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Re: OTDR Reflections

    There is no standard for loss as far as fiber and equipement is concerned. It varies by manufactuer, but rule of thumb is is anywhere from.35-.50 per km in both the 1310 and 1550 wavelengths on fiber. Usually equipment manufacters want .5 or less insertion loss on power, and -40 or less(-50 being less) on back reflection. I am drawing a blank on ORL. 
    It sounds as if you are starting your launch three panels deep before you reach the osp panel, as well as trying to read the entire span. To start, set your otdr to km, and then to the lowest setting for distance. If you have a launch box use it, if not a 30m jumper will work just as good. Get your insertion loss and back reflection for all panels seperated from each other.
 Get your readings from the osp panel, and then test the total span seperate from the ty panels. After that do an end to end test and get loss for 1310 1550 as well as your orl. Most manufactures want these readings for their equipment for anything above 5g.
 Connector wise, if they are old APC you will get higher loss at your launch than you will get with UPC,  but if they are newer I would not be concerened. If they are old UPC back, reflection will be the issue, so make sure the boots are blue in color as they are the newer standard and will give you better back reflection.
 Are you required to do Chromatic dispertion and PMD?
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Posted in reply to: OTDR Reflections by DanO1
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