- 産業: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
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ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
A user interface (usually graphical) to hypertext information on the World Wide Web.
Industry:Telecommunications
A usually two-element lens that is corrected to bring two specified or distinct wavelengths to a common focal point. Note 1: The term "achromatic" literally means "without color. " This is not strictly true, however. Early lenses consisted of only a single element, and therefore could bring only a single wavelength to a given focal point; i.e., they suffered from what is termed "chromatic aberration. " The invention of lenses with two elements meant that two distinct wavelengths could be brought to a common focus. This represented a vast improvement over the single-element lens; hence the designation "achromat (ic. )" Note 2: The residual chromatic aberration manifested in the image produced by an achromat (and other multi-element lenses) is usually referred to as the "secondary spectrum. " Synonyms achromatic doublet, achromatic lens.
Industry:Telecommunications
A usually weatherproof encasement, commonly made of tough plastic, that envelops the exposed area between spliced cables, i.e., where the jackets have been removed to expose the individual transmission media, optical or metallic, to be joined. Note 1: The closure usually contains some device or means to maintain continuity of the tensile strength members of the cables involved, and also may maintain electrical continuity of metallic armor, and/or provide external connectivity to such armor for electrical grounding. Note 2: In the case of fiber optic cables, it also contains a splice organizer to facilitate the splicing process and protect the exposed fibers from mechanical damage. Note 3: In addition to the seals at its seams and points of cable entry, the splice closure may be filled with an encapsulant to further retard the entry of water. Synonym yyclosure.
Industry:Telecommunications
A valid frame that cannot be processed. The frame itself is perfectly legitimate. Its unexpected character is defined by two conditions: the specific type of frame and the state of the receiver. The layer-2 protocol states define the proper sequence in which frames are expected to occur. The receiver will compare received frames with its own protocol state to determine whether or not a valid frame is unexpected.
Industry:Telecommunications
A value for measured blocking above which there is a statistically significant probability that the design blocking objective is not being met.
Industry:Telecommunications
A variable used in searches and comparisons (usually signified by an asterisk "*") to denote that any value may be returned. Note: For example, a search of a database for the character string "fire*" could return "firewall," "fire station," "firebug," etc.
Industry:Telecommunications
A variable-duration window that allows a sender to transmit a specified number of data units before an acknowledgement is received or before a specified event occurs. Note: An example of a sliding window in packet transmission is one in which, after the sender fails to receive an acknowledgement for the first transmitted packet, the sender "slides" the window, i.e., resets the window, and sends a second packet. This process is repeated for the specified number of times before the sender interrupts transmission. Synonym acknowledgement delay period.
Industry:Telecommunications
A variation of the refractive index of a material caused by interaction with acoustic energy in the form of a wave or pulse. Note: The acousto-optic effect is used in devices that modulate or deflect light.
Industry:Telecommunications
A variety of computer in which the electronic circuits (which process data serially) are replaced by faster and more powerful photonic circuits (which can perform parallel processing. )
Industry:Telecommunications
A variety of encryption that completely hides text or graphics, usually unencrypted, within other text or graphics that are electronically transmitted.
Industry:Telecommunications
