fadingIn a received signal, the variation (with time) of the amplitude or relative phase, or both, of one or more of the frequency components of the signal.
fading distributionThe probability distribution that signal fading will exceed a given value relative to a specified reference level.
fail safeOf a device, the capability to fail without detriment to other devices or danger to personnel. 2.
fail soft[The] selective termination of affected nonessential processing, when hardware or software failure is determined to be imminent. [INFOSEC-99]
fail-safe operationOperation that ensures that a failure of equipment, process, or system does not propagate beyond the immediate environs of the failing entity. 2.
failbackIn a failover cluster or server cluster, the process of returning a clustered service or application to its preferred node after the node has failed and…
failback policyA set of parameters that an administrator can set for a failover cluster or server cluster that affect failback operations.
failedA state that applies to a resource or a node in a failover cluster or server cluster.
failed filerThe filer in a clustered pair that has ceased operating. It remains the failed filer until giveback succeeds. See also "takeover."
failoverA cluster's ability to redirect requests from one server to another. Failover occurs when a user tries to access an application on an unavailable server…
failover clusterA group of computers, known as nodes, or terminal servers working together as a single system to ensure that mission-critical applications and resources…
Failover Cluster Management snap-inA Microsoft Management Console snap-in (graphical user interface) through which you can configure a failover cluster and its nodes, its clustered services…
FailureAn incident resulting in the uncontrolled release of water from a dam. Destroyed and made useless, ceases to function as a dam.
failure access[An] Unauthorized access to data resulting from a hardware or software failure. [INFOSEC-99]
failure control[The methods] used to detect imminent hardware or software failure and provide fail safe or fail soft recovery. [INFOSEC-99]
Failure to Acquire (FTA)Failure of a biometric system to capture and/or extract usable information from a biometric sample.
Failure to Enroll (FTE)Failure of a biometric system to form a proper enrollment reference for an end user.
fair queuingThe controlling of congestion in gateways by restricting every host to an equal share of gateway bandwidth.
Fair UseThe stated exceptions of allowed usage of work under copyright without requiring permission of the original copyright holder.
FairingStructure to protect the payload during ascent phase.
Fake Copy ListingsSometimes a malicious company will steal a web page or the entire contents of a web site, re-publish at a different URL and register with one or more…
fake sectorIn information assurance, a sector consisting of a header but no data, used in large numbers on a diskette to cause an unauthorized copying program to…
fall timeThe time required for the amplitude of a pulse to decrease (fall) from a specified value (usually 90 percent of the peak value exclusive of overshoot or…
fallback actionThe action that an Exchange Server 2007 transport rule takes if a disclaimer cannot be applied to an e-mail message as, for example, when a message is…
falseIn Perl, any value that would look like "" or "0" if evaluated in a string context.
False AcceptanceWhen a biometric system incorrectly identifies an individual or incorrectly verifies an impostor against a claimed identity
False Acceptance RateThe probability that a biometric system will incorrectly identify an individual or will fail to reject an impostor.
False Acceptance Rate (FAR)A statistic used to measure biometric performance when operating in the verification task.
False Alarm Rate (FAR)A statistic used to measure biometric performance when operating in the open-set identification (sometimes referred to as watchlist) task.
false clockA condition where a phase-locked loop controlling a clock locks on a frequency other than the correct frequency.
False DropA web page retrieved from a search engine or directory which is not relevant to the query used.
false lockA condition where a phase-locked loop locks to a frequency other than the correct one, or to an improper phase.
False Match RateA statistic used to measure biometric performance when. Similar to the False Acceptance Rate (FAR).
False Match Rate (FMR)Alternative to False Acceptance Rate. Used to avoid confusion in applications that reject the claimant if their biometric data matches that of an…
False Non Match Rate (FNMR)Alternative to False Rejection Rate. Used to avoid confusion in applications that reject the claimant if their biometric data matches that of an applicant.
False Non-Match RateA statistic used to measure biometric performance. Similar to the False Reject Rate (FRR), except the FRR includes the Failure To Acquire error rate and…
false positivetest result that states that an analyte is present, when, in fact, it is not present or, is present in an amount less than a threshold or designated…
False positivesWhen a search returns results that do not contain what was searched for.
False RejectionWhen a biometric system fails to identify an applicant or fails to verify the legitimate claimed identity of an applicant.
False Rejection Rate (FRR)The probability that a biometric system will fail to identify an applicant, or verify the legitimate claimed identity of an applicant.
FAQ fileAbbreviation for Frequently Asked Questions file. An online file that contains frequently asked questions with answers provided to assist new users and…
far-end block error (FEBE)An indication returned to a transmitting node (source) that an errored block has been detected at the receiving node (sink). [T1.105-1988]
far-end crosstalkCrosstalk that is propagated in a disturbed channel in the same direction as the propagation of a signal in the disturbing channel.
far-end customer interfaceAn associated, loop signaling, customer installation located at the far end of the network transmission path from the network interface (NI) described in…
far-end receive failure (FERF)An indication returned to a transmitting link terminating equipment (LTE) upon receipt of a line AIS (alarm indication signal) code or detection of an…
far-field diffraction patternThe diffraction pattern of a source (such as an LED, ILD, or the output end of an optical fiber) observed at an infinite distance from the source.
far-field regionThe region where the angular field distribution is essentially independent of distance from the source.
Faraday effectA magneto-optic effect in which the polarization plane of an electromagnetic wave is rotated under the influence of a magnetic field parallel to the…
FAT(1) First Article Testing. (2) Factory Acceptance Test.
fat clientA client-centric computing model where software must be installed on each client in a network.
fatal errorA fatal error occurs in the SAX parser when a document is not well formed or otherwise cannot be processed. See also error, warning.
Fault"Fault" means adultery, alcohol abuse, drug abuse, physical abuse, domestic violence, abandonment or reckless spending.
fault managementIn network management, the set of functions that (a) detect, isolate, and correct malfunctions in a telecommunications network, (b) compensate for…
fault protection subsystemIn a facility power distribution system, the subsystem that provides a direct path from each power sink to the earth electrode subsystem.
Fault-ToleranceThe ability of a processor to maintain mission effectiveness after some subsystems failed.
FaviconFavorites Icon is a small icon which appears next to URLs in a web browser. Upload an image named favicon.
FAXShort for facsimile. A process of transmitting documents by scanning them to digital, converting to analog, transmitting over phone lines and reversing…
FCA product of hydrolysis of an IgG antibody, consisting of parts of the constant regions of two heavy chains held together by a disulphide bridge, but…
FC (Fibre Channel)A high-speed network technology typically used to build Storage Area Networks (SAN).
FC-ALFibre Channel-Arbitrated Loop. A type of Fibre Channel network in which devices are connected in a loop topology.
FC-GSFiber Channel Generic Services. An ANSI standard that specifies various Fibre Channel services.