considered noise or interference and is expressed in decibels. 2. Waveguides – A structure that guides electromagnetic waves along their length. The core fiber in an optical-fiber cable is an optical waveguide. 3. FTTH – (fiber-to-the-home): Fiber reaches the boundary of the living space‚ such as a box on the outside wall of a home. Passive optical networks and point-to-point Ethernet are architectures that deliver triple-play services over FTTH networks directly from an operator’s central office. 4. Simplex
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The horizons of optical networks are much more than high speed physical layer transport. An intelligent optical network design must include higher network layer considerations. This is the only book currently on the market that addresses optical networks from the physical layer to the network layer and should be valuable for those who try to understand the intricacies of what optical networks can be. —Vincent Chan‚ Professor‚ MIT Department of Electrical Engineering and Computer Science This book
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predates optical fiber and has its roots in wartime efforts to develop secure communication systems that did not require cable and could withstand radio jamming. FSO has been around for more than a decade‚ but it is only recently that interest in this technology has started to grow. Free Space Optics (FSO) communications‚ also called Free Space Photonics (FSP) or Optical Wireless‚ refers to the transmission of modulated visible or infrared (IR) beams through the atmosphere to obtain optical communications
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ADVANTAGES OF OPTICAL FIBERS V. DIGITAL ENCODING VI. TRANS-OCEANIC CABLES VII. CONCLUSION ABSTRACT The fiber-optic communication theory has been around us for years. In the last decades‚ this theory has changed the world of communications making possible to send messages over great distances in matter of fractions of a second by using the technology of transmitting digital signals over a simple optical fiber. These
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Technology Devices to Overcome the Limitations of Sight and Hearing Humans have sight and hearing limitation. Without any devices‚ our sight and hearing was limited. Most of the limitation of sight can be overcome with the help of certain optical instruments such as magnifying glass‚ microscope‚ binoculars and others. The range of frequency of hearing in human 20 Hz to 20 000 Hz. It was different according to the age of a person. Hearing limitations can be overcome by using devices such as
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surrounded by a twisted braid‚ foil or both and bound in a single plastic sheath containing balanced twisted-pair conductors that are individually shielded. Fiber-optic Cable- is a cable made up of optical fibers that can transmit large amounts of information at the speed of light. Dark Fiber- is an unused optical fiber available for use in fiber-optic communication. Coaxial Cable- a cable that consists of a center wire surrounded by insulation and then a grounded shield of braided wire. Plenum- a compartment
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RAM RAM is an acronym for Random Access Memory that is also known as volatile memory‚ because the data it holds is lost when the desktop PC or laptop/notebook computer using it is switched off. Briefly‚ RAM memory is used by the system to store data in the form of files for processing by a computer’s central processing unit (CPU)‚ also known as the processor. The amount of RAM memory used in modern desktop and laptop computers is expressed in megabytes (MB) and gigabytes(GB). A gigabyte (1GB)
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unit 4 for NT 1310Cabling -Definitions 1. Horizontal cable: The wiring/cabling between the telecommunications outlet/connector and the horizontal cross-connect. 2. Backbone Cable: Backbone Cabling is the inter-building and intra-building cable connections in structured cabling between entrances. 3. Patch Cords: Insulated cord with a plug at each end‚ for use with a patch panel. 4. Connectors: Cable connectors are devices for keeping two parts of an electric circuit in contact. 5
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Rathus‚ SA. (2007). Psychology: Concepts and Connections. (8th edition). Belmont‚ California: Wadsworth Publishing. Eysenck‚MW‚ (200). Simply Psychology. (2nd edition). East Sussex‚ England: Psychology Press Ltd. Fox‚ K. (2010‚ January 9). Psychology: Optical Illusions. (Online(. http://www.keele.ac.uk/depts/aa/widening/uniworld/webclub/rs/optical.htm
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multiplexing) operates. WDM is multiplexing several optical signals on a single fibre by using wavelengths which are essentially colours of the laser light; to transmit different signals ranging from 2.5Gbps to 40Gbps. The device that connects the signals together is a multiplexor‚ and the one that splits them apart on the other end is called a demultiplexer. The theory behind WDM is that it allows you to transmit and receive information through different optical channels which is called WDM. This includes
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