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کامپیوتر و شبکه::
فیبر گرفته شده
Both methods are able to localize failures in feeder fiber and drop fibers without e.g. using expensive tunable OTDRs.
However, since the OTDR pulse cannot by-pass the power splitter, the drop fibers cannot be monitored.
In case the drop fiber is failed, only the connection to the corresponding ONU will be interrupted.
Besides, in the TDM-PON supervision, it is difficult to detect a failure in the drop fiber, because the Rayleigh back-scattered light from different fiber branches overlap with each other in the OTDR trace and cannot be distinguished [26].
Thus, the Rayleigh back scattered light from different drop fibers will not overlap since every fiber branch operates at a different wavelength channel.
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