Thursday Apr 17, 2014
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S

Word Explanation
S

Smile

S-MIME

(Secure MIME). A public-key encryption protocol for MIME (Multipurpose Internet Mail Extensions) attachments to electronic mail messages.

S-OFDMA: Scalable Orthogonal Frequency D

Scalable Orthogonal Frequency Division Multiple Access (SOFDMA or S-OFDMA) is a flavor of the Orthogonal Frequency Division Multiplexing (OFDM), which is a technique for transmitting large amounts of digital data over a radio wave.

S-Video

Short for Super Video. A high-quality method of transmitting video signals over cable to a television from a device such as a Camcorder VCR or game machine. S-Video separates information into two signals: Chrominance (separates color information) and Luminance (brightness). This prevents color bleeding and dot crawl, and increases clarity and sharpness. Once the information is finally delivered to the TV it is done so as a single signal over one wire. S-Video requires an S-Video input jack on the television receiving video information, support for S-Video output on the device sending signals, and a special S-Video cable.

S/I: Signal-to-interference ratio

Signal-to-interference ratio (S/I) is the ratio of power in a signal to the interference power in the channel. The term is usually applied to lower frequency signals, such as voice waveforms, but can also be used to describe the carrier wave. See also carrier-to-interference ratio.

S/N ratio

Signal-to-Noise Ratio. The amount of communication signal in relation to the amount of interference, or noise, on the medium. It is usually expressed in decibels.

S/N: Signal-To-Noise Ratio

Signal-To-Noise Ratio (S/N) is a measure of the power of a signal versus noise. A higher ratio means that there is more signal relative to noise.

s/w

Software; the programs that tell a computer what to do. Hardware is the physical part of a computer system; the machinery and equipment.

SAA

Systems Application Architecture. A set of interfaces, guidelines, and protocols developed by IBM to encourage the development of software that is consistent regardless of hardware or operating system. SAA governs user interfaces, communications protocols, programming languages, and procedure libraries.

SABP: Service Area Broadcast Protocol

Service Area Broadcast Protocol (SABP) is a 3G UMTS protocol for information broadcasting services, which allows cellular operators to deliver information such as stock prices, traffic information, weather reports and emergency alerts to mobile users within selected cells of the network.

SACCH: Slow Associated Control Channel

Slow Associated Control Channel (SACCH) is a GSM signalling channel that provides a relatively slow signalling connection. The SACCH is associated with either a traffic or dedicated channel. The SACCH can also be used to transfer Short Message Service (SMS) messages if associated with a traffic channel.

SAD

Systems Analysis Definition. The beginning step of systems analysis, in which the end user's requirements are defined in order to get an idea of what kind of system must be designed to meet those needs.

safety-critical system

A system in which safety is critical; a computer or other system which may cause deaths if it fails. An example would be the system that controls an airplane or a network of trains. These systems must be designed to exact specifications, and with extra components in case a component fails.

sag

A temporary drop in voltage; it may cause a problem in the computer.

SAGE

Systems Administrators Guild. A special technical group of the USENIX Association, a body which focuses on research and innovation in UNIX and open systems.

SALT: Speech Application Language Tags

The Speech Application Language Tags (SALT) specification largely overlaps the VoiceXML specification and both are under review by the same W3C working group. Both specifications share some common functionality, but SALT includes multi-modal capabilities for inputting and outputting data, making speech and traditional data I/O more interchangeable.

SAM

Symantec AntiVirus for Macintosh. An antivirus program from Symantec Corporation, Cupertino, California.

sampling

Taking the value of a signal at evenly spaced moments in time. This is the first of three steps in converting an analog signal into a digital one. After sampling, the signals must be quantized, then encoded.

Sampling

Sampling is the process performed in the conversion of analog waveforms to a digital format. It converts a continuous time signal into a discrete time signal or sequence of numbers.

sampling rate

Sampling (taking the value of a signal at evenly spaced moments in time) is one of the steps in converting an analog signal to a digital signal. The sampling rate is the frequency at which samples are taken. The sampling rate has to be twice the rate of the analog frequency that is captured, or more; the higher the sampling rate, the better quality signal.

samurai

A hacker who does legal cracking, for pay.

SAN
San Francisco Project

An IBM project to create a common foundation for developers through object technology-based business applications and Java.

sanity check

A review of a program's code to make sure there are no minor errors (such as entering the wrong character, forgetting to close parentheses, etc.) before checking the more complex logic aspects of the program.

sans serif

Without serifs, which are the short lines at the tops and bottoms of each stroke in a letter. (Sans means without in French). Sans serif typefaces are very simple; all caps sans serif lettering is called block lettering. Some examples of sans serif fonts are Helvetica, Avant Garde, and Oracle. Sans serif type is often used for headlines, signs, and ads.

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