tailieunhanh - Fiber Optics Illustrated Dictionary - Part 24

The Fiber Optics Illustrated Dictionary - Part 24 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 cables since the signal is a lightwave rather than an electrical signal the term might not seem to apply. However two types of problems related to crosstalk are characteristic of optical systems in the real world where installation and structural considerations come into play Some optical systems are hybrid with electrical links or switches as part of the transmission system in which case traditional crosstalk at the electrical interfaces may occur. In optical systems where many small fiber components are tightly bundled creating numerous bends or connective joints a number of types of light signal leakage are possible where there are breaks or weak points in the cladding improperjoints or misalignments in the endfaces enabling light signals from one waveguide to interfere with another resulting in optical crosstalk. Optical crosstalk can be minimized by good coupling and cladding practices and the reduction of reflection around joints and bends. In terms of reducing electrical crosstalk at joints many firms are developing and installing all-optical switching systems and linking components. CRS See cell relay service. CRT See cathode-ray tube. CRTC See Canadian Radio Television and Telecommunications Commission. cryptanalysis The research and analysis of cryptography that is message or data encryption. While cryptanalysis is generally the art and science of a broad range of cypher-related concepts it is also more narrowly understood as the actual analysis and breaking of a cyphered message without foreknowledge of its content structure or any keys that might be needed to discern its contents. cryptochannel A communications channel that is encrypted in someway to provide privacy and security to the conversants. When carried out through a computer network a digitally encrypted mobile communications line or a digital telephone line many means can be used to hide the signal or the contents of the signal. These include key encryption

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