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Cyclic Sleep Mode (CSM) is a widely studied and standard energy conservation technique for Passive Optical Networks (PONs). The energy savings provided by CSM increase with longer Asleep and shorter SleepAware state periods. However, this also leads to increased communication delays. Moreover, too short SleepAware time may degrade dynamic bandwidth assignment (DBA) performance and even may cause delay of urgent PLOAM messages from OLT. Neither CSM standards nor existing studies provide any detailed framework to configure CSM performance and control parameters in accordance to the target delays. Another limitation of existing studies is their assumption of a single traffic class during sleep mode analysis. They do not consider the impact of CSM on Type-1 (T1) to Type-4 (T4) traffic classes defined by International Telecommunication Union (ITU). Most of these studies also neglect the …