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In this paper, the author proposes an innovative method for protecting of Passive Optical Networks (PONs), especially the central optical unit - Optical Line Termination (OLT). PON networks are typically used in modern high-speed access networks, but there are also several specific applications, such as in business, army or science sector, which require a complex protection and backup system against failures and malfunctions. A standard tree or star topologies, which are usually used for PON networks, are significantly vulnerable mainly against the malfunctions and failures of OLT unit or feeder optical cable.
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