Fiber Optic Connector Assembly

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Physical Networking Unit 8 Lab 1 Fiber Optic Connector Assembly The following points outline some special precautions which are specific to fibre optic cable installation and therefore worth highlighting: Fibre Stress: The fibres in the cable should not be subject to any undue stress. This means that if the cable is to be pulled into a long duct route then the specialized equipment and procedures detailed in the next section should be used. As well, if the cable runs vertically for a significant length (more than 10 m) then loops should be inserted every 10m or so. Bend Radius: The cable manufacturer's minimum bend radius should be observed. i.e. there should be no bends tighter than specified either during installation or once the cable has been fixed. A rule of thumb for MBR is 12x cable diameter. Cable Ties: If cable ties are used (particularly on tight jacketed cables), then it is very important that they are not over-tightened, thereby causing localized bending and fibre stress. Spare Cable: At least 5m of cable should be left at each end to allow testing, positioning of enclosures, spare fibre for repairs etc. Where appropriate, spare loops of cable should be included along the cable run to assist repair in case of accidental damage. Labeling: All cables and cable ends should be labeled clearly in accordance with the specification. Cable End Protection: Where cable ends are to be left exposed then they should be sealed with heat shrink caps to prevent ingress of dirt or moisture. Earthing: In many circumstances completely non-metallic fibre optic cables can be used to eliminate all earthing problems. If metallic elements are present then they should be earthed in accordance with the installation specification. Generally this will involve bonding metallic strength members or moisture barriers to earth at one end only of the cable run. Reference

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