Commit c1a709a8 authored by Maciej Lipinski's avatar Maciej Lipinski

more changes

parent 35a425dc
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......@@ -116,7 +116,7 @@ manner ensuring at most a single failure per year for a network of 2000 WR nodes
Since its conception in 2008, the number of WR applications has grown beyond
any expectation. The WR Users website \cite{biblio:WRusers} attempts to keep
track of WR applications and the newsletter in \cite{biblio:WR-APPLICATIONS-SNAPSHOT}
provides a status of a number of WR application in June 2018. Apart from the suitable synchronization performance, the reasons for such a proliferation of WR applications
provides a status in June 2018 of some of these applications. Apart from the suitable synchronization performance, the reasons for the proliferation of WR applications
are the open nature of the WR project and the fact that the WR technology is based
on standards. The former encourages collaboration,
reuse of work and adaptations that also prevent vendor lock-in. The latter allows using
......@@ -203,8 +203,8 @@ Deutsche B{\"o}rse & Germany & TS & 1~km &
\multicolumn{7}{|c|}{\textbf{Total number of WR network elements in the applications listed above }} \\ \hline
% \multicolumn{7}{|c|}{\textbf{(out of few hundred WR Switches and few thousands WR Nodes sold as of 2018) }} \\ \hline
\multicolumn{4}{|r|}{\textbf{WR nodes} (few thousands sold till 2018): } & \textbf{464} & \textbf{17592} & \\
\multicolumn{4}{|r|}{\textbf{WR switches} (few hundreds sold till 2018): } & \textbf{82} & \textbf{1532} & \\ \hline
\multicolumn{4}{|r|}{\textbf{WR nodes} (few thousand sold till 2018): } & \textbf{464} & \textbf{17592} & \\
\multicolumn{4}{|r|}{\textbf{WR switches} (few hundred sold till 2018): } & \textbf{82} & \textbf{1532} & \\ \hline
% \multicolumn{7}{|l|}{\textbf{Abbreviations used}} \\
\multicolumn{7}{|l|}{TF= time and frequency transfer, TC= time-triggered control, TS= timestamping,} \\
\multicolumn{7}{|l|}{TD= trigger distribution, FL= Fixed-latency data transfer, RF= Radio-Freq. transfer} \\
......@@ -282,8 +282,8 @@ The most basic application of WR is the transfer of time and frequency from the
Grandmaster WR switch/node (Grandmaster) to all other WR switches/nodes in
the WR network. WR ensures that the Pulse Per Second (PPS) outputs of all the
WR switches/nodes in the WR network are aligned to the PPS output of the
Grandmaster with a sub-nanosecond accuracy and tens of picoseconds precision, mean offset and standard deviation respectively.
% The accuracy is the mean offset between the PPS outputs while precision is the standard deviation of this offset.
Grandmaster with a sub-nanosecond accuracy and tens of picoseconds precision. %, mean offset and standard deviation respectively.
The accuracy is the mean of the offset between the PPS outputs, while the precision is the standard deviation of this offset.
WR switches and
nodes use and can output a clock signal (e.g. 10MHz, 125MHz) that is traceable to that
of the Grandmaster.
......@@ -543,7 +543,7 @@ Cherenkov Telescope Array (CTA) to be built in Chile and Spain \cite{biblio:CTA-
the Extreme Light Infrastructures (ELI) in Hungary \cite{biblio:ELI-ALP-WR} and Czech Republic
\cite{biblio:ELI-BEAMS-WR}, Satellite Laser Ranging at German Aerospace Center (DLR),
High Precision Timestamps Daily File Service at German Stock Exchange (Deutsche B{\"o}rse) \cite{biblio:WR-EUREXCHANGE}
or Phasor Measurement Units synchronization for Power Industry and Smart Grid studied at Swiss Federal
or Phasor Measurement Units synchronization for the power industry and smart grid applications studied at Swiss Federal
Institute of Technology Lausanne (EPFL) \cite{biblio:EPFL-WR-PMU}.
......@@ -610,6 +610,7 @@ their actions.
\begin{figure}[!ht]
\centering
\vspace{0.3cm}
% \includegraphics[width=0.5\textwidth]{applications/CERN/WRTD-2.jpg}
\includegraphics[width=0.5\textwidth]{applications/CERN/WRTD.jpg}
\caption{White Rabbit Trigger Distribution.}
\label{fig:WRTD}
......
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