D522 - WTB to Ethernet Gateway

The D522 is a WTB to Ethernet Gateway compliant to IEC 61375 and UIC Leaflet 556. The gateway is built with two WTB medium attachment units. Line A and B interfaces are galvanically isolated, enabling cable redundancy, and use standard 9-pole SUB-D type connectors. To overcome contact oxidation, the WTB gateway has an optional built-in fritting mechanism. The integrated WTB controller, realised in an FPGA with duagon IP, can be configured to act as a strong or weak master or as a slave.

The gateway is delivered with a build-in UIC 556 conform mapping server application, handling message data communication and process data marshalling between the WTB and the Ethernet consist network. Safe data communication can be enabled in the application configuration. A complete configuration and integration toolchain is provided, including a configuration tool, to easily configure the application and allowing the gateway to be seamlessly integrated into any network architecture.

The integrated Ethernet controllers, designed by duagon, feature hardware prioritisation and very low jitter. Different real-time protocol stacks are available to fulfil the requirements for Ethernet applications in railways.

The Ethernet interface is fully compliant to IEEE 802.3 and supports features like Auto-Polarity, Auto-Negotiation and Auto- MDI-X. It complies with IEEE 802.3 and the internal logic is prepared for the future "Ethernet on traction vehicles" standard IEC 61375-3-4.

The D522's 8 digital inputs and 8 combined input/output channels. The I/O channels are used by the application to implement battery voltage monitoring, redundancy switch over and a "wake-up" signal.

The WTB gateway is connected directly to the train battery and support all voltage types from 24 to 110 Vdc. Moreover, it has a built-in power save mode.


  • Fritting without additional DC/DC converters
  • Configurable strong master, weak master and slave node
  • Cable redundancy Line A and Line B
  • Comparably small form factor
  • Complies with EN 50155, EN 50121 and IEC 61375 standards, and is designed for harsh rolling stock environment