\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\input{repeater}
\begin{document}
  \begin{tikzpicture}[every node/.style={scale=.8}]
   \user{u1}{ 0,0}{DM3MAT};
   \user{u2}{ 2,0}{DL1XYZ};	
   \user{u3}{ 6,0}{DL2XYZ};	
   \draw[dotted] (7,4) -- (7,-1);
   \activeuser{u4}{10,0}{I/DL3XYZ};
   \activerepeater{R1}{1,3}{DB0ABC, TG2621};
   \activerepeater{R2}{5,3}{DB0DEF, TG2621};
   \activerepeater{R3}{9,3}{I0ABC, (TG2621)};
   \path[->] (u4) edge node[above,rotate=-70]{GC: TG2621} (R3);
   \path[->] (R1) edge node[above,rotate=70]{GC: TG2621} (u1);
   \path[->] (R1) edge node[above,rotate=-70]{GC: TG2621} (u2);
   \path[->] (R2) edge node[above,rotate=-70]{GC: TG2621} (u3);
   \path[->] (R3) edge[bend right] node[below]{GC: TG2621} (R2);
   \path[->] (R3) edge[bend right] node[above]{GC: TG2621} (R1);
  \end{tikzpicture}
\end{document}
