ATM switch (asynchronous transfer mode switch)With reference to both analog and digital interfaces, the ATM functional unit and technology that operates with analog 2-wire interfaces and standard…
ATMDFAir and Theater Missile Defense Force (US Army term).
ATMDPOArmy Theater Missile Defense Program Office.
atmospheric ductA horizontal layer in the lower atmosphere in which the vertical refractive index gradients are such that radio signals (a) are guided or focused within…
atmospheric noiseRadio noise caused by natural atmospheric processes, primarily lightning discharges in thunderstorms.
AtomA particle of matter indivisible by chemical means. It is the fundamental building block of elements.
atomicRefers to an operation that is never interrupted or left in an incomplete state under any circumstance.
atomic operationWhen Democritus gave the word "atom" to the indivisible bits of matter, he meant literally something that could not be cut: a- (not) + tomos (cuttable).
AtroposOne of the CPU schedulers provided by Xen. Atropos provides domains with absolute shares of the CPU, with timeliness guarantees and a mechanism for…
attachTo store a file with a Lotus Notes document or form. The file, or attachment, is stored with the document or form in the application until one of them is…
AttachmentTaking a person's property to satisfy a courtordered debt.
attachment unit interface (AUI)In a local area network, the interface between the medium access unit (MAU) and the data terminal equipment within a data station.
AttachmentsAny file type associated with or attached to an e-mail.
attackAn attempt to violate computer security. Note: An example of an attack is malicious logic. [2382-pt.8] 2.
Attack Assessment (AA)An evaluation of information to determine the potential or actual nature and objectives of an attack for the purpose of providing information for timely…
Attack CharacterizationThe process by which the parameters of an attack in progress are developed, updated and defined.
Attack Operations (Counterforce)Attack operations prevent launch of theater missiles by attacking all elements of the overall enemy system, including such actions as destroying launch…
Attack PriceA concept used to evaluate the performance of a BMD system that defines price as the number of Re-entry Vehicles required to ensure target destruction.
Attack SignatureA specific sequence of events indicative of an unauthorized access attempt.
attack timeThe time between (a) the instant that a signal at the input of a device or circuit exceeds the activation threshold of the device or circuit and (b) the…
Attack Warning/ Attack Assessment (AW/AA)Integrated air, missile, and space defense data used to determine whether an attack is underway and, if so, what is the type and strength of the attack.
AttemptThe submission of a single set of biometric sample to a biometric system for identification or verification.
attendant access loopA switched circuit that provides an attendant with a manual means for call completion and control.
attendant conferenceA network-provided service feature that allows an attendant to establish a conference connection of three or more users.
attendant positionThe part of a switching system used by an attendant, i.e., an operator, to assist users in call completion and use of special services.
attention characterIn [a] trusted-computing-base (TCB) design, a character entered from a terminal that tells the TCB the user wants a secure communications path from the…
attention signalThe attention signal to be used by AM, FM, and TV broadcast stations to actuate muted receivers for inter-station receipt of emergency cuing announcements…
AttenuationA mechanism for controlling gene expression in prokaryotes that involves premature termination of transcription.
attenuation coefficientThe rate of diminution of average power with respect to distance along a transmission path.
attenuation constantThe real part of the propagation constant in any electromagnetic propagation medium.
attenuation distortionThe difference in loss at specified frequencies relative to the loss at 1004 Hz, unless otherwise specified. [NECA/FCC-5]
attenuation-limited operationThe condition that prevails when attenuation, rather than bandwidth, limits the performance of a communications link.
attenuatorA nucleotide sequence in the 5' region of a prokaryotic gene (or in its RNA ) that causes premature termination of transcription, possibly by forming a…
attractivenessThe property or properties of a location that create an incentive for trips to be made to that location.
attributeAn attribute is a characteristic of data that sets it apart from other data, such as location, length, or type.
Attribute AuthorityAn entity, recognized by the Federal Public Key Infrastructure (PKI) Policy Authority or comparable Agency body as having the authority to verify the…
attribute certificateA set of attributes and a public key certificate identifier that are made unforgeable by use of the digital signature created with a private key.
attribute dataCharacteristic or descriptive information about a geographic feature (points, lines, or areas) stored in either tabular format or relational format.
attribute table / DBMS tableAn INFO or other tabular file containing rows and columns. In ARC/INFO, attribute tables are associated with a class of geographic features, such as wells…
AttributesComponent describing object class properties.
audible ringingAn audible signal (information tone) transmitted to the calling party when the called party is alerted. [T1.401-1988]
audible ringing toneIn telephony, a signal, usually consisting of an audio tone interrupted at a slow repetition rate, provided to a caller to indicate that the called-party…
AudiencesGroups of users, who meet certain criteria, created for targeted distribution of information.
audio channelA means for delivering audio signals from one point to another. An audio waveform submitted to the channel input results in a similar (not necessarily…
Audio CodecThe digital encoding used to represent audio data. [Exchange 2007]
audio dubbing1. In videotape editing, a process or technique employed to (a) enhance (e.g., remove noise from, or introduce some kind of special effect into), (b) add…
audio frameA presentation unit of the audio channel; a group of consecutive audio samples.
audio frequency (AF)The band of frequencies (approximately 20 Hz to 20 kHz) that, when transmitted as acoustic waves, can be heard by the normal human ear.
audio response unit (ARU)A device that provides synthesized voice responses to dual-tone multifrequency signaling input by processing calls based on (a) the call-originator input…
audio-follow-videoA video recording, mixing or switching technique or process in which the audio signal associated with any given video signal is recorded, switched, or…
audiovisual recordsProgram and information motion pictures, still pictures, sound recordings, video recordings, and related documentation.
AuditAn audit is a professional, independent examination of a company's financial statements and accounting documents following generally accepted accounting…
Audit DataChronological record of system activities to enable the reconstruction and examination of the sequence of events and changes in an event.
audit eventAn activity which may cause an audit record to be reported in an audit trail. The POSIX.6/D13.1 option specifies the audit events corresponding to POSIX.
audit event typeA field within an audit record that identifies the activity reported by the record, and defines the required content of the record [POSIX.6].
audit ID>An identifier for the individual user accountable for an audit event [POSIX.6].
audit information>Information recording security events in the system [ECMA138].
audit recordThe discrete unit of data reportable in an audit trail on the occurrence of an audit event [POSIX.6].
audit record fieldA field containing information regarding all entities in a transaction, and indicators of the types of processing performed by those entities. [After X9.
audit recorder function>A function that records the security-relevant messages in a security audit trail [10181-7].
Audit Reduction ToolsPreprocessors designed to reduce the volume of audit records to facilitate manual review.
audit review fileA file created by executing statements included in a computer program for the explicit purpose of providing data for auditing.
Audit TrailIn computer security systems, a chronological record of when users logged in, how long they were engaged in various activities, what they were doing, and…
audit trail analyzer function>A function that checks a security audit trail in order to produce, if appropriate, security alarm messages [10181-7].