Glossary FrontAccessAccess to fibers and adapters from the front of the rack, where usually a door is located GPON Gigabit-Capable Passive Optical Network HCSHard Clad Silica are optical fibers with a step index profile and with a core made of common mineral glass and the cladding of a special plastic. A known fiber type has a core diameter of 200 µm and a cladding diameter of 230 µm. The fibers are used for short distances and in particular for industrial cabling. HDTVHigh Definition TeleVision – television with high resolution (16:9), 1920 × 1080 pixels IEC International Electrotechnical Commission IEEE Institute of Electrical and Electronics Engineers, Inc. www.ieee.org IP Internet Protocol IPxxDescribes the degree of protection by housings according IEC 60529 (DIN 40050). As pro- tection the immersion of water and particles is specified and digits are assigned to it. The first digit describes the protection of particles with 0 to 6 and the second digit the pro- tection against water with 0 to 8. For example IP67 describes the protection against par- ticles with approx. 50 µm and against water maximal 1m below the surface for 30 minutes. ITU International Telecommunication Union LAN Local Area Network – for the transmission of information between independent terminal units LSFH™Low smoke and free of halogen are characteristics of material behaviour. LSFH™® is a Trademark of HUBER+SUHNER AG. Usually these materials are flame retardant and self-extinguishing, they are made of polyethylene and metalhydroxide additives. Similar abbreviations are LSOH and LSZH. LWLOptical wave guides, also called optical fibres, are dielectric wave guides which transmit light through their cores. The cladding surrounding the core has a lower index of refrac- tion (density) than the core. This causes the light at the interface to be totally reflected and to be carried through the core of the optical wave guide. Optical wave guides are made of mineral glass (quartz glass – pure silicon dioxide) or plastic (especially PMMA), depending on the specific application. The cladding is surrounded by a protective layer to prevent mechanical damage. It is made of special plastic, which also protects the fibre against moisture. Today, optical wave guides are especially applied as a medium for transmitting data through optical fibres, for transmitting power in the field of material processing and in medicine, for lighting and imaging purposes and in metrology. MAN Metropolitan Area Network – Inter-regional network for the transmission of information MPO Multifiber push-on - an optical connector, standardised under IEC 61754-7:2008 (multimode only) which provides an interface for up to 72 fibers in a single unit, utilising individual rows of 12 fibers in a polymeric ferrule. MTP® Mechanical transfer push-pull – an enchanced version of the MPO connector offering higher optical performance, repeatability and reliability MultimodeThat is a fiber whose core diameter compared to the wavelength of the light is big. Typical core diameters are 50 µm (EU standard) and 62.5 µm (US standard). In the core a big number of waves can propagate. As a result of many paths signal interference occurs based on running time differences. Multimode fibers are suitable for data trans- mission over shorter distances. NT Network Termination – network termination with fiber or copper technique NZDSF Non-Zero Dispersion – Shifted Fiber OAN Optical Access Network – access network using optical fibers PEPolyethylene is made of ethene by polymerisation and a thermoplastic. Polyethylene is used for cable jackets, that have a high protection against environmental influences. The material is halogen-free and can be recycled without concern. 222
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