TAILIEUCHUNG - Fiber Optics Illustrated Dictionary - Part 60

The Fiber Optics Illustrated Dictionary - Part 60 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary batteries TIS 96-2528 - 1985 refers to Leclanché-type cells. LECS LAN Emulation Configuration Server. A LAN software server that maintains configuration information that enables network administrators to control which physical LANs are combined to form VLANs. See LEC. LED See light-emitting diode. left-hand circular polarization LHCP. A polarization orientation associated with antennas for example satellite antennas. Left-hand refers to a counterclockwise direction. The left or right sense of the polarization is dependant upon various factors including the transmitter type and transmission frequency. Some systems can be switched from right-to left-hand and may benefit from this flexibility. Left or right orientations are also relevant to other types of polarization besides circular polarization as in left-or right-hand slant polarization. left-hand rule Ampere s rule Ahandy memory aid once widely used to determine an axis of rotation or direction of magnetic flow in a current. It originally came from Ampere s description of a person swimming in the same direction as the current in a wire . When the swimmer looks left it s the same direction that the north-seeking end of a compass will point if it is in the vicinity of the current-carrying wire. Since then it was decided it was easier to use the left hand and actually look at the thumb and fingers rather than imagining a swimmer. Extend the thumb and fingers of the left hand so that the fingers are held together and point straight in one direction with the thumb at a right angle to the fingers in an L shape. Now curl the fingers around a conductive wire so that the thumb points in the direction of the current. The direction of the curled fingers is said to indicate the direction of the magnetic field associated with the current. Some of the confusion associated with left- and righthand rules stems from the fact that pioneer physicists did not originally know in which direction .

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