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SDSL (Symmetric Digital Subscriber Line) A version of Digital Subscriber Line (DSL), SDSL provides identical upload and download speeds to and from the internet. SDSL is typically used by enterprises that transmit data in both directions, usually between multiple sites.
SIM Card (Subscriber Identity Module) A SIM card is used in GSM mobile phones to identify the user for billing and other services.
SMTP (Simple Mail Transfer Protocol) - The prevalent protocol for the transmission of e-mail on a TCP/IP network. SMTP cannot deliver e-mail directly to an inbox, so it is relied upon only to deliver e-mail to a server. A version of Post Office Protocol (POP) generally handles retrieving e-mail from a server.
SOHO (Small Office Home Office) - A term used to characterize a business run from oneís home, or any business environment with relatively few employees.
Serial A form of data processing that handles data one bit at a time, in a series. Serial processing is common to many computer peripheral devices such as keyboards and mice. Serial processing contrasts with parallel processing, which describes multiple processes happening simultaneously.
Server A server is a computer program that provides on-demand resources to other computers. Also, the term server is used to describe the computer that houses the server program.
Signal compression A technique for transmitting signals in a format that requires less bandwidth than usual.
Slamming The practice of switching long-distance carriers without a customerís permission or knowledge. This frequently occurs during promotional giveaways in which the fine print contains the only mention of the long-distance provider change, or in other service agreements that may or may not be directly related to long-distance service.
Sound Card A computer peripheral device for audio input and output. Sound cards contain the software necessary for audio processing and at least 2 jacks, one for a speaker output and the other for microphone input.
Sound Tube Technology Unique, patented headset technology that channels your voice through a slender metal tube to the headsetís microphone.
Speakerphone A telephone that uses a loudspeaker and an external microphone in addition to, or instead of, a traditional telephone handset. Speakerphones are excellent for simple hands-free conversations by an individual user. More advanced speakerphones, called teleconferencers, may be simultaneously used by dozens of people.
Speech Recognition A software application that understands speech as a means of data input, executes verbal commands, or converts speech into text. Most speech recognition programs are able to understand a limited vocabulary and must be 'trained' over a period of time for uncommon terms, phrases, the userís accent, and vocal inflection. In time, speech recognition is expected to become a much more common computer interface, gradually replacing manual methods (keyboard, mouse, etc.).
Spread Spectrum A radio technology that sends radio signals over multiple channels, changing the transmission and receipt frequency at programmed intervals. This type of spread spectrum is known as frequency-hopping spread spectrum and is the prevalent method used in cordless telephones.
Streaming The real-time transmission of sound, data, or video on the internet. Streaming media is sent as a steady, compressed stream of data that is played as it is received. Streaming media is becoming increasingly useful as a means of obtaining sound and video without time-consuming downloads, and for point-to-point videoconferencing.
Stutter Dialtone A service provided by many phone companies that lets the user know when a message has been left in voice mail. The broken (stutter) tone is heard when you first pick up the handset, and usually lasts for a few seconds before the standard dialtone is restored.
Switch A network device that determines the pathways for a given signal or for data. 1) In telephony, the Public Switched Telephone Network (PSTN) provides circuit-switching based on the data provided by the telephone number dialed and keeps a dedicated connection on that call for the duration of the transmission. 2) IP-based transmissions use packet-switching. This type of switch sends small data packets to their destination over numerous pathways, where they are reassembled.
 
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