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In a 10-Gigabit-capable Passive Optical Network (XGPON) system, a power management function such as cyclic sleep mode can be implemented to increase energy efficiency of an Optical Network Terminal (ONT). To optimize power saving with the cyclic sleep mode, the authors proposed an analytic model to determine required ONT buffer size for incoming traffics from User Network Interface (UNI) when the ONT is sleeping, and to evaluate performances such as power consumption and delay, in accordance with buffer sizes, sleep periods, and arrival rates. Then, by simulating the proposed model, they could estimate the required buffer size and the sleep period for effective implementation of the cyclic sleep mode.
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