NM31 - Fully Managed 8-Port Railway Ethernet Switch with PoE

Maintenance Free and Extremely Rugged

The NM31 family is a range of 8-port fanless and maintenance-free managed Ethernet switches, developed specifically for rough environmental conditions in rolling stock applications.

High Speed, High Efficiency and Extensive Protocols

The 29 Gbit/s, TCAM based, store-and-forward switching matrix of the NM31 allows high-performance layer 2 switching over all connected interfaces. For easy remote management and access, layer 3 protocols, e.g., IPv4/IPv6 and DHCP, are integrated. The switch provides extended security features like SNMPv3, SSH and HTTPS. Traffic isolation (VLAN) and switching redundancy protocols (e.g., STP, RSTP, MSTP) provide safe running of the network using redundant data paths in the event of a fault. The ITU-T G.8031/G.8032 ring and linear protection switching feature set makes NM31 able to create network ring scenarios with recovery time under 50 ms. Monitoring and diagnosis functions, e.g., sFlow or SNMPv1, v2c, v3 are provided.

Versatile Application Possibilities

The NM31 range provide eight channels at the front panel, accessible through M12 connectors and cover different application requirements including with or without PoE+, IEEE802.3at type 1 and type 2 (previously af and at) compliant, and either 100 Mb or 1 Gb Ethernet interfaces.

Compliant to Railway Standards

The voltage supply for the NM31 Managed Ethernet Switch is designed for maximum flexibility and supports wide range input supply voltages from 14.4 V DC to 154 V DC, and meets all EN 50155 class S2 requirements for voltages ranging 24 V DC to 110 V DC.

Conduction Cooled

The NM31 is designed for fanless operation at temperatures ranging from -40 °C to +70 °C (10 min @ +85 °C). The NM31 features IP40 protection when mounted as specified and cooling fins which serve as a heatsink for the internal electronics, and in this way provides conduction cooling.

Familiar Family Concept

As a member of duagon's family of extremely rugged industrial box PCs, the NM31 provides the same flexibility and scalability, as well as a look and feel which is common to the family.


  • Fully managed 8-port rugged Ethernet switch
  • 10/100 (Fast) or 10/100/1000 Mbit/s variants
  • M12 A-, D- or X-coded
  • 29 Gbit/s carrier grade switching matrix
  • ITU-T G.8031/G.8032 Ethernet linear and ring protection switching
  • PoE+ Power Sourcing Equipment (PSE ), up to 60 W output power
  • Ultra-wide range rail power supply: 24 V DC to 110 V DC
  • -40 °C to +70 °C (+85 °C), fanless
  • Maintenance-free design
  • EN 50155 compliant (railways)