signal processingThe processing--such as detection, shaping, converting, coding, and time positioning--of signals, that results in their transformation into other forms…
signal processing gainThe ratio of (a) the signal-to-noise ratio of a processed signal to (b) the signal-to-noise ratio of the unprocessed signal.
signal reference subsystemThe portion of a facility grounding system that (a) provides reference planes, such as ground-return circuits, for all of the signal paths in the facility…
signal regenerationSignal processing that restores a signal so that it conforms to its original characteristics.
signal sampleThe value of a particular characteristic of a signal at a chosen instant.
signal samplingThe process of obtaining a sequence of instantaneous values of a particular signal characteristic, usually at regular time intervals.
signal securityA generic term that includes both communications security and electronics security. [JP 1-02]
signal sequenceA stretch of 15-30 amino acid residues at the N terminus of a protein, which is thought to enable the protein to be secreted (pass through a cell…
signal transduction(SIG-nul trans-DUK-shun) The process by which a cell responds to substances in its environment.
signal transduction inhibitorA drug that may prevent the ability of cancer cells to multiply quickly and invade other tissues.
signal transfer point (STP)In a common-channel signaling network, a switch that provides for the transfer from one signaling link to another.
signal transitionIn the modulation of a carrier, a change from one significant condition to another.
signal unit (SU)A group of bits forming a separately transferable entity used to convey information on a signaling link. [T1.226-1992]
signal unit alignmentThe alignment that exists when flags are received at intervals that correspond to integral numbers of octets and that fall within certain upper and lower…
signal unit error rate monitoringA procedure by which the error rate of an active signaling link is measured on the basis of a count of correctly checking and erroneous signal units. [T1.
signal unit sequence controlProcedures used at Level 2 to ensure that message signal units are transported in sequence, without loss or duplication, over a particular signaling link.
signal-plus-noise-to-noise ratio ((S+N)/N)At a given point in a communications system, the ratio of (a) the power of the desired signal plus the noise to (b) the power of the noise.
signal-return circuitA current-carrying return path from a load back to the signal source, i.e., the low side of the closed loop energy transfer circuit between a source-load…
Signal-to-C-Notched Noise RatioThe term "Signal-to-C-Notched Noise Ratio" denotes the ratio in dB of a test signal to the corresponding C-Notched Noise.
signal-to-crosstalk ratioAt a specified point in a circuit, the ratio of the power of the wanted signal to the power of the unwanted signal from another channel.
Signal-to-Noise RatioA specifically produced response (signal) compared to the response level (noise) when no specific stimulus (activity) is present.
signal-to-noise ratio (SNR)The ratio of the amplitude of the desired signal to the amplitude of noise signals at a given point in time.
signal-to-noise ratio per bitThe ratio given by Eb/N0, where Eb is the signal energy per bit and N0 is the noise energy per hertz of noise bandwidth.
signalingThe use of signals for controlling communications. 2. In a telecommunications network, the information exchange concerning the establishment and control…
signaling channelA data channel in combination with its associated signaling terminal equipment. [T1.226-1992]
signaling connection control part (SCCP)1. A component part of SS7 protocol that provides additional functions to the message transfer part (MTP) to provide for Connectionless and Connection…
signaling data linkA combination of two data channels operating together in a single signaling system. [T1.226-1992]
signaling end pointA signaling point that can send or receive SS7 messages, and has no message transfer function. [T1.235-1993] 2.
signaling information fieldThe bits of a message signal unit that carry information particular to a certain user transaction and always contain a label. [T1.110-1987] [T1.226-1992]
signaling linkA transmission facility that consists of a signaling data link and its transfer control functions, used for reliable transfer of a signaling message.
signaling link blockingAn event that causes the unavailability of a signaling link, typically consisting in a "processor outage" condition at one end of that signaling link. [T1.
signaling link code1. A field with certain signaling network management messages, which indicates the particular signaling link to which the message refers among those…
signaling link failureAn event that causes the unavailability of a signaling link, typically consisting of a failure in signaling terminal equipment or in the signaling data…
signaling link groupA set of signaling links directly connecting two signaling points and having the same physical characteristic (bit rate, propagation delay, and the like).
signaling link management functionOne of a group of functions that control and take actions when required to preserve integrity of locally connected signaling link sets.[T1.226-1992]
signaling link restorationAn event characterizing the completion of the initial alignment procedure on a signaling link following the removal of the previous causes of failure; in…
signaling link selection (SLS)A field of the routing label that is typically used by the message routing function to perform load sharing among different signaling links n, or link…
signaling link selection fieldA field of the routing label that is typically used by the message routing function to perform load sharing among different signaling links or link sets.
signaling link setA set of signaling link(s) directly connecting two signaling points. [T1.110-1987]
signaling message1. An assembly of signaling information pertaining to a call that includes, but is not limited to, management transactions, that is transferred (between…
signaling message discriminationAt a given signaling point, the process that decides, for each incoming message, whether the signaling point is destination point or if it should act as…
signaling message distributionThe process of determining upon receipt of a signaling message at its destination point, to which user part the signaling message is to be delivered. [T1.
signaling message handling functionsFunctions that, at the actual transfer of a message, direct the message to the proper signaling link or user part. [T1.
signaling message routeThe signaling link or consecutive links connected in tandem that are used to convey a signaling message from an originating point to its destination point.
signaling message routingThe process for selecting, for each signaling message to be sent, the signaling link to be used. [T1.110-1987]
signaling networkA network used for signaling by one or more users and consisting of signaling points and connecting signaling links. [T1.110-1987] [T1.226-1992]
signaling network functionsThe functions that are performed by the message transfer part at level 3 and are common to, and independent of, the operation of individual signaling…
signaling network management (SNM) functionsFunctions that control the current message routing and configuration of signaling network facilities based on predetermined data and current information…
signaling pathIn a transmission system, a path used for system control, synchronization, checking, signaling, and service signals used in system management and…
signaling pathway(SIG-nuh-ling â¦) A series of specific actions in a cell in which a signal is passed from one molecule to the next in the series.
signaling pointA node in a signaling network that either originates and receives signaling messages, or transfers signaling messages from one signaling link to another…
signaling point codeA binary code uniquely identifying a signaling point in a signaling network. This code is used, according to its position in the label either as…
signaling routeA predetermined path described by a succession of signaling points that may be traversed by signaling messages directly by a signaling point towards a…
Signaling System No. 7 (SS7)A common-channel signaling system defined by the CCITT in the 1988 Blue Book, in Recommendations Q.771 through Q.774.
signaling time slotIn TDM carrier systems, a time slot starting at a particular phase or instant in each frame and allocated to the transmission of signaling (supervisory…
signaling traffic flow controlActions and procedures intended to limit signaling traffic at its source in the case when the signaling network is not capable of transferring all…
signaling traffic management functionsFunctions that control, and when necessary, modify, routing information used by message routing information to control the transfer of signaling traffic…
SignalsInternal and external factors that control changes in cell structure and function.
signals intelligence (SIGINT)1. A category of intelligence comprising, either individually or in combination, all communications intelligence, electronics intelligence, and foreign…
signals security[A] generic term encompassing communications security and electronic security. [NIS]
signatoryThe entity that generates a digital signature on data. [After X9.31]
signatory authorityIn secure communications, an agreed entity (usually a third party) that issues signatory certificates to organizations participating in this authorization…
signatory certificateIn encryption, a certificate, issued by a signatory authority, that identifies the authorized signatories of an organization. [After X9.45]
Signature CardA card signed by each depositor and customer of a bank which may be used as a means of identification.
Signature CertificateA public key certificate that contains a public key intended for verifying digital signatures rather than encrypting data or performing any other…
Signature DateThe date that a filer or reviewer digitally or electronically signed (eSigned) the financial disclosure report.
Signature DynamicsA behavioral biometric modality that analyzes dynamic characteristics of an individual's signature, such as shape of signature, speed of signing, pen…
SIGNATURE fileA file you copy to the root directory of your storage device. The file contains a job ID, manifest file, and a signature.
Signature GenerationUses a digital signature algorithm and a private key to generate a digital signature on data.
Signature HistoriesA list of observed target signature characteristic parameter values as a function of missile flight time used for target discrimination and kill…
Signature LineA set of 4 - 8 lines of text placed at the end of a mail message to provide the reader with the author's contact information, favorite quote, special of…
signature molecule(SIG-nuh-cher MAH-leh-kyool) A biological molecule found in blood, other body fluids, or tissues that is a sign of a normal or abnormal process, or of a…
Signature VerificationUses a digital signature algorithm and a public key to verify a digital signature.
Signed DataData on which a digital signature is generated.
signet ring cell carcinomaA highly malignant type of cancer typically found in glandular cells that line the digestive organs.
significantIn statistics, describes a mathematical measure of difference between groups. The difference is said to be significant if it is greater than what might be…
significant conditionIn the modulation of a carrier, one of the values of the signal parameter chosen to represent information.
significant digitIn a representation of a number, a digit that is needed for a given purpose; in particular, a digit that must be kept to preserve a given accuracy or a…
Significant FeatureAn exterior architectural component of a building that contributes to its special historic, cultural, and/or aesthetic character, or in the case of an…
Significant hazardA downstream hazard classification for dams in which 1-6 lives are in jeopardy and appreciable economic loss (rural area with notable agriculture…
significant instantIn a signal, any instant at which a significant condition of a signal begins or ends.
significant intervalThe time interval between two consecutive significant instants.
Significant landscape improvementAny landscape improvement which is a character-defining element in its historic district, contributing to the special aesthetic and historic character for…
Significant Wave HeightThe average height of the one-third highest waves of a given wave group.
Significant Weather OutlookA narrative statement produced by the National Weather Service, frequently issued on a routine basis, to provide information regarding the potential of…
signingAn advanced security feature that verifies the sender's identity and verifies that the message hasn't been modified during transit. [Exchange 5.5]