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MS EE Scholarly Paper Presentation Dynamic Bandwidth Allocation using IPACT in EPON By Prerna Arora Advisor: Dr. Brian Mark Wednesday, August 8th, 2007 3:00p.m. S&T II, Room 230A Abstract EPON i.e. Ethernet Passive Optical Networks is a technology that transmits data in the form of Ethernet frames over Fiber-Optic medium. These are point-to-multipoint networks i.e. a combination of both, shared as well as point-to-point networks which are increasingly being used due to demand for higher bandwidth. EPON consists of a single OLT (Optical Line Terminal) and several ONUs (Optical Network Units) which in turn are connected to various end-users. The downstream transmission is broadcast to all the ONUs and is selectively absorbed by the destination ONU and ignored by the others, whereas in upstream transmission each ONU sends packets for the OLT. Thus, to avoid collision of frames from the ONUs when they transmit at the same time, each ONU should transmit in a particular timeslot, i.e. Bandwidth has to be allocated to each ONU. The static TDM scheme where every ONU receives a fixed time slot to transmit, though very simple, has the drawback that Statistical Multiplexing between the ONUs is not possible. Due to the burstiness of traffic, some timeslots overflow while as other remain underutilized. This results in the PON Bandwidth being underutilized. A dynamic scheme which reduces the timeslot size when there is no data to send, would allow the excess bandwidth to be used by the busy ONUs. Thus, in this paper, the performance of various Grant scheduling services based on the IPACT method used in the Dynamic Bandwidth Allocation (DBA) algorithm for EPON are discussed.
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