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IEEE 1588 over Wireless Local Area Networks

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IEEE 1588 over Wireless Local Area Networks

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  1. The IEEE 1588 Precision Time Protocols (PTP) standard was developed to provide sub microsecond accuracy in system clock synchronization in 802.3 Ethernet networks. However the synchronization accuracy achieved is dependent on the configuration of the network i.e. the type of network devices, the number of devices in the network, which contribute to the load in the network, the processing delays at the PTP server and client and lastly the point of time-stamping of the PTP frames at the PTP server and client. This joint project between RIT and Spectracom Rochester investigated in detail the effects of the above mentioned factors in both 802.3 based Ethernet and 802.11b WLANs. The study was extended to 802.11b based WLANs due to recent increased interest in Wireless Sensor Actuator Networks (WSAN) for industry control, where high accuracy in time synchronization is essential. Protocol and processing delays at the PTP server and client was incorporated, and tests conducted to study effects with and without these processing delays i.e. by time-stamping the PTP packets at the PTP layer, where the packets incurred delays due to PTP and MAC layer processing and just before they left the physical layer, where they do not incur any processing delays. IEEE 1588 over Wireless Local Area Networks For the studies in both 802.3 based Ethernet and 802.11b based WLAN, test cases including different types of network devices, varying traffic loads and network configurations were covered. Test cases especially to study the effects of the contention based medium access, collision and back-off effects, and where applicable asymmetric traffic effects for both types of networks were used. The investigative studies gave a clear insight into the factors affecting the synchronization accuracy achieved between server and client and helped define the application limitation of the PTP clock while providing possible solutions to overcome the limitations. Year 2005 Funded CEIS, NYSTAR Nirmala Shenoy, Spectracomcorp, Rochester

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