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\centerline {\bf 5.8\_V2.2 SWITCH FROM BEP A TO BEP B } 
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: May 24, 2016}\\
\noindent{\bf Filename: switch\_bepa\_b} \\


\noindent {\bf BRIEF FUNCTIONAL DESCRIPTION:} \\

This is a contingency procedure to switch from using BEP A to using
BEP B.  

\normalsize
\vspace{0.25in}
\noindent The sequence of actions will be: 
\be
\item Issue power-down command for FEPs and video boards
\vspace{-0.10in}
\item Select BEP B
\vspace{-0.10in}
\item Cold boot BEPs
\vspace{-0.10in}
\item Verify BEP B boots from SW TLM
\vspace{-0.10in}
\item Check HW LEDs
\vspace{-0.10in}
\item Check SW LEDs
\vspace{-0.10in}
\item Issue power-down command for FEPs and video boards

\ee

The procedure does a cold boot to get the instrument into a known
state, so if there were patches loaded into
BEP B they will be lost.  The operator should be cognizant if patches
must be subsequently loaded.  The final power-down command ensures that the control register in the newly active BEP reflects the current FEP power status.

\vspace{0.15in}
\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes that DPA A \& B are on.\\
Assumes BEP A is functional and can accept a power-down command. \\

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\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize
None. \\

%\newpage 

\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize
Any patches loaded into BEP B will be removed as a result of this
procedure.  This procedure resets the focal plane temperature setting.\\

\vspace{0.15in}
\normalsize
\noindent {\bf REFERENCES:} \\
\normalsize

\normalsize
\noindent {\bf CHANGE HISTORY:} \\
\normalsize

{\bf V1.2}
\begin{itemize}
\item deleted commands at the beginning which powered down DPA side A
and powered up DPA side B
\item added the command to disable uplink boot in step 2.1 and perform
a cold boot instead of a warm boot
\end{itemize}

{\bf V1.3}
\begin{itemize}
\item added steps 2.5, 2.6, and 2.7 to verify that BEP B boot
properly.
\item added a Operational constraint/caution that patches in BEP B are
removed by this procedure.
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS Team signed-off version
\item changed expected value of ``1STAT7ST'' in step 2.6
\end{itemize}

{\bf V2.1}
\begin{itemize}
\item Modified the initial conditions to include the requirement: 
``The FEPs and the video boards must be powered off.''
\end{itemize}

{\bf V2.2}
\begin{itemize}
\item Added warning about focal plane temperature settings.
\item Minor formatting change to table.
\item Added steps to power down FEPs and video boards before and after the switch.
\item Added initial state for BEP A.
\end{itemize}

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\newcommand{\tablecaptiontext}{SWITCH FROM BEP A TO BEP B}
\input{switch_bepa_b.tab}

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