Gigabit Ethernet Integrated Train Backbone Node 

Train Backbone Node


GbE Integrated TBN

  • Switch/ Router
  • Compliant with IEC 61375 standard protocols
  • Full IEC 61375-2-3 compliance
  • Compliant with EN 50155 standard
  • TRDP interface protocol for end devices

Backbone side

  • 4 x GbE ports protected by hardware bypasses
  • Fully compliant with IEC 61375 TTDP protocol
  • 2 hardware bypasses
  • R-NAT (railway 1:1 NAT)
  • Router Redundancy Protocol
  • Dynamic routing following train inauguration
  • Train-wide standard multicast routing

Consist side

  • 2 x GbE ports + 8 x FE ports
  • 1 bypass optional
  • PoE+ option available

The Integrated Ethernet Train Backbone Node (IETBN) is a perfect combination of an IEC standard Train Backbone Node implementation with a multi-port Ethernet Consist Switch. Due to this mix of backbone and consist ports, it provides an integrated and cost-sensitive solution.
Double switched backbone lines protected by a bypass relay ensure high levels of fault tolerance also in the case of a power failure. A couple of TBN can be used together using an active/passive redundant configuration to obtain the maximum level of protection. GbE ports are available for higher bandwidth requirements.

The Integrated ETBN can be powered from 24 Vdc to 110 Vdc nominal. Fully EN 50155 compliant, this device provides the highest level of reliability and robustness required by the railway industry.

Backbone side

Through the TTDP protocol, IEC Train inauguration procedure is fully supported. Routing and address translation rules (R-NAT) for multiple consist networks interconnections are automatically defined during train inauguration as well as TRDP interface. Full communication compliance with TRDP End Devices, as well as with IEC 61375-3-2 TCN communcation profile is ensured.      

Consist side

On the consist side, VDS Tools provide automatic device configuration and continuous monitoring giving the customer a way to reduce commissioning and maintenance costs. Eight (8) ports can be optionally equipped with PoE+.

Main technical specifications

  • IEEE Standard Physical layer :IEEE 802.3 10BASE-T, IEEE 802.3u 100BASE-TX, IEEE 802.3ab 1000BASE-T
  • IPv4 protocol supported (IPv6 protocol ready)
  • Spanning tree (STP 802.1D) and Rapid Spanning Tree (RSTP 802.1w)
  • Link aggregation protocol (LACP 802.3ad)
  • Up to 4096 802.1Q VLANs
  • DHCP option 82 handling
  • IGMP versions 1, 2 and 3 snooping
  • SNMP v1, v2c, v3 device management
  • Static IPv4 unicast and multicast routing
  • OSPF and RIP dynamic routing protocols
  • Network Address Translation (SNAT, DNAT and R-NAT)
  • Packets filtering 
  • Router Redundancy Protocol
  • Dynamic routing following train inauguration
  • Train-wide standard multicast routing  

Physical data

  • Connector type: M12
  • Power supply: From 24 Vdc up to 110 Vdc
  • Power supply class: S2, according to EN-50155
  • Power consuption: 22 W max
  • PoE budget: 60 W
  • Overall dimensions: 207 x 184 x 51 mm (no PoE), 207 x 184 x 73 mm (with PoE)
  • Weight: 2 Kg (no PoE), 2,6 Kg (with PoE)
  • Operating temperature: From -40°C up to +85 °C according to EN-50155
  • Storage temperature: 0/95%
  • Degree of protection: IP40, IP54; IP65

Main approvals/compliance

  • EN 50155: Railway Applications (Electronic equipement used on rolling stock)
  • EN 61373: Shock & Vibration
  • EN 45545: Fire & Smoke
  • IEEE 802.3: Ethernet Network Standard