Test Receive Fiber Cable Plant With OTDR Sample Clauses

Test Receive Fiber Cable Plant With OTDR. In fault locating efforts, determining the exact location of the fault is important. This can be accomplished by using an as-built schematic of the cable route and the bare fiber OTDR measurements. The schematic should have all original and maintenance splices with their respective sheath distances and cable sequential meter/feet markings recorded. The accuracy of any distance measurement is a percentage of the actual distance involved. Short distance measurements will be more accurate than those made over long distances. The overall uncertainty in distance measurements can be reduced by locating features relatively close to nearby system "landmarks" (such as known splice points) rather than making absolute measurements from the OTDR location. Other factors that affect distance measurements are the proper fiber refractive index, OTDR launch conditions, and cursor positions. For example, on some fiber faults the glass may have been shattered, causing a poor back reflection on the OTDR trace. This condition makes it difficult to determine the exact fault location due to a lack of a reflective end pulse. If a shattered end is encountered, it is recommended that measurements be made from both ends in order to determine the actual length of fiber damage. For comparison purposes, other fibers in the cable should be tested when this condition exists. After bare fiber distance measurements are made utilizing an OTDR, a calculation must be made to determine the actual sheath distance to the fault point. Due to the effects of the loose coiling of the optical fiber within the protective buffer tube or tubes, the length of the optical fiber in a given section of cable is greater than the length of the cable jacket itself. The correction factor is normally not more than 2% on most fiber cables, and on some of the newer single buffer fiber cables, the correction factor is less than 5%. The correction factor is best determined by calibrating to a known cable sheath length between two splice points and comparing it to the measured fiber length between the same splice points. When this technique is used, most sources of error resulting from the cable design and the OTDR margin of error are compensated for. The equation for calculating the correction factor is as follows: Correction Factor = Cable Length/Fiber Length Cable Length = Fiber Length X Correction Factor Figure 2 is an example of locating a fault using the correction factor: (This figure illustrates the method to ...
Sample 1
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