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This paper discusses a device, the spider transparent clock, which can be used to retrofit existing bridges and routers to allow them to deliver highly accurate time using the IEEE 1588 protocol. The spider transparent clock corrects for the internal queuing jitter and asymmetry introduced by these bridges and routers.
This paper describes an application of the IEEE 1588 standard to industrial automation. Key application use cases are identified that can benefit from time-based control techniques to improve performance results over traditional control methods. A brief discussion of how the 1588 standard may be adopted suitable to these applications. Application problems specific to industrial automation are enumerated...
IEEE 802.1AS is being developed in the 802.1 working group as part of a set of standards for audio/video bridging (AVB). AVB networks will carry time-sensitive, high-quality, audio/video traffic, and IEEE 802.1AS will provide synchronization for these networks and ensure that the jitter, wander, and synchronization requirements for the time-sensitive traffic can be met. IEEE 802.1AS includes an IEEE...
Keeping slave clocks with sub-microsecond accuracy is believed to require hardware-assistance at physical layer and network. This paper presents software-only implementations of a slave for such accuracy. Time-stamps are read in the interrupt handler and a system resource conflicts detector filters out system-inside noise. We adopted Packet Inter-Arrival based clock servo technique that has fast convergence...
Clock synchronization protocols for packet-oriented networks, like IEEE 1588, depend on time stamps drawn from a local clock at distinct points in time. Due to the fact that software-generated time stamps suffer from jitter caused by non-deterministic execution times, many implementations for high precision clock synchronization rely on hardware support. This allows time readings for packets with...
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