet-switched data networks icea ­ insulated cable engineers association the association of cable manufacturing engineers who make nationally recognized specifications and test for cables formerly ipcea iec ­ international electrotechnical commission ieee ­ institute of electrical and electronic engineers an international professional society that issues its own standards and is a member of ansi and iso ieee 10basese2 network ­ a network conforming to the ieee 802.3 local area network standard the network is capable of carrying information at rates up to 10mbps over distances up to 2800 meters 9184 feet ieee 10broad36 ­ 10 million bits per second over broadband coaxial cable with node-to-node coverage of 3600 meters the ieee 802.3 specification for running ethernet on broadband ieee-488 ­ institute of electrical and electronic engineers ­488 an ieee standard parallel interface bus consisting of eight bi-directional data lines eight control lines and eight signal grounds which provides for connection to an ieee-488 device iee-802 standards for the interconnection of local networking computers equipment the ieee-802 standard deals with the physical link layers of the iso reference model of osl ieee 802.3 ­ an ieee standard describing the physical and data link layers of a local area network based on bus topology and csma/cd ieee 802.4 an ieee standard describing the physical and data link layers of a local area network based on bus topology used with manufacturing automation protocol lans ieee 802.5 ­ a physical layer standard specifying a lan with a token-passing access method on a ring topology used by ibm s token ring hardware ieee 802.7 ­ a proposed physical layer standard specifying a lan using both 802.3 and 802.4 standards if ­ intermediate-frequency impact tests ­ tests designed to reveal the behavior of material of a fi nished part if it were subjected to impact or shock loading i glossary 102 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

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