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\section{Traditional CERN protocols}
\label{sec:survey_cern}
CERN of course already had some protocols developed to transfer data between devices. It is very interesting and important for the purpose of this assignment to also look at the existing protocols CERN already has implemented. This way it would also be possible to inspect what their specific pros and cons are and why they are or were adopted.
 
\subsection{S-Link}
S-Link is a protocol developed in 1995 at CERN and stands for Simple Link Interface. It was developed to connect any layer of front-end electronics to the next layer of read-out electronics. There are multiple implementations of the S-Link available which are also sold as cards. HOLA (High-speed Optical Link for Atlas) is the most recent variant which offers data rates up to 2.0 Gbps.  
There is a some information on the S-Link64 which could achieve a throughput of 6,4Gbps.\cite{S-Link}
 
\begin{figure}[h]
	\centering
	\includegraphics[width=0.6\textwidth]{S-Link.png}	
	\caption{S-Link overview.}
\end{figure}
 
In addition to the data transfer, S-Link also offers error detection, a return channel for flow control and for return line signal and even offers a function for self-testing.\cite{GBT_Frame}
 
\subsection{FULL mode}
 
 
\subsection{GBT protocol}
\begin{figure}[H]
	\centering
	\includegraphics[width=0.7\textwidth]{GBT_Frame.png}	
	\caption{Frame of the GBT procol.}
\end{figure}
\subsection{Low Power GBT protocol}
\newpage