Wire Train Bus Interface Module
EKE-Trainnet® Wire Train Bus (WTB) modules are used to create train-wide communication networks.
The EKE-Trainnet® WTB module implements the WTB link layer functions of the IEC 61375-2-1 Train Communications Network (TCN) standard. The TCN’s real-time protocols the UIC leaflet 556 specifications and the routing between the WTB and other buses are implemented by the gateway Central Processing Unit (CPU) module.
Key Features
The EKE-Trainnet® WTB Medium Attachment Unit (MAU) supports physical cable redundancy as specified in the IEC 61375-2-1 standard. It uses TCN standard’s Sub D-9 type connectors located on the front panel of the module. Communication to the gateway is done through a shared memory over the IEC 821 VME back plane bus. The WTB link layer functions are implemented by the WTB module’s local processor.
The EKE-Trainnet® WTB module is realised through the highly efficient combination of a dedicated microprocessor and FPGA logic. In addition to strict compliance with the IEC 61375-1 standard, the WTB module has the capability of carrying out enhanced diagnostics functions, like monitoring the bit error ratios between individual train coaches in order to identify communication issues.
The EKE-Trainnet® WTB module has a static shared RAM memory accessible from both the local CPU and the VME Bus interface. The TCN standard’s source and sink port handling for WTB process data is supported. A separate memory area is reserved for message data and maintenance messages as well as for Remote Procedure Call type access to the Link Layer primitives. The EKE-Trainnet® WTB module is able to provide applications with timing synchronisation when a Macro Period finishes.
In order to handle incompatible cabling or extremely harsh operating conditions, the WTB module is able to act as a bus repeater by completely regenerating the data streams towards both extremities. Intelligent repeater management is included in the WTB module’s system software. It supports the selection of an optimal number of concurrently enabled repeaters on the train bus, thus allowing the network timing to retain undegraded specifications.
Options
The EKE-Trainnet® WTB bus interface sustains fritting voltage. Fritting voltage source is available as an option: see EKE-Trainnet® WTF 2259B and WTF 2376B modules.
The EKE-Trainnet® WTB module is realised through the highly efficient combination of a dedicated microprocessor and FPGA logic. In addition to strict compliance with the IEC 61375-1 standard, the WTB module has the capability of carrying out enhanced diagnostics functions, like monitoring the bit error ratios between individual train coaches in order to identify communication issues.
