Hirschmann Automation and Control Gmbh

Stephan Kehrer

Florian Mueck

Rene Hummen

Zbigniew Pelzer

Martin Wendt

René Hummen

Florian MÜCK

End-to-end latency in a data network containing a succession of network devices through which a data packet passes via data connections is determined by first providing the data packet with a trigger packet. Then each device generates and adds to the trigger packet a respective reception timestamp indicating when the packet is received by the respective device. This added data indicates time needed for travel from the immediately upstream network device such that, when reaching the furthest downstream device of the succession of network devices, the trigger packet holds a plurality of timestamp representing when the trigger packet was received by the network devices. Finally the end-to-end latency is calculated at the furthest downstream network device from all of the time stamps in the trigger packet.

Determining required processing time of a data network

The invention relates to a method for operating a network, wherein the network comprises a plurality of network devices having ports, the network devices being connected to one another for transmitting data via cables which are each inserted into a respective port, wherein each port has signaling means which can be switched between at least two signaling states. The invention is characterized in that all signaling means of those ports of the network devices, which have the same configuration, are brought into an associated detectable signaling state.

VLAN port signaling

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Dusslingen, Germany

Stephan Kehrer