\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\input{repeater}
\begin{document}
 \begin{tikzpicture}[every node/.style={scale=.8}]
  \activeuser{u1}{ 0,0}{DM3MAT};
  \user{u2}{ 2,0}{DL1XYZ};	
  \user{u3}{ 4,0}{DL2XYZ};	
  \draw[dotted] (5,4) -- (5,-1);
  \activeuser{u4}{ 6,0}{DL3XYZ};
  \user{u5}{ 8,0}{DL4XYZ};
  \user{u6}{10,0}{DL5XYZ};
  \activerepeater{R1}{1,3}{DB0ABC};
  \repeater{R2}{3,3}{DB0DEF};
  \activerepeater{R3}{7,3}{DB0GHI};
  \activerepeater{R4}{9,3}{DB0JKL};
  \draw[->] (u1) -- node[above,rotate=70]{GC: TG9} (R1);
  \draw[->] (R1) -- node[above,rotate=-70]{GC: TG9} (u2);
  \draw[->] (u4) -- node[above,rotate=70]{GC: TG8} (R3);
  \draw[->] (R3) -- node[above,rotate=-70]{GC: TG8} (u5);
  \draw[->] (R4) -- node[above,rotate=-70]{GC: TG8} (u6);
  \path[->] (R3) edge[dashed,bend left] node[above]{via Netzwerk} (R4);
 \end{tikzpicture}
\end{document}
