An Optical Time Domain Reflectometer (OTDR) is a testing and troubleshooting device used to evaluate a fiber optic cable's performance, including optical loss, chromatic dispersion, and attenuation. OTDRs are used to determine the location(s) of events on the cable, including faults, reflectors, and splices. A smart OTDR does at least one of three things: adjusts its test power to match the power at the test point, has an auto-ranging function so the operator does not have to enter the optical power at the test point, or can store the optical power at multiple points on the cable, so the operator can then retrieve and compare those values.
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