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Commit b1733a2d authored by Javier Serrano's avatar Javier Serrano
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Incomplete intro slides for WRWS11

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all : wr_ws11_intro_2021_10.pdf
.PHONY : all clean
wr_ws11_intro_2021_10.pdf : wr_ws11_intro_2021_10.tex
pdflatex $^
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presentations/WR_Javier_Intro_WRWS11/wr_ws11_intro_2021_10.tex 0 → 100644
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\documentclass[compress, red]{beamer}
\mode<presentation>
\usepackage{etex}
\setbeamertemplate{navigation symbols}{}
%\usepackage{pgfpages}
%\usepackage{listings}
\usetheme{Warsaw}
% define your own colors:
\definecolor{Red}{rgb}{1,0,0}
\definecolor{Blue}{rgb}{0,0,1}
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\useoutertheme[subsection=false]{smoothbars}
% include packages
\usepackage{subfigure}
\usepackage{multicol}
\usepackage{amsmath}
\usepackage{epsfig}
\usepackage{graphicx}
\usepackage[all]{xy}
%\xyoption{arc}
\usepackage{url}
\usepackage{multimedia}
\usepackage{hyperref}
\usepackage{helvet}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{changepage}
\usepackage{textcomp}
\newcommand{\backupbegin}{
\newcounter{framenumberappendix}
\setcounter{framenumberappendix}{\value{framenumber}}
}
\newcommand{\backupend}{
\addtocounter{framenumberappendix}{-\value{framenumber}}
\addtocounter{framenumber}{\value{framenumberappendix}}
}
\graphicspath{ {../../figures/} }
\usepackage[font=small,skip=0pt]{caption}
\captionsetup{labelformat=empty,labelsep=none}
%\setlength{\abovecaptionskip}{5pt plus 3pt minus 2pt}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Title Page Info %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\title[White
Rabbit \hspace{18em}\insertframenumber/\inserttotalframenumber]{Introduction
to White Rabbit and to the Workshop}
% \subtitle{And some notes on GMT and BST}
% \author[CERN\hspace{17em} Maciej Lipi\'{n}ski]{Maciej Lipi\'{n}ski}
% \author[European Organization for Nuclear Research $\mid$ Maciej Lipi\'{n}ski]{Maciej Lipi\'{n}ski}
% \author[Maciej Lipi\'{n}ski $\mid$ European Organization for Nuclear Research]{Maciej Lipi\'{n}ski}
\author[Javier Serrano $\mid$ CERN BE-CEM-EDL]{Javier Serrano}
\institute{European Organisation for Nuclear Research\\(CERN)}
\date[6 October 2021]{11\textsuperscript{th} White Rabbit Workshop \vspace{0.5cm}\\6 October 2021}
\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[Intro to WR]{Introduction to White Rabbit}
\subsection{}
%=======================
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}{What is White Rabbit?}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{columns}[c]
\column{0.65\textwidth}
\footnotesize
% \textcolor{white}{dddd dsaf asd fasd fdsa fads f dsa fdsa f dsaf dsa fdsa f dsaf dsaf fds}
\begin{itemize}
\item Initiated to renovate CERN's and GSI's accelerator
timing systems
\item \textbf{Based on well-established standards}
\begin{itemize}\scriptsize
\item Ethernet \textcolor{gray}{(IEEE 802.3)}
\item Bridged Local Area Network \textcolor{gray}{(IEEE 802.1Q)}
\item Precision Time Protocol \textcolor{gray}{(IEEE 1588)}
\end{itemize}
\item Extends standards to meet new requirements and provides
\begin{itemize}\scriptsize
\item \color{blue}{Sub-ns synchronisation}
\item \color{blue}{Deterministic data transfer}
\end{itemize}
\item Initial specs: links $\leq$10~km \& $\leq$2000 nodes
% \item<7-> Initial network specification:
% \begin{itemize}\scriptsize
% \item Fiber links length: $\leq$10~km
% \item Number of nodes: $\leq$2000
% \end{itemize}
\item \textbf{Open Source and commercially available}
% \item<9-> Many users worldwide, inc. metrology labs...
\end{itemize}
% \textcolor{white}{dddd dsaf asd fasd fdsa fads f dsa fdsa f dsaf dsa fdsa f dsaf dsaf fds}
% \textcolor{white}{dddd dsaf asd fasd fdsa fads f dsa fdsa f dsaf dsa fdsa f dsaf dsaf fds}
\textcolor{white}{dddd dsaf asd fasd fdsa fads f dsa fdsa f dsaf dsa fdsa f dsaf dsaf fds}
\column{0.55\textwidth}
\begin{center}
\includegraphics[height=0.7\textheight]{network/wr_network-enhanced_pro_without_10km.pdf}
% \includegraphics<3>[width=0.85\textwidth]{misc/LAN.jpg}
% \includegraphics<4>[width=0.8\textwidth]{misc/ieee-1588-ptp-example.jpg}
% \includegraphics<5>[width=1.0\textwidth]{network/WR_network-ethernet.pdf}
% \includegraphics<6->[width=1.0\textwidth]{network/wr_network-enhanced_pro-v2.pdf}
\end{center}
\end{columns}%\small\pause\pause\pause\pause\pause\pause\pause\pause
% \url{https://www.ohwr.org/projects/white-rabbit/}
\end{frame}
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% \begin{frame}{Open \textbf{and} commercially available off-the-shelf}
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% \includegraphics[width=1.0\textwidth]{misc/WR-zoo.jpg}\vspace{-1cm}
%% \begin{center}
%% \small
%% \textbf{Companies selling White Rabbit:} \url{www.ohwr.org/projects/white-rabbit/wiki/wrcompanies}
%% \end{center}
%% \end{frame}
%% \section{Technology}
%% \subsection{}
\begin{frame}{White Rabbit technology - sub-ns synchronisation}
\begin{block}{Based on}
\begin{itemize}
\item IEEE 1588 Precision Time Protocol \\ on Gigabit Ethernet over fibre
\end{itemize}
\end{block}
\pause
\begin{block}{Enhanced with}
\begin{itemize}
\item Layer 1 syntonisation
\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<1>[height=5cm]{protocol/ptp_exchange-enhanced.jpg}
\includegraphics<2->[height=4cm]{protocol/ptpNetwork.jpg}
\end{center}
\column{.75\textwidth}
\begin{itemize}
\item Frame-based synchronisation protocol
\item Simple calculations:
\begin{itemize}
\item link delay: $\delta_{ms} = \frac{(t_{4}-t_{1}) - (t_{3}-t_{2})}{2}$
\item offset from master: $OFM = t_{2} - (t_{1} + \delta_{ms})$
\end{itemize}
\item<2-> Hierarchical network
\item<3-> Shortcomings of traditional PTP:
\begin{itemize}
\item devices have free-running oscillators
\item frequency drift compensation traffic can compromise determinism of
other messages
\item assumes symmetry of medium
\item resolution of timestamps
\end{itemize}
\end{itemize}
\end{columns}
\end{frame}
\begin{frame}{Layer 1 Syntonisation}
%\begin{block}{Common clock for the entire network}
\begin{itemize}\small
\item Clock is encoded in the Ethernet carrier and recovered by the receiver chip
\item All network devices use the same physical layer clock
\item Clock loopback allows phase detection to enhance precision of timestamps
% \item Phase detection allows sub-ns delay measurement
\end{itemize}
%\end{block}
\vspace{-0.2cm}
\begin{center}
\includegraphics<1>[height=5cm]{misc/synce_v3.pdf}
% \includegraphics[height=4.5cm]<2>{p1588/1588-ha-L1vsPTP-simplified.jpg}
\end{center}
\end{frame}
\begin{frame}{Digital Dual Mixer Time Difference (DDMTD)}
\begin{itemize}
\item Precise phase measurements in FPGA
\item WR parameters:
\begin{itemize}\scriptsize
\item $clk_{in}~~~~~~~~=62.5$~MHz
\item $clk_{DDMTD}=62.496185$~MHz (N=14)
\item $clk_{out}~~~~~~=~~3.814$~kHz
\end{itemize}
\item Theoretical resolution of 0.977~ps
\end{itemize}
\vspace{-0.2cm}
\begin{center}
\includegraphics[width=\textwidth]{misc/ddmtd_3.jpg}
\end{center}
\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{columns}
\column{.65\textwidth}
\footnotesize
\begin{itemize}
\item <1->Correction of Round Trip Time (RTT) for asymmetries
\item <2->Asymmetry sources: FPGA, PCB, SFP electrics/optics, chromatic dispersion
\item <3->Link delay model:
\begin{itemize}\scriptsize
\item \textbf{Fixed delays} -- calibrated/measured
\item \textbf{Variable delays} -- evaluated online with:\vspace{0.1cm} $\alpha = \frac{\nu_g(\lambda_s)}{\nu_g(\lambda_m)} -1 = \frac{\delta_{ms} - \delta_{sm}}{\delta_{sm}}$
\end{itemize}
\item <4-> Accurate offset from master (OFM):\scriptsize \\\vspace{0.2cm}
% $RTT=(t_{4}-t_{1}) - (t_{3}-t_{2})$\\
$\delta_{ms}~ = \frac{1 + \alpha}{2 + \alpha} \, (RTT - \sum \Delta - \sum \epsilon)$\vspace{0.2cm}
$OFM = t_{2} - (t_{1} + \delta_{ms} + \Delta_{txm} + \Delta_{rxs} + \epsilon_S)$
\end{itemize}
\column{.5\textwidth}
\begin{center}
\includegraphics<1>[width=1.0\textwidth]{protocol/link-delay-model-detailed-1.jpg}
\includegraphics<2>[width=1.0\textwidth]{protocol/link-delay-model-detailed-2.jpg}
\includegraphics<3->[width=1.0\textwidth]{protocol/link-delay-model-detailed-3.jpg}\\\pause\pause\pause
%\tiny See: \textit{WR Calibration} [9]
\end{center}
\end{columns}
% \pause\pause\pause\pause
% \scriptsize See: \textit{WR Calibration}, version 1.1, G.Daniluk
\end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section[WR Ecosystem]{The White Rabbit Ecosystem}
\subsection{}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Open Source Hardware, Gateware and Software
% Introduce Public Core: proprietary innovation in the periphery
% Open and commercial slide
% The importance of standards: not always easy
% Communication in forums: what's going on?
%% \begin{frame}{The White Rabbit ecosystem 1/2}
%% \begin{block}{Individuals, companies and public institutions}
%% \begin{itemize}
%% \item Open Source provides level playing field.
%% \item ``Open Core'' business model with ever-expanding core.
%% \item Most contributions paid with public money are published under an
%% open-source licence. See \textcolor{cyan}{
%% \href{https://ohwr.org/project/ohr-meta/wikis/Documents/oshw-in-public-institutions}
%% {https://ohwr.org/project/ohr-meta/wikis/Documents/oshw-in-public-institutions}}.
%% \end{itemize}
%% \end{block}
%% \end{frame}
%% \begin{frame}{The White Rabbit ecosystem 2/2}
%% \begin{block}{Challenges ahead}
%% \begin{itemize}
%% \item How to maintain a healthy ever-expanding open core? The issue with
%% patents.
%% \item How to manage the evolution of WR in a fair, transparent way?
%% \item How to make WR more sustainable, providing a template other FOSS and
%% OSHW projects can use?
%% \end{itemize}
%% \end{block}
%% Should we create a White Rabbit Foundation?
%% \end{frame}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{This Workshop}
\subsection{}
\begin{frame}{This Workshop}
\begin{itemize}
\item blah
% Very informal
% The biggest asset of the WR project is its community
% You are in charge of your time slot. Try to leave time for questions
% Special discussion session on Thursday at 16:30 CEST
\end{itemize}
\end{frame}
\end{document}
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