% WHEY ELECERECAL ANB A
`ELECTRONICS ENGINEEMNG
`%
`DICTEGNARY
`
`Steven M. Kaplan
`Lexicographer
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`IEEE
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`IEEE PRESS
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`WILEY"
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`INTERSCH ENCIE
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`A JOHN WILEY & SONS, INC., PUBLICATION
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`POLYGROUP EX. 1048
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`POLYGROUP V. WILLIS
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`Page 1
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`Copyright © 2004 by John Wiley & Sons, lnc. All rights reserved.
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`Published by John Wiley & Sons, Inc., Hoboken, New Jersey.
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`Library of Congress Cataloging-1'u-Publication Data is available.
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`Kaplan, Steven M.
`
`Wiley Electrical and Electronics Engineering Dictionary
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`ISBN 0-471-40224-9
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`Printed in the United States ofAmerica.
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`10987654321
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`terminal adapter
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`781
`
`terminal adapter Abbreviation of ISDN terminal adapter.
`A device which interfaces an ISDN line with a user's
`equipment, such as a computer. Such an adapter may be
`connected, For example, to a serial port.
`Its own abbrevia-
`tion is TA.
`
`terminal area On a printed-circuit board, the printed conduc-
`tive portion to which components are connected. Said espe-
`cially of such portions which run along the edge of said
`board. Also called terminal pad, pad (2), or land (4).
`terminal block An insulated block equipped with multiple
`terminals, which enables the mounting and interconnection
`of circuits. Used, for instance, to connect multiple telephone
`pairs.
`'
`terminal board An insulated board equipped" with multiple
`terminals, which enables the interconnection of wires or ca-
`bles. Such temiinals may be, for instance,
`in the form of
`binding posts or lugs. Also called terminal strip.
`terminal emulation The ability to make one computer termi-
`nal appear as another type of terminal to another. Terminal
`emulation is used, for instance,
`to enable a user with a
`graphical-uscr interface to log—on to and enter commands
`into a text-based system such as an older mainframe.
`in this
`manner, such a terminal appears to the accessed mainframe
`as another mainframe.
`
`terminal equipment The equipment at the end of a commu-
`nications line or channel. For example, ISDN equipment
`located at the premises of a customer.
`its abbreviation is
`TE.
`
`terminal ID Abbreviation of terminal identification. The
`number or sequence of characters which identifies a specific
`network terminal, or a component such as a card. Examples
`include Ethernet addresses and those of network nodes.
`terminal identification Same as terminal ID.
`
`terminal impedance For a circuit, device, or transmission
`line, the impedance as seen from the input or output termi-
`nals.
`
`'
`
`terminal lug A fitting or projection which serves to connect a
`wire by wrapping or through soldering. Also called lug (1).
`terminal node In a hierarchical structure, such as a tree, a
`node which has no descendants.
`In a hierarchical file sys-
`tem, for example, a file is a leaf. Also called leaf (1), or leaf
`node
`
`terminal pad Same as terminal area.
`terminal pair A pair of terminals which are linked. For ex-
`ample, the positive and negative terminals of a speaker.
`terminal radar approach control The use of radar equip-
`ment as part of an air traffic control service, as is usually the
`case.
`its acronym is TRACON. Also called radar ap-
`proach control.
`terminal server A computer, controller, or other hardware
`device which provides terminals or nodes with a common
`connection point‘ to a network such as a LAN or WAN. A
`terminal server enables the connection of multiple computer
`terminals, printers, or the like,
`to one or more host com-
`puters.
`terminal session A session during which a terminal, such as a
`node or a mainframe, is in use.
`
`terminal strip Same as terminal board.
`terminal voltage The voltage at the output temiinals of a
`component, circuit, or device. An example is a no-load
`voltage.
`terminate 1. To end a transmission line with a termination.
`2. To end a program, routine, process, or the like.
`terminate and stay resident Same as TSR.
`terminated line A transmission line with a termination, so as
`to avoid retleetions and standing waves. Also called termi-
`nated transmission line.
`
`tessellation
`
`terminated transmission line Same as terminated line.
`
`termination The point at which a transmission line (1) ends.
`Also, a device within which such a tennination occurs. For
`example, a power outlet, or a channel service unit. Also
`called or transmission line termination, or line termina-
`tion.
`terminator 1. A character or code which indicates the end of
`a string. 2. A hardware device or component which serves
`as the last device when multiple devices or nodes are con-
`nected in series, so as to avoid signals from refiecting back
`into the line. Used, for instance, as a SCSI termination, or
`as a transmission line termination.
`Terms Of Service Norms regulating the usage of computer
`services, especially those of networks such as the lntemet.
`The providers of the service establish what activities are and
`are not acceptable when using said service. A common ex-
`ample is an Internet service provider prohibiting sending un-
`solicited email or using an account for certain commercial
`purposes.
`its abbreviation is TOS. Also called acceptable
`use policy.
`incorporating, or appearing in,
`ternary
`1. Consisting of,
`groups of three. 2. Having three possible values, states, or
`the like. 3. Having a base of three. Said of a number sys-
`tem.
`
`ternary alloy An alloy consisting of three elements.
`terrain-clearance indicator An instrument which measures
`and indicates altitude above a given terrain by the utilization
`of radio, radar, laser, sonic, or capacitive tcclmology.
`It is a
`type of absolute altimeter.
`terrain clutter In radars, unwanted echoes that appear on the
`display screen due to signal reflections from the surface of
`the earth. Also called terrain return, terrain echoes, sur-
`face clutter, land return, or ground clutter.
`terrain echoes Same as terrain clutter.
`terrain return Same as terrain clutter.
`
`terrestrial magnetism The magnetism of the planet earth.
`Also called gcomagnetism.
`technology, or
`Terrestrial Microwave A system, method,
`service, such as Multichannel Multipoint Distribution Ser-
`vice, which utilizes microwave line-of-sight communica-
`tions between sending and receiving units located on the
`ground or on towers, as opposed to a sender and/or receiver
`antenna being located on a communications satellite. Used,
`for instance, for telephone, TV, and/or data services. Also
`called Terrestrial Microwave Radio.
`Terrestrial Microwave Radio Same as Terrestrial Micro-
`wave.
`
`tertiary coil Same as tertiary winding.
`tertiary winding A third winding on a transfomier. Also
`called tertiary coil.
`It is defined as the
`tesla The Si unit of magnetic flux density.
`field strength generating one newton of force per ampere per
`meter of a conductor. One tesla is equal to one weber per
`square meter, or 10" gauss. Its symbol is '1‘.
`Tesla coil An air-core transformer which develops a high
`voltage at high frequencies.
`In a typical configuration, the
`primary cell consists of a few tums of large-diameter wire,
`while the secondary has many turns of a small-diameter
`wire. A properly selected capacitor is charged to a voltage
`of several thousand volts, then discharged through the pri-
`mary, with the process being repeated hundred of times with
`the assistance of a spark gap. The secondary inductively ab-
`sorbs energy from the primary, magnifying the voltage fur-
`ther, to levels of hundreds of thousands or millions of volts.
`Also called Tesla transformer.
`
`Tesla transformer Same as Tesla coil.
`tessellation In computer-assisted modeling, the representation
`' of 3D objects by creating a mosaic formed by small trian-
`gles, squares, or the like.
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