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See F region.
- Browse Related Terms: absorption, absorption band, absorption index, Absorptivity, F layer, material absorption, path loss, phonon absorption, Photoelectric Effect, photovoltaic effect, sudden ionospheric disturbance (SID)
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- That portion of the ionosphere existing between approximately 160 and 400 km above the surface of the Earth, consisting of layers of increased free-electron density caused by the ionizing effect of solar radiation. Note 1: The F region reflects normal-incident frequencies at or below the critical frequency (approximately 10 MHz) and partially absorbs waves of higher frequency. Note 2: The F1 layer exists from about 160 to 250 km above the surface of the Earth and only during daylight hours. Though fairly regular in its characteristics, it is not observable everywhere or on all days. The principal reflecting layer during the summer for paths of 2,000 to 3,500 km is the F1 layer. The F1 layer has approximately 5 ÃÂ 105 e/cm3 (free electrons per cubic centimeter) at noontime and minimum sunspot activity, and increases to roughly 2 ÃÂ 106 e/cm3 during maximum sunspot activity. The density falls off to below 104 e/cm3 at night. Note 3: The F1 layer merges into the F2 layer at night. Note 4: The F2 layer exists from about 250 to 400 km above the surface of the Earth. The F2 layer is the principal reflecting layer for HF communications during both day and night. The horizon-limited distance for one-hop F2 propagation is usually around 4,000 km. The F2 layer has about 106 e/cm3. However, variations are usually large, irregular, and particularly pronounced during magnetic storms.
- Browse Related Terms: F Region, flutter, meteor burst communications, near-vertical-incidence skywave, power margin, propagation mode, radio fadeout, reflecting layer, reflecting loss, reflection, skip distance, skip zone, sky wave, Sporadic E, traveling wave, tropospheric scatter, tropospheric wave
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(1) Field Artillery. (2) Feasibility Assessment.
- Browse Related Terms: Brassboard Configuration, Breadboard Configuration, FA, METO, METOIA, TFD
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Functional Analysis/Requirements Definition.
- Browse Related Terms: Budget Estimate Submit (BES), CAESAR, CMRS, Engagement Surveillance, FA/RD, HRSA, IRRS, Manpower Authorizations, MRDA, Programming, QQPRI, RCM, RDD, RDD-100, Rqmt, RQMTS, SRA, TSR
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Forward Area Air Defense (US Army).
- Browse Related Terms: AD, ADCATT, ADDA, ADDS, ADI, ADIZ, ADSG, ADSI, ADX, CADCI, DADS, FAAD, FAADS, HIMAD, IAD, IADS, JADO, LAAD, LADL, MADS, NADGE, NATINAD, PVO (PVO Strany ), SAGE, SHORAD, TADS, Theater High Altitude Area Defense System (THAAD), Traverse Level, USAADASCH
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Forward Area Air Defense Command, Control and Intelligence.
- Browse Related Terms: AFC 2 S, AFC2S, AGCCS, Airspace Control in the Combat Zone, Airspace Control Plan, Ballistic Missile Defense (BMD) Cell, Command and Control (C 2 ), FAAD C2I, MACCS, MTACCS, National Military Command Center (NMCC), Point Defense, TACCS, TACCSF, Tactical Air Operations Center, Tactical Area of Responsibility (TAOR), TAD C2, Weapons Control
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Forward Area Air Defense System (JCS term).
- Browse Related Terms: AD, ADCATT, ADDA, ADDS, ADI, ADIZ, ADSG, ADSI, ADX, CADCI, DADS, FAAD, FAADS, HIMAD, IAD, IADS, JADO, LAAD, LADL, MADS, NADGE, NATINAD, PVO (PVO Strany ), SAGE, SHORAD, TADS, Theater High Altitude Area Defense System (THAAD), Traverse Level, USAADASCH
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Fleet/Force Anti-Air Warfare Commander.
- Browse Related Terms: AAFCE, AF, AF SATCOM, AF/IN, AFAC, AFAE, AFAM, AFCC, AFOSH, AFPEO/SP, AFSARC, AFSATCOM, AFSB, AFSC, AFSCN, AFSSI, AFWAN, AFWL, AMOS, ASAF, ASAF (A), ATAF, CENTAF, CMAFB, COMAFFOR, Common Integration and Tasks Execution (CITE), Communications System Segment (CSS), CSAF, FAAWC, LAAFB, MAGTF, Navy FAAWC, PACAF, RAAF, RNLAF, SPO, TAF, TPWG, USAF, USAFE, USCENTAF, USPACAF, VAFB, WR/VAFB
All > Technology > Storage
A Fibre Channel (or iSCSI) topology with at least one switch present on the network.
The hardware that connects workstations and servers to storage devices in a networked storage architecture.
- Browse Related Terms: Arbitrated loop, auto-terminatation, EMRL (Embedded RAID Logic), Fabric, FC, FC (Fibre Channel), FC-AL, FC-GS, FCIA, Fiber Channel Generic Services (FCGS), Fibre Channel Industry Association (FCIA), Fibre Channel-Arbitrated Loop (FCAL), SAN, Storage Area Network (SAN), Storage director
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All > Technology > Security > Biometrics
A biometric modality that uses an image of the visible physical structure of an individual's face for recognition purposes.
- Browse Related Terms: Behavioral Biometric Characteristic, Biological Biometric Characteristic, Biometrics, Face Recognition, Gait, Hand Geometry Recognition, Iris Recognition, Keystroke Dynamics, Palm Print Recognition, Signature Dynamics, Speaker Recognition
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In laser diodes, a phenomenon in which a high field intensity of stimulated optical radiation causes degradation of the facets, i.e., those forming the cavity mirrors, decreasing reflectivity and resulting in a decrease of the internal quantum efficiency and an increase in the threshold current.
- Browse Related Terms: active laser medium, facet erosion, optical disk, Raman scattering, spontaneous emission, Stimulated Emission, superluminescent LED, superradiance, threshold current
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A fixed, mobile, or transportable structure, including (a) all installed electrical and electronic wiring, cabling, and equipment and (b) all supporting structures, such as utility, ground network, and electrical supporting structures. 2. A network-provided service to users or the network operating administration. 3. A transmission pathway and associated equipment. 4. In a protocol applicable to a data unit, such as a block or frame, an additional item of information or a constraint encoded within the protocol to provide the required control. 5. A real property entity consisting of one or more of the following: a building, a structure, a utility system, pavement, and underlying land. [JP1]
- Browse Related Terms: aggregator, automatic ringdown circuit, B channel, Block Holder, compatibility testing, exchange access, facility, maintenance, MJU, network administration, number portability, open video systems, pair-gain system, point code (PC), positioned interface structure, second dialtone, service bit, service integrity, service signals, service-provider portability, system services API, terminal service profile (TSP), Toll Free Service End-User Subscriber, verified off-hook
All > Technology > GIS
Manmade construction. For example, resources describing buildings, fences, and related items.
- Browse Related Terms: Business and Economic Development, Capacity, Cultural and Society, Demographic, Education, Elevation, Facility and Structure, Health, Historic, Integrated Services Digital Network (ISDN), Location, Planning, Land Use, and Zoning, Police District, Property and Land, Public Safety, Public Services
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A group of interconnected equipment and transmission media uniquely identified and dedicated to a specific type of service. [T1.238-1994/97]
- Browse Related Terms: access provider, card session, facility assembly, fixed access, multimedia communication system, NIC, non-fixed access, PCS application, PCS session, PCS switching center, Personal Communications Service, point of access, protection switching (PS), record, seizing
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A two-digit code (FC) used in the exchange-carrier-to-interexchange carrier (EC-to-IC) facility/service selective signaling protocol and the IC-to-EC facility/service selective signaling protocol that identifies the type of facility requested. [T1.104-1991]
- Browse Related Terms: acceptance limit (AL), access service area, exchange carrier (EC), facility code, other common carrier (OCC), point of presence (POP), point of termination (POT), public switched network (PSN), service code, specialized common carrier (SCC), switched exchange access network, tariff, teletext, viewdata, wireline common carrier