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White Rabbit
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7c2f980b
Commit
7c2f980b
authored
Oct 04, 2017
by
Javier Serrano
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Intro slides for WR tutorial workshop
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presentations/WR_Javier_WRWS2017_Intro/Makefile
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presentations/WR_Javier_WRWS2017_Intro/wr_workshop_2017_intro.tex
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Title Page Info %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\title
[Introduction to White
Rabbit
\hspace
{
6em
}
\insertframenumber
/
\inserttotalframenumber
]
{
White
Rabbit
}
\subtitle
{
A quick introduction
}
\author
{
Javier Serrano
}
\institute
{
CERN BE-CO
\\
Hardware and Timing section
}
\date
[7 October 2017]
{
ICALEPCS pre-conference workshop
\\
Barcelona, 7 October 2017
}
\AtBeginSection
[]
{
\begin{frame}
<beamer>
{
Outline
}
\tableofcontents
[currentsection]
\end{frame}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Begin Your Document %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%\setbeamertemplate{caption}{\raggedright\insertcaption\par}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\frame
{
\titlepage
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
<beamer>
{
Outline
}
\tableofcontents
\end{frame}
\section
{
Introduction
}
\subsection
{}
%=======================
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
{
What is White Rabbit?
}
\begin{columns}
[c]
\column
{
0.8
\textwidth
}
\begin{itemize}
\item
A solution to problems in distributed real-time controls
and data acquisition
\item
Based on well-known technologies
\item
Open Hardware and Open Software with commercial support
\item
International collaboration
\item
Many users: CERN, GSI, KM3NET, cosmic ray detectors, metrology labs...
\end{itemize}
\column
{
0.3
\textwidth
}
\begin{center}
\includegraphics
[width=1.0\textwidth]
{
logo/WRlogo.pdf
}
\end{center}
\end{columns}
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
{
Why we use Open Hardware ?
}
\begin{center}
\includegraphics
[width=.7\textwidth]
{
ohwr/commercial
_
and
_
open.pdf
}
\end{center}
\begin{itemize}
\item
Get a design just the way we want it
\item
Peer review and design re-use
\item
Healthier relationship with companies
\end{itemize}
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
{
White Rabbit: an
\emph
{
extension
}
of Ethernet
}
\begin{columns}
[c]
\column
{
.5
\textwidth
}
\begin{itemize}
\item
Standard Ethernet network
\item
Ethernet features (VLAN)
\&
protocols (SNMP)
\end{itemize}
\begin{itemize}
\item
\color
{
Blue
}{
High accuracy synchronisation
}
\item
\color
{
Red
}{
Reliable and low-latency Control Data
}
\end{itemize}
\column
{
.6
\textwidth
}
\begin{center}
\includegraphics
[height=1.05\textwidth]
{
network/wr
_
network-enhanced
_
pro.pdf
}
\end{center}
\end{columns}
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
{
White Rabbit application examples
}
\begin{columns}
[c]
\column
{
0.7
\textwidth
}
\begin{itemize}
\item
<1->
\color
<2->
{
black!50
}{
CERN and GSI
}
\item
<2->
\color
<3->
{
black!50
}{
HiSCORE: Gamma
\&
Cosmic-Ray experiment
}
\item
<3->
\color
<4->
{
black!50
}{
The Large High Altitude Air Shower Observatory
}
\item
<4->
\color
<5->
{
black!50
}{
MIKES: Centre for metrology and accreditation
}
\item
<5->
{
KM3NET: European deep-sea neutrino telescope
}
\end{itemize}
\column
{
0.45
\textwidth
}
\begin{center}
\includegraphics
<1>[width=0.80
\textwidth
]
{
applications/gsiANDcern.pdf
}
\pause
\includegraphics
<2>[width=1
\textwidth
]
{
applications/tunka.pdf
}
\pause
\includegraphics
<3>[width=1
\textwidth
]
{
applications/lhaaso.pdf
}
\pause
\includegraphics
<4>[width=.7
\textwidth
]
{
applications/mikes.pdf
}
\pause
\includegraphics
<5->[width=1
\textwidth
]
{
applications/KM3NeT.pdf
}
\end{center}
\end{columns}
\pause
{
\small
More WR collaborators:
\url
{
https://www.ohwr.org/projects/white-rabbit/wiki/WRUsers
}}
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section
{
Technology
}
\subsection
{}
\begin{frame}
{
White Rabbit technology
}
\begin{block}
{
Based on
}
\begin{itemize}
\item
Gigabit Ethernet over fibre
\item
IEEE-1588 protocol
\end{itemize}
\end{block}
\pause
\begin{block}
{
Enhanced with
}
\begin{itemize}
\item
Layer 1 syntonization
\item
Digital Dual Mixer Time Difference (DDMTD)
\item
Link delay model
\end{itemize}
\end{block}
\end{frame}
% \begin{frame}{Open Systems Interconnection(OSI) network model}
% \begin{center}
% \includegraphics<1>[width=.6\textwidth]{misc/osi_layers_0.pdf}
% \includegraphics<2>[width=.6\textwidth]{misc/osi_layers_7.pdf}
% \includegraphics<3>[width=.6\textwidth]{misc/osi_layers_6.pdf}
% \includegraphics<4>[width=.6\textwidth]{misc/osi_layers_5.pdf}
% \includegraphics<5>[width=.6\textwidth]{misc/osi_layers_4.pdf}
% \includegraphics<6>[width=.6\textwidth]{misc/osi_layers_3.pdf}
% \includegraphics<7>[width=.6\textwidth]{misc/osi_layers_2.pdf}
% \includegraphics<8>[width=.6\textwidth]{misc/osi_layers_1.pdf}
% \end{center}
% \end{frame}
\begin{frame}
{
Ethernet switches in a nutshell
}
\begin{center}
%\includegraphics<1>[width=.6\textwidth]{misc/osi_layers_eth_sw.pdf}
\includegraphics
<2->[width=.3
\textheight
]
{
misc/home
_
switch.png
}
\includegraphics
<2->[width=.7
\textheight
]
{
misc/prof
_
switch.png
}
\includegraphics
<2>[width=.8
\textwidth
]
{
misc/switch
_
in
_
nutshell
_
mac.pdf
}
\includegraphics
<3>[width=.8
\textwidth
]
{
misc/switch
_
in
_
nutshell
_
1-2
_
mac.pdf
}
\includegraphics
<4>[width=.8
\textwidth
]
{
misc/switch
_
in
_
nutshell
_
1-3
_
mac.pdf
}
\includegraphics
<5>[width=.8
\textwidth
]
{
misc/switch
_
in
_
nutshell
_
1-2
_
3-1
_
mac.pdf
}
\end{center}
\end{frame}
% \begin{frame}{White Rabbit in OSI model}
% \begin{center}
% \includegraphics<1>[width=.6\textwidth]{misc/osi_layers_WR.pdf}
% \end{center}
% %\begin{center}
% % \begin{adjustwidth}{-1.5em}{-1.5em}
% % \includegraphics<2>[width=1.1\textwidth]{misc/switch-and-osi.pdf}
% % \end{adjustwidth}
% %\end{center}
% \end{frame}
% \begin{frame}{White Rabbit technology}
% \begin{block}{Based on}
% \begin{itemize}
% \item Gigabit Ethernet over fiber
% \item IEEE-1588 protocol
% \end{itemize}
% \end{block}
% \begin{block}{Enhanced with}
% \begin{itemize}
% \item Layer 1 syntonization
% \item Digital Dual Mixer Time Difference (DDMTD)
% \item Link delay model
% \end{itemize}
% \end{block}
% \end{frame}
\begin{frame}
{
Precision Time Protocol (IEEE 1588)
}
\begin{columns}
[c]
\column
{
.4
\textwidth
}
\begin{center}
\includegraphics
[height=5cm]
{
protocol/ptp
_
exchange.pdf
}
\end{center}
\column
{
.75
\textwidth
}
\begin{itemize}
\item
Frame-based synchronisation protocol.
\item
Simple calculations:
\begin{itemize}
\item
link
$
delay
_{
ms
}$
$
\delta
_{
ms
}
=
\frac
{
(
t
_{
4
}
-
t
_{
1
}
)
-
(
t
_{
3
}
-
t
_{
2
}
)
}{
2
}$
\item
clock
$
offset
_{
ms
}
=
t
_{
2
}
-
t
_{
1
}
+
\delta
_{
ms
}$
\end{itemize}
\item
<2> Disadvantages
\begin{itemize}
\item
assumes symmetry of medium
\item
all nodes have free-running oscillators
\item
frequency drift compensation vs. message exchange traffic
\end{itemize}
\end{itemize}
\end{columns}
\end{frame}
\begin{frame}
{
Layer 1 Syntonization
}
%\begin{block}{Common clock for the entire network}
\begin{itemize}
\item
All network devices use the same physical layer clock.
\item
Clock is encoded in the Ethernet carrier and recovered by the receiver chip.
\item
Phase detection allows sub-ns delay measurement.
\end{itemize}
%\end{block}
\vspace
{
-0.2cm
}
\begin{center}
\includegraphics
[height=4.5cm]
{
misc/synce
_
v3.pdf
}
\end{center}
\end{frame}
% \begin{frame}{Digital Dual Mixer Time Difference}{DDMTD}
% \begin{itemize}
% \item Used for precise phase measurements
% \item Implemented in FPGA and SoftPLL
% \item 62.5MHz WR clock and N=14 results in 3.814kHz output signals
% \end{itemize}
% \vspace{-0.2cm}
% \begin{center}
% \includegraphics[width=\textwidth]{misc/dmtd_2N.pdf}
% \end{center}
% \end{frame}
% %\begin{frame}{Deglitching algorithm -- to backup slides?}
% %\end{frame}
% \begin{frame}{SoftPLL}
% \begin{center}
% \includegraphics[width=.9\textwidth]{protocol/dmpll_diagram-slides.pdf}
% \end{center}
% \end{frame}
% \begin{frame}{Link delay model}
% \begin{center}
% \includegraphics[width=0.9\textwidth]{calibration/link-model.pdf}
% \end{center}
% \begin{itemize}
% \item static hardware delays: $\Delta_{TXM}$, $\Delta_{RXM}$, $\Delta_{TXS}$, $\Delta_{RXS}$
% \item semi-static hardware delays: $\epsilon_M$, $\epsilon_S$
% \item fiber asymmetry coefficient: $\alpha = \frac{\delta_{MS} - \delta_{SM}}{\delta_{SM}}$
% \end{itemize}
% \pause
% \begin{block}{}
% Calibration procedure to find $\Delta_{TXM}$, $\Delta_{RXM}$,
% $\Delta_{TXS}$, $\Delta_{RXS}$ and $\alpha$.
% \end{block}
% \end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section
{
Equipment
}
\subsection
{}
\begin{frame}
{
Typical WR network
}
\begin{center}
\includegraphics
[width=.5\textwidth]
{
network/wr
_
network-enhanced
_
pro.pdf
}
\end{center}
\end{frame}
\begin{frame}
[t,fragile]
{
White Rabbit Switch
}
\begin{center}
\includegraphics
[width=\textwidth]
{
switch/wrSwitch
_
v3
_
3.jpg
}
\begin{itemize}
\item
Central element of WR network
\item
18 port gigabit Ethernet switch with WR features
\item
Optical transceivers: up to 10km, single-mode fibre
\item
Fully open design, commercially available
\end{itemize}
\end{center}
\end{frame}
\begin{frame}
{
Simplified block diagram of the hardware
}
\vspace
{
-0.3cm
}
\begin{center}
\includegraphics
[width=.85\textwidth]
{
switch/switch3
_
4
_
simple
_
diagram
_
h.pdf
}
\end{center}
\end{frame}
\begin{frame}
{
Simplified block diagram of the gateware
}
\begin{center}
\begin{adjustwidth}
{
-1.5em
}{
-1.5em
}
\includegraphics
[width=1.1\textwidth]
{
switch/switch
_
hdl
_
simple.pdf
}
\end{adjustwidth}
\end{center}
\end{frame}
\begin{frame}
{
WR Node: SPEC board
}
\begin{center}
\includegraphics
[width=7cm]
{
node/spec.jpg
}
\end{center}
\begin{columns}
[c]
\column
{
.01
\textwidth
}
\column
{
.98
\textwidth
}
\begin{block}
{
FMC-based Hardware Kit
}
\begin{itemize}
% \item Carrier boards in PCI-Express, VME, PXIe
\item
All carrier cards are equipped with a White Rabbit port.
\item
Mezzanines can use the accurate clock signal and ``TAI''
\\
(synchronous sampling clock, trigger time tag, ...).
\end{itemize}
\end{block}
\column
{
.01
\textwidth
}
\end{columns}
\end{frame}
\begin{frame}
{
White Rabbit Node in more detail
}
\begin{center}
\includegraphics
[height=0.7\textheight]
{
node/wrNode.jpg
}
\end{center}
\end{frame}
\section
{
Performance
}
\subsection
{}
\begin{frame}
{
WR time transfer performance: basic test setup
}
\begin{center}
\includegraphics
[height=7.0cm]
{
measurements/meas
_
setup.pdf
}
\end{center}
\end{frame}
\begin{frame}
{
WR time transfer performance: test results
}
\begin{center}
\includegraphics
[height=6.0cm]
{
measurements/meas
_
results2.pdf
}
\end{center}
\end{frame}
% \begin{frame}{WR Switch: low jitter daughterboard}
% \begin{columns}
% \column{.35\textwidth}
% \includegraphics[width=.8\textheight, angle=90]{measurements/WRSlowJitter/rsz_3d_image__1_.jpg}
% \column{.65\textwidth}
% \begin{itemize}
% \item Current release of WRS in GM mode has suboptimal performance on both jitter (9ps RMS 1Hz-100kHz) and ADEV (1.4E-11 $\tau$=1s ENBW 50Hz)
% \item A daughterboard was designed, produced and tested to improve the performance
% \item Modified WRS improves performance on both jitter ($<$2ps RMS 10Hz-100kHz) and ADEV ($<$5E-13 $\tau$=1s ENBW 50Hz) in GM mode
% \end{itemize}
% \end{columns}
% \end{frame}
% \begin{frame}{Daughterboard Test Setup}
% \begin{center}
% \includegraphics[width=\textwidth]{measurements/WRSlowJitter/rsz_experimental_setup.png}
% \end{center}
% \end{frame}
% \begin{frame}{Test Results in GM mode: PM noise}
% \begin{center}
% \includegraphics[height=.85\textheight]{measurements/WRSlowJitter/pn.png}
% \end{center}
% \end{frame}
% \begin{frame}{Test Results in GM mode: Modified ADEV}
% \begin{center}
% \includegraphics[height=.85\textheight]{measurements/WRSlowJitter/mdev.png}
% \end{center}
% \end{frame}
% \begin{frame}{Test Results in Slave mode: PM noise}
% \begin{center}
% \includegraphics[height=.85\textheight]{measurements/WRSlowJitter/slave_pn.png}
% \end{center}
% \end{frame}
% \begin{frame}{Test Results in Slave mode: Modified ADEV}
% \begin{center}
% \includegraphics[height=.85\textheight]{measurements/WRSlowJitter/slave_mdev.png}
% \end{center}
% \end{frame}
\section
{
Current developments
}
\subsection
{}
\begin{frame}
{
Current developments
}
\begin{block}
{
Switches and nodes are commercially available
}
Work now revolves around better diagnostics and remote management of WR
networks as well as improving the phase noise and performing extensive network stress tests.
\end{block}
\pause
\begin{block}
{
Standardisation
}
IEEE 1588 revision process is ongoing and contains a sub-committee (High
Accuracy) dedicated to White Rabbit. Revised standard expected in mid-2018.
\end{block}
\pause
\begin{block}
{
Robustness
}
Based on redundant information and fast switch-over between
redundant fibres and switches.
\end{block}
\end{frame}
\begin{frame}
{
Ethernet Clock distribution a.k.a. Distributed DDS
}
\begin{center}
\includegraphics
[width=\columnwidth]
{
applications/remote
_
dds.pdf
}
\end{center}
\begin{block}
{
Distributed Direct Digital Synthesis
}
\begin{itemize}
\item
Replaces dozens of cables with a single fibre.
\item
Works over big distances without degrading signal quality.
\item
Can provide various clocks (RF of many rings and linacs)
with a single, standard link.
\end{itemize}
\end{block}
\end{frame}
\begin{frame}
{
Distributed oscilloscope
}
\begin{center}
\includegraphics
[width=0.9\textwidth]
{
applications/distr
_
oscill.pdf
}
\end{center}
\begin{block}
{}
\begin{itemize}
\item
Common clock in entire network: no skew between ADCs.
\item
Ability to sample with different clocks via Distributed DDS.
\item
External triggers can be time tagged with a TDC and used to reconstruct the original time base in the operator's
PC.
\end{itemize}
\end{block}
\end{frame}
\section
{
Conclusions
}
\subsection
{}
\begin{frame}
{
Summary
}
\begin{itemize}
\item
Open source (H/W
\&
S/W), with commercial support
\pause
\item
More applications than ever expected
\pause
\item
A versatile solution for general controls and data acquisition
\pause
\item
Standard-compatible and standard-extending
\pause
\item
Active participation in IEEE1588 revision
process. ISPCS~2018 will be at CERN. Consider submitting
papers on applications of WR! See
\url
{
http://www.ispcs.org
}
for
details.
\end{itemize}
% \pause
%For more information see http://www.ohwr.org/projects/white-rabbit/wiki
\end{frame}
\begin{frame}
{
Need more information?
}
\begin{center}
\includegraphics
[height=4.0cm]
{
misc/white
_
rabbit
_
end.png
}
\end{center}
\begin{center}
\url
{
https://www.ohwr.org/projects/white-rabbit/wiki
}
\end{center}
\end{frame}
\end{document}
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