TAILIEUCHUNG - Fiber Optics Illustrated Dictionary - Part 61

The Fiber Optics Illustrated Dictionary - Part 61 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 lines of force lines of magnetic induction The sphere of magnetic influence of a magnet. For example in a basic bar magnet the lines of force can be conceptualized as radiating outward from the poles with no break between the north and south poles. Although diagrams of magnetic lines of force show them as discrete lines in one plane the actual region of influence is three-dimensional. The lines themselves are a descriptive way of conveying the properties of the forces that cause them to crowd each other sideways. Areas where these lines converge as at the poles indicate areas of stronger magnetic force. The direction of the lines can be defined as the direction along the north pole if forces other than the magnetic force were hypothetically neutral. Lines of force can be observed indirectly by sprinkling iron particles over a bar magnet and tapping the surface until they form patterns around the magnet. The lines are not fixed in one position they will change if you sprinkle the filings again but come about through their interaction as each piece behaves as a tiny magnet alternately attracting and repelling near neighbors. Collectively these lines are classed as flux. See flux magnetic field. link n. 1. In its broadest sense a communications circuit or channel. 2. A specific leg in a circuit as between two nodes two networks or two users. In ATM it is more specifically defined as a logical link that is an entity with a specific topological relationship and transport capacity between two specified nodes in different subnetworks. See Ethernet Frame Relay asynchronous transfer mode tunneling. 3. A communications medium over which nodes can communicate at the link layer. 4. A logical link between software entities files or processes as between an icon and an executable program or between an alias and a file directory. See alias. link v. 1. To form a logical relationship between software entities or software and hardware devices. 2. .

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