diff --git a/ex07/kn07.pdf b/ex07/kn07.pdf
index 4dd8ffb..a3c16dd 100644
--- a/ex07/kn07.pdf
+++ b/ex07/kn07.pdf
Binary files differ
diff --git a/ex07/kn07.tex b/ex07/kn07.tex
index e8883ac..659a948 100644
--- a/ex07/kn07.tex
+++ b/ex07/kn07.tex
@@ -87,7 +87,24 @@
 \header{6}{}{2015-12-02}{Kommunikationsnetze}{\textit{Jonas Jaszkowic, 3592719}\\\textit{Jan-Peter Hohloch, 3908712}}{WS 15/16}{4}
 \vspace{1cm}
 \Aufgabe{Banyan Switches}{20}\\
-The first stage is non-blocking, because there are lines for each input and $2N$ outgoing ports.\\ %TODO: This is probably not the solution, however I have no clue how to involve ascending order here...
+We assume $N=2^k,\ k\in\mathds{Z}$, otherwise it is possible to construct a blocking configuration.\\[0.2cm]
+The lower half of the whole switch is non-blocking if the upper half isn't (symmetric, we can exchange the labels $a_i$ and $b_i$).\\We have to show $a_i\geq N \oplus b_{N-i+1}\geq N$ which means only one of them has $1$ as most significant bit, the other $0$.\\
+Given $a_i < a_{i+1},\ b_i<b_{i+1}$ we know that $a_1\le N$ and $b_N\geq N-1$. We distinguish two cases:
+\begin{enumerate}[c1:]
+    \item Assume $a_1<N$\\
+        $\Rightarrow b_N\geq N$ since it is the largest of the $b_i$ and there are no other addresses left.\checkmark
+    \item Assume $a_1=N$\\
+        $\Rightarrow b_N=N-1$ since $a_1$ has to be the smallest of the $a_i$\checkmark
+\end{enumerate}
+So the switch for $a_1,b_N$ is non-blocking.\\
+Similar we can handle the switches $a_i,b_{N-i+1}$:\\
+We know that $i-1\le a_i < N+i\forall 1\le i\le N$, same for $b_i$.\\
+For the current switch we show:\\ $x\geq N \oplus y\geq N$, where $i-1\le x < N+i,\ N-i< y \le 2N-i$\\
+We distinguish two cases:
+\begin{enumerate}[c1:]
+    \item Assume $i-1\le x<N$\\%TODO
+    \item Assume $N\le x < N+i$\\
+\end{enumerate}
 \Aufgabe{Flow Control and ARQ Protocols}{22}
 \begin{enumerate}
     \item Flow Control means the controlling of the transmission of data. This is necessary for example if the receiver is slower or has higher traffic than the sender and can't keep up. For flow control ACK message can be used to acknowledge received messages (used in the examples from he lecture).