\documentclass[a4paper,12pt]{scrartcl}
\usepackage[ngerman]{babel}
\usepackage{graphicx} %BIlder einbinden
\usepackage{amsmath} %erweiterte Mathe-Zeichen
\usepackage{amsfonts} %weitere fonts
\usepackage[utf8]{inputenc} %Umlaute & Co
\usepackage{hyperref} %Links
\usepackage{ifthen} %ifthenelse
\usepackage{enumerate}
\usepackage{stmaryrd}

\usepackage{color}
\usepackage{algpseudocode} %Pseudocode
\usepackage{dsfont} % schöne Zahlenräumezeichen
\usepackage{amssymb, amsthm} %noch stärker erweiterte Mathe-Zeichen
\usepackage{tikz} %TikZ ist kein Zeichenprogramm
\usetikzlibrary{trees,automata,arrows,shapes}
\usepackage{pgfplots}

\pagestyle{empty}


\topmargin-50pt


\newcounter{aufgabe}
\def\tand{&}

\newcommand{\makeTableLine}[2][0]{%
  \setcounter{aufgabe}{1}%
  \whiledo{\value{aufgabe} < #1}%
  {%
    #2\tand\stepcounter{aufgabe}%
  }
}

\newcommand{\aufgTable}[1]{
  \def\spalten{\numexpr #1 + 1 \relax}
  \begin{tabular}{|*{\spalten}{p{1cm}|}}
    \makeTableLine[\spalten]{E\theaufgabe}$\Sigma$~~\\ \hline
    \rule{0pt}{15pt}\makeTableLine[\spalten]{}\\
  \end{tabular}
}

\def\header#1#2#3#4#5#6#7{\pagestyle{empty}
\begin{minipage}[t]{0.47\textwidth}
\begin{flushleft}
{\bf #4}\\
#5
\end{flushleft}
\end{minipage}
\begin{minipage}[t]{0.5\textwidth}
\begin{flushright}
#6 \vspace{0.5cm}\\
%                 Number of Columns    Definition of Columns      second empty line
% \begin{tabular}{|*{5}{C{1cm}|}}\hline A1&A2&A3&A4&$\Sigma$\\\hline&&&&\\\hline\end{tabular}\\\vspace*{0.1cm}
\aufgTable{#7}
\end{flushright}
\end{minipage}
\vspace{1cm}
\begin{center}
{\Large\bf Sheet #1}

{(Hand in #3)}
\end{center}
}



%counts the exercisenumber
\newcounter{n}

%Kommando für Aufgaben
%\Aufgabe{AufgTitel}{Punktezahl}
\newcommand{\Aufgabe}[2]{\stepcounter{n}
    \textbf{Exercise \arabic{n}: #1} (#2 Points)}

\newcommand{\textcorr}[1]{\textcolor{red}{#1}}
\newenvironment{corr}{\color{red}}{\color{black}\newline}
\newcommand{\ok}{\begin{corr}
            $\checkmark$
        \end{corr}}

\newcommand{\enot}[2]{#1 \cdot 10^{#2}}
\newcommand{\kHz}{\mathit{kHz}}
\newcommand{\mHz}{\mathit{mHz}}

\begin{document}
%\header{BlattNr}{Tutor}{Abgabedatum}{Vorlesungsname}{Namen}{Semester}{Anzahl Aufgaben}
\header{10}{}{2016-01-13}{Kommunikationsnetze}{\textit{Jonas Jaszkowic, 3592719}\\\textit{Jan-Peter Hohloch, 3908712}}{WS 15/16}{4}
\vspace{1cm}
\Aufgabe{Token Bucket}{10+10}
\begin{enumerate}
    \item bla 
    \item bla
\end{enumerate}
\Aufgabe{Wi-Fi - Problems}{5+10+5}
\begin{enumerate}
    \item bla
    \item bla
    \item bla
\end{enumerate}
\Aufgabe{Wi-Fi - CSMA/CA, RTS/CTS}{10+10+10}
\begin{enumerate}
    \item bla
    \item bla
    \item bla
\end{enumerate}
\Aufgabe{Broadband Internet Access}{3+3+3+3+3+3+3+3+3+3}
\begin{enumerate}
    \item An \textit{ADSL modem} modulates and demodulates the data using DMT and creates downstream and upstream channels.
    \item A \textit{DSL access multiplier} does the same at the ISP side.
    \item The typical range is $12000ft = 3657.6m$.
    \item The router assigns the IP address from the \textit{BRAS} to the customer using the \textit{PPP} protocol.
    \item ADSL uses $26 - 108 \kHz$ for upstream and $138 - 1104 \kHz$ for downstream.\\ Cable uses $5 - 42 \mHz$ for upstream, $54 - 450 \mHz$ for video and $550 - 750 \mHz$ for downstream.
    \item The data from separate coaxial cables are multiplexed on a single shared medium.
    \item Capacity sharing is realized with \textit{frequency division multiplexing} and with \textit{statistical time division multiplexing}.
    \item No, the cable modem receives all encrypted data broadcasted by the CMTS. The CM however only extract the data from the cable which is addressed to itself.
    \item Multiple CM fight for a minislot, CMTS assigns these minislots to the competing CMs. The CMs uses the assigned minislot for data transmission to the CMTS.
    \item The cable modem on the customer premise is configured and controlled by the CMTS using DOCSIS and layer 1 and 2 protocols.
\end{enumerate}
\end{document}