GIGABIT-CAPABLE PASSIVE OPTICAL NETWORK SYSTEM

摘要

PURPOSE: An ONT(Optical Network Terminal), an OLT(Optical Line Terminal) and GPON(Gigabit Passive Optical Network) comprising these are provided to apply variably generated delay time generated with the variable in bit unit by data bus size by UL/DL transmission rate and by clock frequency to distance measurement thereby exactly measuring distance of ONTs in bit unit. CONSTITUTION: A DL(DownLink) frame demultiplexer(413) extracts a distance measurement request message by inverse multiplexing of a downward frame. An UL(UpLink) transmission controller(414) controls transmission time of an UL frame by calculation of time for start bit search time of the downward frame and UL/DL clock deviation. An UL frame multiplexer](415) performs delayed output of upward frame as time of calculated byte unit. A bit unit delay unit(416) performs delay output of the upward frame as time of calculated residual bit unit.