Abstract
Guiling WuFeirang SuXinwan LiWeiwen ZouJianping ChenShanghai Jiao Tong UniversityDepartment of Electronic EngineeringState Key Laboratory of Advanced OpticalCommunication Systems and NetworksShanghai 200240, ChinaE-mail: wuguiling@sjtu.edu.cnAbstract. A passive optical network (PON) based real-time Ethernet(PONRTE), which can take advantage of PON features such as broadbandwidth, high reliability, and easy maintenance to satisfy the determi-nation and real-time requirements of high performance industrial applica-tions, is proposed. The protocol model and network architecture having acompatiblephysicallayerandMAClayerwithEthernetpassiveopticalnet-work are presented for the proposed PONRTE. A fixed periodic time slotallocation mechanism including a synchronic time division multiplexingtransmission and an asynchronic data transmission is adopted to guaran-tee the determination and real-time of the communication. A simple andeasy to implement time synchronization approach, where the starting timeof the first transmission slot of an access node is synchronized by a rel-ative time synchronization while the starting time of subsequent slots isdetermined by the fixed period and a dynamic time synchronization, isdesigned to support the fixed time slot allocation mechanism and avoidthe collision in PONRTE. A 100 Mb∕s PONRTE experimental testbedwith 16 access nodes and a time allocation period of 240 μs is demon-strated. The results show that the experimental PONRTE can work stablyand reliably with a frame loss ratio less than 10
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