StaggerThe difference in size between the tires on the left and right side of a car. Because of a tire's makeup, slight variations in circumference result.
Standarda statement that describes an acceptable level of performance, excellence, or attainment in that particular activity.
standard frequency and time signal serviceA radiocommunication service for scientific, technical and other purposes, providing the transmission of specified frequencies, time signals, or both, of…
standard operating conditionsThe set of conditions (e.g., voltage, temperature, humidity, and the like) over which the specified parameters maintain their stated performance rating.
standard optical sourceA reference optical source to which emitting and detecting devices are compared for calibration purposes.
standard telegraph level (STL)The power per individual telegraph channel required to yield the standard composite data level.
standard test signalA single-frequency signal with standardized level used for testing the peak power transmission capability and for measuring the total harmonic distortion…
standard test toneA single-frequency signal with a standardized level generally used for level alignment of single links and of links in tandem.
standardized profile1. A profile that specifies one or more interoperable open systems interconnection stacks that are intended to cover one or more specific functional areas.
StandardsDocuments, established by consensus and approved by a recognized body that provides, for common and repeated use, rules, guidelines, or characteristics…
standards developerAn organization that develops standards and is accredited by its National Body, as appropriate [POSIX.0]
standbyIn computer and communications systems operations, pertaining to a power-saving condition or status of operation of equipment that is ready for use but…
standing waveIn a transmission line, a wave in which the distribution of current, voltage, or field strength is formed by the superposition of two waves propagating in…
standing wave ratio (SWR)The ratio of the amplitude of a standing wave at an anti-node (minimum) to the amplitude at an adjacent node (maximum).
star (*) property1. [The] Bell-La Padula security model rule allowing a subject write access to an object only if the security level of the object dominates the security…
star couplerA passive optical coupler having a number of input and output ports, used in network applications.
start signalA signal that prepares a device to receive data or to perform a function. 2. In start-stop transmission, a signal at the beginning of a character that…
start-dial signalAn on-hook signal indicating customer installation (CI) readiness to receive network outpulsing that is used in conjunction with controlled outpulsing.
start-of-text character (STX)A transmission control character that precedes a text and may be used to terminate the message heading.
start-record signalIn facsimile systems, a signal used for starting the process of converting the electrical signal to an image on the record medium.
start-stop characterA character that includes one start signal at the beginning and one or two stop signals at the end.
start-stop distortionIn start-stop modulation, the ratio of (a) the maximum absolute difference between the actual and the theoretical intervals that separate any significant…
start-stop marginIn start-stop modulation, the maximum amount of overall start-stop distortion that is compatible with correct translation by the start-stop equipment of…
start-stop modulationA method of modulation in which the time of occurrence of the bits within each character, or block of characters, relates to a fixed time frame, but the…
start-up KEKKey-encryption-key held in common by a group of potential communicating entities and used to establish ad hoc tactical networks. [INFOSEC-99]
starting frame delimiterA specified bit pattern that indicates the start of a transmission frame.
StatementA summary of all transactions that occurred over the preceding month and could be associated with a deposit account or a credit card account.
static dataData that are relatively long-lived in comparison to ephemeral data, and which have a longer period of validity.
StationAny one of a series of stakes or points indicating distance from a point of beginning or reference.
station batteryWithin a facility, a separate battery power source that satisfies all significant requirements for dc input power associated with the facility.
station clockIn a station, the principal clock, or alternate clock, that provides the timing reference at the station.
station-to-station basisThe term applied to the basis of toll rate making which contemplates that the message toll service charge (telephone or TWX) covers the use made of all…
statistical multiplexingMultiplexing in which channels are established on a statistical basis; i.e., connections are made according to probability of need.
statistically uniqueA characteristic of a quantity such that, for an n-bit quantity, the probability of two values' repeating is less likely than or equal to the probability…
status field (SF)The bits of a link status signal unit that indicate one of the major signaling link states. [T1.226-1992]
statute mileA unit of distance equal to 1.609 km (0.869 nmi, 5280 ft.).
STDMAbbreviation for statistical time-division multiplexing.
Steady state conditionWhen model input values are nearly constant for a defined period of time.
steady-state throughputThe value to which a throughput measurement converges, as the duration of the observation period increases with statistically constant load on the virtual…
SteganographyThe hiding of information within a more obvious kind of communication. Although not widely used, digital steganography involves the hiding of data inside…
step-by-step (SXS) switching systemAn automatic dial telephone system in which calls are switched by a succession of switches that move a step at a time, from stage to stage, each step…
step-index fiberAn optical fiber with a core having a uniform refractive index.
step-index profileFor an optical fiber, a refractive index profile characterized by a uniform refractive index within the core and a sharp decrease in refractive index at…
steradian (sr)The metric unit of solid angle. See International System of Units.
stereophonic crosstalkAn undesired signal occurring in the main channel from modulation of the stereophonic channel or that occurring in the stereophonic channel from…
stereophonic sound subcarrierA subcarrier within the FM broadcast baseband used for transmitting signals for stereophonic sound reception of the main broadcast program service. [47CFR]
STFSAbbreviation for standard time and frequency signal. See standard time and frequency signal service.
still imageNonmoving visual information, i.e., fixed images, such as graphs, drawings, and pictures.
still videoVideo imagery that is not intended to convey the appearance of movement.
Stimulated EmissionPhysical process by which an excited molecule is induced by incident radiation to emit radiation at an identical frequency and in phase with the incident…
STLAbbreviation for standard telegraph level, studio-to-transmitter link.
stop signalIn start-stop transmission, a signal at the end of a character that prepares the receiving device for the reception of a subsequent character.
stop-record signalIn facsimile systems, a signal used for stopping the process of converting the electrical signal to an image on the record medium.
stopbandA band of frequencies, between specified limits, that a circuit, such as a filter or telephone circuit, does not transmit.
StorageThe retention of water or delay of runoff either by planned operation, as in a reservoir, or by temporary filling of overflow areas, as in the progression…
storage cellAn addressable storage unit. 2. The smallest subdivision of storage into which a unit of data can be entered, stored, and retrieved.
Storage ElementA physical grid component that is a storage component, such as a disk or array. See also: Grid Component
storage object1. An object supporting both read and write accesses to an information system (IS). [INFOSEC-99] 2.
store-and-forward (S-F)Pertaining to communications systems in which messages are received at intermediate routing points and recorded i.e., stored, and then transmitted, i.e.
stored-program computerA computer that (a) is controlled by internally stored instructions, (b) can synthesize and store instructions, and (c) can subsequently execute those…
stratumThe number of a clock (in a hierarchical synchronization distribution system) that defines the quality of the clock by specifying parameters such as…
stray currentElectrical current through a path other than the intended path.
streamingAmazon EMR: A utility that comes with Hadoop that enables you to develop MapReduce executables in languages other than Java.
streaming mediaaudio-visual content that is played as it is being downloaded. Thus, an Internet user could begin watching a video clip as the footage downloads rather…
streaming tape driveA magnetic tape unit capable of recording from, and dumping to, another storage medium without stopping at interblock gaps.
streaming tape recordingA method of recording on magnetic tape, which method maintains continuous tape motion without the requirement to start and stop within the interrecord gap.
strength memberAny component of a communication cable, metallic or optical, the function of which is to protect the transport medium, i.e.
strength of mechanism1. A measure of the effectiveness of a security mechanism to prevent a breach of the System Security policy, assuming it has been correctly implemented…
stressed environmentIn radiocommunications, an environment that is under the influence of extrinsic factors that degrade communications integrity, such as when (a) the benign…
stringA series of alphanumeric characters of any length enclosed by quotes.
strokeIn medicine, a loss of blood flow to part of the brain, which damages brain tissue.
stroke edgeIn character recognition, the line of discontinuity between a side of a stroke and the background, obtained by averaging, over the length of the stroke…
stroke speedIn facsimile systems, the rate at which a fixed line perpendicular to the direction of scanning is crossed in one direction by a scanning or recording…