THE WHITE RABBIT PROJECT
THE WHITE RABBIT PROJECT
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发表时间：
2009-11
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通讯作者：
J. Serrano;T. Fleck;P. Alvarez;R. Bär;M. Kreider;J. Lewis;P. Loschmidt;S. Rauch;E. G. Cota;T. Wlostowski;P. Moreira;G. Gaderer;C. Prados;J. Dedic;M. Cattin
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作者：
J. Serrano;T. Fleck;P. Alvarez;R. Bär;M. Kreider;J. Lewis;P. Loschmidt;S. Rauch;E. G. Cota;T. Wlostowski;P. Moreira;G. Gaderer;C. Prados;J. Dedic;M. Cattin
在网络中可靠、快速和确定地传输控制信息是许多分布式系统的需要。一个例子是计时系统，其中使用参考频率来准确地调度时间关键型消息。白兔(WR)项目是一个由多个实验室和多家公司共同努力的项目，旨在将世界上最好的数据传输和计时技术结合在一个完全开放的设计中。它利用了IEEE 1588(精确时间协议)和同步以太网等提高以太网计时的最新发展。该方法旨在建立一种通用的、类似现场总线的传输系统，为大约1000个站点提供确定性的数据和定时(亚ns精度和ps抖动)。它会自动补偿10公里量级的光纤长度。本文介绍了水利枢纽的设计目标和工程所采用的规范。它接着描述了WR系统结构的中心组件--WR开关--并从理论上考虑了这些要求。最后，给出了第一批WR硬件样机的实际定时测量结果。
Reliable, fast and deterministic transmission of control information in a network is a need for many distributed systems. One example is timing systems, where a reference frequency is used to accurately schedule time-critical messages. The White Rabbit (WR) project is a multi-laboratory and multi-company effort to bring together the best of the data transfer and timing worlds in a completely open design. It takes advantage of the latest developments for improving timing over Ethernet, such as IEEE 1588 (Precision Time Protocol) and Synchronous Ethernet. The presented approach aims for a general purpose, fieldbus-like transmission system, which provides deterministic data and timing (sub-ns accuracy and ps jitter) to around 1000 stations. It automatically compensates for fiber lengths in the order of 10 km. This paper describes the WR design goals and the specification used for the project. It goes on to describe the central component of the WR system structure the WR switch - with theoretical considerations about the requirements. Finally, it presents real timing measurements for the first prototypes of WR hardware.