TTDP (IEC-61375-2-5)

Train topology is dynamic and frequently changes since cars are constantly added, removed, or
replaced. Every time the order of the train cars changes, the network must be reconfigured, which
is very time-consuming and prone to errors if it’s done manually.
TTDP (Train Topology Discovery Protocol) protocol has thus been developed to enhance the
efficiency of railway network reconfiguration. The protocol enables network switches to negotiate
automatically with other network devices after the network topology is changed and will assign an
IP address to the network devices based on the new order of train cars. IT staff or operators do not
need to reconfigure the network devices manually at all. With this technology, train operators can
vastly improve their operational efficiency and minimize configuration errors.

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