The outstanding advantage of the PON network is the elimination of outdoor active devices, all of which are done in the switch and in the user's home. Moreover, the initial investment of this access method is small, and most of the funds are deferred until the user actually accesses. Its transmission distance is shorter than that of the active fiber access system, and the coverage range is small, but its cost is low, no need to set up a separate machine room, and maintenance is easy. Therefore, this structure can economically serve home users.
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