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\begin{center}
    {\huge openCom LTE - User Manual} \\
    LTE connectivity for your Framework Laptop. \\
    \vspace{5mm}
    \includegraphics[scale=0.35]{opencom-lte.png}
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\section{Introduction}
Thank you for purchasing the openCom LTE from Liberated Embedded
Systems.

Within your package you will find the following:
\begin{itemize}
    \item \textbf{1x openCom LTE}
    \item LTE antenna(s) (if ordered)
    \item SMA dust covers (if ordered)
    \item 3x assorted stickers
    \item This manual
\end{itemize}

\newpage

\section{Overview}
Within this section, we provide an overview of notable aspects of the openCom LTE.

\subsection{Top}

\begin{multicols}{2}
    The openCom LTE supports 3 antenna connections, with these being:
    \begin{itemize}
        \item An SMA main antenna for LTE connectivity (J1)
        \item An SMA diversity antenna to enhance connection reliability (J2)
        \item A u.FL GPS antenna for determining location (J3)
    \end{itemize}
    The LEDs D2 and D3 are status indicators, and are covered in the next
    section. 

    \columnbreak
    \includegraphics[scale=0.27]{top-circled.png}
\end{multicols}
Please note that a GPS antenna is \textbf{not included} with the device, and
one can only be connected with the top cover disassembled.

\subsubsection{LEDs}
\textbf{D3, or the left LED}, is red, and activates when the device is powered on.

\textbf{D2, or the right LED}, is red, and flashes differently depending on network status:
\begin{itemize}
    \item Short flashing - searching for cell tower
    \item Long flashing - idle
    \item Quick flicker - data transfer
    %\item Constantly on - voice calling
\end{itemize}


\subsection{Bottom}
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    On the rear side of the device, the SIM slot is present, which
    accepts a \textbf{nano sized} SIM card. 

    \vspace{5mm}

    The SIM can be inserted into the slot by pushing it until it clicks. It
    can also be removed by pushing it until it clicks, and it will spring
    out after. You may want to consider using the spudger end of your
    Framework screwdriver to help insert and remove it.

    \vspace{5mm}

    There are many test points present on rear of the device, which are
    documented in the next section.

    \columnbreak
    \includegraphics[scale=0.25]{bottom-circled.png}
\end{multicols}

\newpage

\subsection{Test points}
\begin{multicols}{2}
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    There are several test points available on the device, which allow you to
    test critical functionality of the device if you so choose.

    These are detailed below:
    \begin{itemize}
        \item TP1 - USB D+ trace
        \item TP2 - USB D- trace
        \item TP3 - GND
        \item TP4 - USB\_BOOT
        \item TP5 - VDD\_EXT
    \end{itemize}

    Note that to access TP1 and TP2, the resistor pads R13 and R14 must be
    bridged with wire or solder, as 0Ω resistors are not provided here.

    \subsubsection{Emergency download mode}
    If necessary, the module can be booted into emergency download mode by
    shorting TP4 and TP5 before powering it up. This will allow you to upgrade
    the firmware of the module over USB. The firmware upgrade can only be done with the QFlash utility from Quectel, which only works on Windows. A download link is provided in Section \ref{sec:Windows}.

    \columnbreak
    \includegraphics[scale=0.25]{test-points-circled.png}
\end{multicols}

\newpage

\section{Installation}
\begin{multicols}{2}
    In order to use your openCom LTE, you must first connect the external
    antenna(s) to facilitate communication.

    Connect an antenna to the \textbf{J1 port} on the device, which is the
    right external SMA connector. It is screwed on clockwise.

    Although the diversity antenna on the \textbf{J2 port} is optional,
    \textbf{consider also connecting it} to the device in order to ensure an
    optimal internet connection.


    \columnbreak
    \includegraphics[scale=0.2]{sma-circled.png}
\end{multicols}

Your openCom LTE is now assembled and ready to go, and can be inserted into
your Framework Laptop by slotting it into an empty Expansion Card bay.

\textbf{Remember to insert your SIM card!}

\newpage

\section{Usage}
\subsection{Antennas}
If you chose to bring your own LTE antennas at checkout, please ensure you
purchase LTE antennas with a VSWR < 2 for optimal performance.

Additionally, if you choose to purchase a GPS antenna for your use, ensure it is a passive antenna (active antennas are not supported), with a VSWR <= 2.

\subsection{Linux}
On Linux you may use NetworkManager with ModemManager to create a connection
for your openCom LTE. With the device plugged in, create a new connection,
choosing "mobile broadband", then progress through the Wizard. If you use
\textbf{Arch Linux}, there are great wiki articles on the subject.

\subsection{Windows}
\label{sec:Windows}
Download the drivers to interface with your openCom LTE from the following
link: \\
\texttt{https://link.liberatedsystems.co.uk/EG95} \\
Within the archive, you will find the executable file to install your drivers.

\newpage

\section{Enclosure}
\subsection{Disassembly}
There are two M2 screws on the exterior section of the device which hold on the
lid. Unscrewing them, you can take the lid off, and the LED columns with it
(\textbf{don't lose them!}).

There are just two M1 screws holding the circuit board onto the bottom of the
enclosure, which when removed allow for the removal of the board. However, we
do not recommend these screws are removed frequently, as their effectiveness
will decrease over time if they are.

\subsection{Assembly}
Insert the circuit board into the bottom of the enclosure, and fasten it in
with the two M1 screws.

Insert the LED columns into their respective holes on the lid (upside down).
Then, place the bottom part of the enclosure on top of the lid. Finally, insert
the M2 screws, and screw them into their respective holes on the exterior
section.

\newpage

\section{AT commands}
For information concerning the available AT commands, please download the
archive from the following link: \\
\texttt{https://link.liberatedsystems.co.uk/EG95} \\
Within, you will find a copy of the AT command manual for your openCom LTE,
which utilises Quectel's EG95 module.

\section{Durability}
Please be careful of the conditions in which you use this device, do not expose
it to rain or submerge it in bodies of water.


\section{Warranty}
Please follow the below URL in order to access information about your
warranty.
\\\texttt{https://store.liberatedsystems.co.uk/opencom-lte-warranty}

\newpage

\section{Contact}
If you have any issues with your openCom LTE, please reach out to us. You can
contact us via email or XMPP at \\\texttt{contact@liberatedsystems.co.uk}. 

\section{Legal}
Liberated Embedded Systems Ltd. is registered in England and Wales
(company no. 14722578). Our registered business address is
Portland House, Bute Street, Cardiff, CF10 5EQ. \\

We are not to be held responsible if the customer chooses to download
classified F35 schematics using our product, to build their own in their
garage.

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