Telecom Dictionary - Definitions of terms
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Y
Yagi Antenna -1. A linear end-fire antenna, consisting of three or more half-wave elements (one driven, one reflector, and one or more directors). Note 1: A Yagi antenna offers very high directivity and gain. Note 2: The formal name for a "Yagi antenna" is "Yagi-Uda array." 2. A type of directional antenna system, generally designed for UHF frequencies, which is ideal for receiving most DTV stations. Ranging in size from several inches to many feet, a Yagi Antenna is the most common design for rooftop antennas.
Y-Dimension of Recorded Spot - In facsimile systems, the distance between the centers of adjacent recorded spots on adjacent lines measured perpendicular to the recorded line.
Y-Simension of Scanning Spot - In facsimile systems, the distance between the centers of adjacent scanning spots on adjacent lines measured perpendicular to the scanning line on the object. Note: The numerical value of the Y-dimension of scanning spot depends upon the type of system.
Yellow Alarm - An indication provided to a source device indicating a signal failure condition at a sink device. Synonyms remote alarm indication, yellow alarm signal.
Yellow Alarm Signal - Synonym yellow alarm.
Yellow Pages - 1. A hard copy telephone directory listing of business subscriber names, addresses, and telephone numbers. Note: Yellow pages is associated with the residential subscriber listings in the standard directories distributed by the Bell System before divestiture. 2. An electronic information database that contains business names and their associated network addresses, in the manner of a telephone directory. Note : Electronic yellow pages usually contain additional information, such as office location, phone number, and mailstop.
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