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# Wiki
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## White Rabbit Protocol (WRPTP)
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*White Rabbit** (WR) is a protocol developed to synchronize nodes in a
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packet-based network with sub-ns accuracy. The protocol results from the
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combination of IEEE1588-2008 (*Precision Time Protocol*, PTP) with two
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further requirements: precise knowledge of the link delay and clock
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syntonization over the physical layer with Synchronous Ethernet (SyncE).
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White Rabbit evolved into an extension of Precision Time Protocol (PTP),
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therefore it is referred to as WRPTP. WRPTP is fully compatible with PTP
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and is currently defined as a PTP Profile.
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## White Rabbit Specification (WR Spec)
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White Rabbit Protocol is described in **White Rabbit Specification** (WR
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Spec) which describes:
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- hardware requirements which need to be fulfilled to implement WRPTP
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- protocol requirements which need to be fulfilled by a device to be
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WRPTP-compatible
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The latest version of WR Spec can be found "here": .
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### White Rabbit Standardization
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