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Commit 3540d11b authored by Javier Serrano's avatar Javier Serrano
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Introductory slides for WR workshop 9

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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Title Page Info %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\title{White Rabbit Workshop 9}
\subtitle{Introduction}
\author[J. Serrano] % (optional, use only with lots of authors)
{Javier Serrano}
\institute{CERN BE-CO\\Hardware and Timing section}
\date[14 March 2016]{Amsterdam, 14 March 2016}
\AtBeginSection[]
{
\begin{frame}<beamer>{Outline}
\tableofcontents[currentsection]
\end{frame}
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\begin{document}
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\frame{
\titlepage
%\hfill {\footnotesize With help from Steve Smith (SLAC)}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% \section[Outline]{}
% this puts the outline before EACH section automatically & will
% highlight the section you're about to talk about
\frame{\tableofcontents}
% Structuring a talk is a difficult task and the following structure
% may not be suitable. Here are some rules that apply for this
% solution:
% - Exactly two or three sections (other than the summary).
% - At *most* three subsections per section.
% - Talk about 30s to 2min per frame. So there should be between about
% 15 and 30 frames, all told.
% - A conference audience is likely to know very little of what you
% are going to talk about. So *simplify*!
% - In a 20min talk, getting the main ideas across is hard
% enough. Leave out details, even if it means being less precise than
% you think necessary.
% - If you omit details that are vital to the proof/implementation,
% just say so once. Everybody will be happy with that.
\section[WR Intro]{Introduction to White Rabbit}
\subsection{}
\begin{frame}{Dispelling the commercial vs open myth}
\begin{center}
\includegraphics[width=\textwidth]{ohwr/commercial_and_open.pdf}
\end{center}
\end{frame}
\begin{frame}{White Rabbit: an \emph{extension} of Ethernet}
\begin{columns}[c]
\column{.47\textwidth}
\begin{itemize}
% \item Few thousands nodes
\item Bandwidth: 1 Gbps
\item Single fiber medium
\item Up to 10 km links
\item WR Switch: 18 ports
\item Allows non-WR Devices
\item Ethernet features (VLAN) \& protocols (SNMP)
\end{itemize}
\column{.6\textwidth}
\begin{center}
\includegraphics[width=1.0\textwidth]{network/WR_network-ethernet.pdf}
\end{center}
\end{columns}
\end{frame}
\begin{frame}{White Rabbit: an \emph{extension} of Ethernet}
\begin{columns}[c]
\column{.47\textwidth}
Two separate services (enhancements to Ethernet) provided by WR:
\begin{enumerate}
\item \color{blue!90}{Synchronization:}
\begin{itemize}
\item accuracy\\ better than 1 ns
\item precision in the tens of ps
\end{itemize}
\item \color{red}{Deterministic, reliable and low-latency Control Data delivery}
\end{enumerate}
\column{.6\textwidth}
\begin{center}
\includegraphics[width=1.0\textwidth]{network/wr_network-enhanced_pro.pdf}
\end{center}
\end{columns}
\end{frame}
\section{Technology}
\subsection{}
\begin{frame}{Precision Time Protocol (IEEE 1588)}
\begin{columns}[c]
\column{1.5in}
\begin{center}
\includegraphics[height=5cm]{protocol/ptp_exchange.pdf}
\end{center}
\column{2.5in}
\begin{itemize}
\item Frame-based \\ synchronization protocol.
\item Synchronizes local clock \\ with the master clock.
\item Link delay evaluated by measuring and exchanging
frames with tx/rx timestamps.
\end{itemize}
\end{columns}
\end{frame}
\begin{frame}{Layer 1 Syntonization}
\begin{block}{Common clock for the entire network}
% \textbf{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{center}
% \includegraphics[width=\textwidth]{misc/dmtd.pdf}
% \end{center}
% \end{frame}
% \begin{frame}{Link delay model}
% \begin{center}
% \includegraphics[width=0.9\textwidth]{protocol/link-model.pdf}
% \end{center}
% \end{frame}
\begin{frame}{White Rabbit Switch}
\begin{center}
\includegraphics[width=6.0cm]{switch/wrSwitchV3.jpg}
\end{center}
\begin{itemize}
\item Central element of WR network
\item Original design optimized for timing, designed from scratch
\item 18 1000BASE-BX10 ports
% \item Capable of driving 10 km of single mode fiber
\item Open design (H/W and S/W)
\item Commercially available
% \item 200 ps synchronization accuracy
\end{itemize}
\end{frame}
\begin{frame}{WR Node example : 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 PTP Core}
\begin{center}
\includegraphics[width=0.9\textwidth]{node/wrpc_inside.pdf}
\end{center}
\end{frame}
% \section{Performance}
% \subsection{}
% \begin{frame}{WR time transfer performance: 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}{Determinism}
% \pause
% \begin{block}{Deterministic by design}
% You know what the frame latency will be because you have the VHDL
% source of the switch FPGA. IEEE 802.1Q headers supported.
% \end{block}
% \pause
% \begin{block}{Low latency}
% Cut-through design. Current latency through the switch is
% $\sim$3\textmu s without much effort. Good for (some) feedback systems.
% \end{block}
% \pause
% \begin{block}{Suitable for time-based control and data acquisition}
% Combining a low upper bound in latency and a good common notion of time.
% \end{block}
% \end{frame}
\section{This workshop}
\subsection{}
\begin{frame}{This workshop}
\pause
\begin{block}{Discuss current developments}
IEEE 1588 standardization, network management, robustness, pushing
timing performance, lots of new applications\ldots
\end{block}
\pause
\begin{block}{Brainstorm about the future}
Start thinking about new switch design? Higher-level protocols?
Copper? 10GbE? Redundancy standards? How to handle WR growth? Roles
of companies, institutes and individuals?
\end{block}
\end{frame}
\begin{frame}{Mechanics of the workshop}
\begin{itemize}
\pause
\item Do not hesitate to ask, comment and submit constructive
criticism.
\pause
\item Use coffee/lunch breaks and evenings to go into more detail.
\pause
\item Have fun!
\end{itemize}
\pause For more information see
\href{http://www.ohwr.org/projects/white-rabbit/wiki}{http://www.ohwr.org/projects/white-rabbit/wiki}
\end{frame}
\end{document}
\ No newline at end of file
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