In order to satisfy CBMNet's minimal frame length of 8 byte, up to 2 half-words of padding \texttt{0xaaaa} may be appended by the bridge.
Padding can be detected by considering the length information (in bytes, incl. all headers) stored in the first word of the sub-event header, i.e. the first word of payload in the transaction.
-\subsection{\change{Synchronisation with CBMNet}}
+\subsection{Synchronisation with CBMNet}
In order to express the TrbNet reference time in CBMNet time using a TDC the following approach is suitable:
For every physics trigger the CTS provides a reference time signal, that is distributed in the whole network using a dedicated physical line.
The arrival time of this signal gives the means to synchronise the system and gives a $T_0$ for each event .