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# White Rabbit Standardization in IEEE1588 Precision Time Protocol
The White Rabbit (WR) extension of the IEEE1588-2008 standard has being
generalized into a text of the 2019 edition of the standard (IEEE1588-2019).
The standardization process of WR has finished with the publication of IEEE1588-2019
The White Rabbit (WR) extension of the IEEE1588-2008 standard has been
generalized into a text of the 2019 edition of the IEEE1588 standard (IEEE1588-2019).
The standardization process of WR finished with the publication of IEEE1588-2019
on 15 June 2020. The generalized White Rabbit (under the name High Accuracy) is
the third default PTP Profile included in Annex I of the IEEE1588-2019.
This wiki page provides details regarding the White Rabbit extension and
its standardization in IEEE1588.
the third default PTP Profile included in Annex I of the IEEE1588-2019, along with a number of optional features; see details of [White Rabbit integration into IEEE1588-2019 as High Accuracy](https://www.ohwr.org/projects/wr-std/wiki/wrin1588).
This wiki page documents the project of WR standardization that started in 2012 and finished in 2020.
The goal of the project was to transform the White Rabbit extension of IEEE1588 into a recognized standard. The feasibility of the project goal, the target standard, the means and process of standardizing were all within the scope of this project.
# White Rabbit Standardization Project
## Introduction
*White Rabbit** (WR) is an extension of the IEEE1588-2008 (*Precision
*White Rabbit* (WR) is an extension of the IEEE1588-2008 (*Precision
Time Protocol*, PTP) standard. The WR extension has been developed to
synchronize nodes in a packet-based network with sub-ns accuracy.
Achieving such high accuracy results from the combination of
IEEE1588-2008 (*Precision Time Protocol*, PTP) with the following
IEEE1588-2008 with the following
further extensions:
1. clock syntonization over the physical layer (similar to SyncE),
2. enhancement of timestamps precision through phase detection,
3. automatic precise evaluation of link asymmetry.
1. Clock syntonization over the physical layer (similar to SyncE),
2. Enhancement of timestamps precision through phase detection,
3. Automatic precise evaluation of link asymmetry.
White Rabbit evolved into an extension of the Precision Time Protocol
(PTP) and is therefore referred to as WRPTP.
*WRPTP is fully compatible with PTP and is currently being defined as a
PTP Profile.**
**WRPTP is fully compatible with PTP and is defined as a PTP Profile.**
The solutions in WRPTP are have been included by the [P1588 Working
Group](https://sagroups.ieee.org/1588/) in the new
revision of the PTP standard, i.e. IEEE1588-2019. This is
described in [White Rabbit integration into IEEE1588-2019 as High Accuracy](https://www.ohwr.org/projects/wr-std/wiki/wrin1588).
-----
......@@ -38,8 +36,8 @@ described in [White Rabbit integration into IEEE1588-2019 as High Accuracy](http
The White Rabbit Protocol is defined in the White Rabbit Specification
(WR Spec) that describes:
- hardware requirements for implementing WRPTP
- protocol requirements for WRPTP-compatibility
- Hardware requirements for implementing WRPTP,
- Protocol requirements for WRPTP-compatibility.
### White Rabbit Specification material
......@@ -49,9 +47,9 @@ The White Rabbit Protocol is defined in the White Rabbit Specification
- [older versions of the WR
Specification](https://www.ohwr.org/project/wr-std/wikis/Documents/White-Rabbit-Specification-(Revision-History)) (to show how
the WR Spec evolved)
- [short information regarding different versions](Revisions) (i.e.
- [Short information regarding different versions](Revisions) (i.e.
feedback, comments, diffs)
- [issues and possible improvements to the current
- [Issues and possible improvements to the current
version](WrSpecV2issues)
-----
......@@ -59,16 +57,16 @@ The White Rabbit Protocol is defined in the White Rabbit Specification
## Standardization benefits and paths
Standardizing White Rabbit is unquestionably beneficial to the project
and its users and is expected to bring a substantial boost to the number
and its users and brings a substantial boost to the number
of WR applications.
Advantages of standardization:
- easier co-operation with companies
- increase of stability, viability, and credibility of the White
Rabbit solution
- feedback of experts that enables to polish the solution and make it
more mature
- Easier co-operation with companies,
- Increase of stability, viability and credibility of the White
Rabbit solution,
- Feedback of experts that enables to polish the solution and make it
more mature and robust.
Standardization is a considerably long process that can be approached in
various ways and from various directions. Potential paths (see
......@@ -78,12 +76,12 @@ for WR's standardization had been identified as follows:
- [Standardization at the International Telecommunication Union-
Telecommunication Standardization Sector
(ITU-T)](ITU-Tstandardization)
- within Telecom Profile (G.827x) - currently being developed
- within Telecom Profile (G.827x)
- as a separate Profile (similar to Telecom)
- [Standardization at the Institute of Electrical and Electronics
Engineers (IEEE)](IEEEstandardization)
- as an IEEE1588 PTP Profile
- included into version 3 of PTP (PTPv3) (**this is the chosen way
- included into next revision of IEEE1588 (PTP) (**this is the chosen way
of WR standardization**)
- as a part of
[AVB](http://www.ieee802.org/1/pages/avbridges.html) Gen2,
......@@ -96,19 +94,20 @@ for WR's standardization had been identified as follows:
## White Rabbit standardization within the IEEE1588 revision process
Including White Rabbit into the IEEE1588 (PTP) standard has been
identified as the best and feasible WR standardization path.
identified as the best and feasible WR standardization path.
White Rabbit was proposed to be included into PTP as a *High Accuracy
Option/Profile*
([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))
at the Special Session of
[ISPCS2012](http://www.ispcs.org/2012/index.html). This Special Session
[ISPCS2012](http://www.ispcs.org). This Special Session
showed an interest and need for reasonably broad IEEE1588 revision. The
first step in revising PTP was the preparation of Project Authorization
Request (PAR) by a Study Group at the beginning of 2013. The PAR states
that the revised protocol "enhances support for synchronization to
better than 1 nanosecond" which reflects the enthusiasm of the group to
evaluate White Rabbit extensions.
evaluate incorporation of the White Rabbit extensions into the standard.
The revision process of the IEEE1588 Precision Time Protocol (PTP)
standard started in mid-2013. The revision work was performed by the [P1588
......@@ -123,9 +122,9 @@ to a broader range of applications and include these generalized
solutions in the IEEE1588 standard.
- [P1588 Working Group](https://sagroups.ieee.org/1588/)
- P1588 Subcommittee *High Accuracy*: Co-chairs: John MacKay
([Progeny Systems Corporation](http://www.progeny.net/)) and
Maciej Lipinski ([CERN](http://home.cern)). Sec/Editor: Geoff
- **High Accuracy** P1588 Subcommittee: Co-chairs: John MacKay
(Progeny Systems Corporation) and
Maciej Lipinski (CERN). Sec/Editor: Geoff
Garner (Consultant for Huawei Technologies Co., Ltd.)
- [IEEE1588-2008 standard](http://ieeexplore.ieee.org/document/4579760/), available
through IEEE Explore Digital Library (payable)
......@@ -137,7 +136,7 @@ solutions in the IEEE1588 standard.
## Goal of this project
The goal of this project is to standardize the White Rabbit Protocol.
The goal of this project is to standardize the White Rabbit extension of the IEEE1588-2008 standard.
## Project plan
......@@ -153,12 +152,15 @@ The goal of this project is to standardize the White Rabbit Protocol.
identified, studied and evaluated
3. The most suitable path (in terms of costs, efforts, time)
decided (the end of 2012)
2. Standardization of White Rabbit within
[P1588](https://ieee-sa.centraldesktop.com/1588public/)
1. The standardization effort started (February 2013)
2. An official standardization of White Rabbit marks the end of
2. Standardization of White Rabbit
1. The standardization effort (started in February 2013)
2. Publication of a standard that includes White Rabbit marks the end of
the project
## Selected documents/presentations
-
## Project's timeline
||**Task**|**End date**|
......