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-rw-r--r--chapter01/content_ch01.tex (renamed from chapter01/content.tex)5
-rw-r--r--chapter01/exercise01.tex7
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diff --git a/chapter01/content.tex b/chapter01/content_ch01.tex
index 38706c1..aeadf28 100644
--- a/chapter01/content.tex
+++ b/chapter01/content_ch01.tex
@@ -1,5 +1,7 @@
\chapter{Communication Systems}
+\begin{refsection}
+
\section{What is Communication?}
\index{communication}
@@ -369,3 +371,6 @@ This course on digital communication systems mainly considers the physical layer
\item \textbf{Mesh}, special form \emph{Full Mesh}
\end{itemize}
+\printbibliography[heading=subbibliography]
+\end{refsection}
+
diff --git a/chapter01/exercise01.tex b/chapter01/exercise01.tex
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+++ b/chapter01/exercise01.tex
@@ -0,0 +1,7 @@
+\phantomsection
+\addcontentsline{toc}{section}{Exercise 1}
+\section*{Exercise 1}
+
+\begin{enumerate}
+ \item What is the difference between a \emph{digital communication system} and a \emph{service}? To which OSI layers are they associated?
+\end{enumerate} \ No newline at end of file