->The design concepts of modern data acquisition systems share many similar features. Among them are
->high bandwidth data transport, synchronization of front-ends and slow-control. This talk focuses
->on the achieved synergy in data acquisition networks between several experiments of the FAIR project
->and beyond. The TrbNet protocol developed for the upgrade of the HADES DAQ system is now also
->employed in various prototype set-ups for detectors of the CBM and PANDA experiments. Additionally,
->a modified implementation of the network is foreseen to be used for time synchronization and fast
->control system for the full PANDA detector setup.
+During the upgrade of the HADES experiment at GSI (Darmstadt, Germany) in the past years several new
+read-out electronics and data transportation developments were made. One part is the TrbNet data acquisition network protocol
+that allows for individual slow-control access to each front-end module and provides a convenient interface
+for trigger distribution and data read-out. A whole set of software for monitoring, control and
+data acquisition was designed on top and successfully used during an experimental run in 2012.
+The electronics developed for this upgrade are now in widespread use among several detector prototypes
+and experimental set-ups, e.g. for the CBM and PANDA experiments at FAIR. Here, the TrbNet protocol
+also serves as the read-out system.
-
-The synchronization of all sub-systems on the order of nanoseconds can be achieved by implementing
-message transportation with precisely defined latency. Here, it is vital to fix all delays
+In this context it was a logical decision to also adapt the network protocol to the specific needs of these
+experiments. One important difference is the time distribution concept that foresees to remove the need for a
+dedicated timing signal and thereby reduce the amount of interconnection inside the system. The
+optical data transmission system can support the synchronization of all sub-systems of a detector
+on the order of nanoseconds. This can be achieved by implementing message with precisely
+defined propagation latency. In particular, it is vital to fix all delays
introduced in the data transmission blocks on the transmitter and receiver sides. The length of the
optical cable between two nodes can be evaluated by measuring the round-trip time of a datagram.
-A precision of few nanoseconds down to 20~ps using the well-established FPGA-based TDC technology
-can be reached.
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+The measuring precision of few nanoseconds with synchronous counters can be increased to below 100~ps
+using the well-established FPGA-based TDC technology.
+
+All features have been implemented in the universal TRB3 FPGA platform. We are going to present the
+implemented features with a focus on the synergy between experiments and show first measurements with synchronous networks.
+
+