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packet-based network with sub-ns accuracy. The protocol results from the packet-based network with sub-ns accuracy. The protocol results from the
combination of IEEE1588-2008 (*Precision Time Protocol*, PTP) with two combination of IEEE1588-2008 (*Precision Time Protocol*, PTP) with two
further extensions: automatic precise measurement of the link delay and further extensions: automatic precise measurement of the link delay and
clock syntonization over the physical layer with Synchronous Ethernet clock syntonization over the physical layer (similar to SyncE).
(SyncE).
White Rabbit evolved into an extension of the Precision Time Protocol White Rabbit evolved into an extension of the Precision Time Protocol
(PTP) and is therefore referred to as WRPTP. WRPTP is fully compatible (PTP) and is therefore referred to as WRPTP. WRPTP is fully compatible
with PTP and is currently defined as a PTP Profile. with PTP and is currently defined as a PTP Profile.
The extensions included in WRPTP are now being evaluated by P1588 The solutions included in WRPTP are now being evaluated by P1588 Working
Working Group to be included into the PTP standard. Group":https://ieee-sa.centraldesktop.com/1588public/ to be included
into the PTP standard in its next revision.
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([presentation](https://www.ohwr.org/project/white-rabbit/uploads/442e2b2eca547f69b85c28ff465ce240/WRspecialSession_Maciej_ISPCS2012.pdf), ([presentation](https://www.ohwr.org/project/white-rabbit/uploads/442e2b2eca547f69b85c28ff465ce240/WRspecialSession_Maciej_ISPCS2012.pdf),
[document](https://www.ohwr.org/project/white-rabbit/uploads/b0c0f513bf8734bc856f6860fa693201/ISPCS2012-specialSession-final.pdf)) [document](https://www.ohwr.org/project/white-rabbit/uploads/b0c0f513bf8734bc856f6860fa693201/ISPCS2012-specialSession-final.pdf))
at the Special Session of at the Special Session of
[ISPCS2012](http://www.ispcs.org/2012/index.html). [ISPCS2012](http://www.ispcs.org/2012/index.html). This Special Session
showed an interest and need for reasonably broad IEEE1588 revision. The
The Special Session showed an interest and need for reasonably broad first step in revising PTP was the preparation of Project Authorization
IEEE1588 revision. The first step in revising PTP was the preparation of Request (PAR) by a Study Group at the beginning of 2013. The PAR states
Project Authorization Request by a Study Group at the beginning of 2013. that the revised protocol "enhances support for synchronization to
better than 1 nanosecond" which reflects the enthusiasm to evaluate
White Rabbit extensions.
The revision process of the IEEE1588 Precision Time Protocol (PTP) The revision process of the IEEE1588 Precision Time Protocol (PTP)
standard started in mid-2013. The revision work is done by the [P1588 standard started in mid-2013. The revision work is done by the [P1588
......