Rugged Industrial Gigabit Firewall / Router (GUARD-F12)

EN 50155 Class Tx certified Firewall / Router


The GUARD-F12 is EN50155 Class Tx certified for the use in railways applications. It is an expansion of the existing GUARD product range. The GUARD is designed by MPL to be used as Industrial Gigabit Firewall and VPN Router. The GUARD-F12 comes with 3 Fast Ethernet interfaces and with M12 connectors, ready for industrial and railways applications. The specifically designed GUARD housing allows to operate the Firewall in harsh environments without the need of fans or ventilation holes and can easily be mounted on a 35mm DIN rail, in a rack, or on a wall. The compact housing offers sufficient space to add other peripherals. The GUARD-F12 can be customized for customer specific applications or uses.

The operating temperature range is from -20°C to +60°C and optionally even -40°C to +85°C without fan or case openings. The internal miniPCIe slot allows various extensions (WLAN, GPRS...). Additionally available is an external USB connector and a microSD Memory Card slot for easy logging and/or configuration capabilities.

Technical Features

Board Key Data
Processor RISC SoC 1.2GHz Low Power CPU
Memory 512MByte DDR2 Soldered OnBoard
Firmware 512MByte NAND Flash Soldered OnBoard
3 x Ethernet 10BaseT / 100BaseTX (optional 1000BaseTX) 3 x M12 connector, auto negotiation, auto MDI MDIX
1 x USB2 (optional) 1 external port Type A connectors, ESD protected
1 x microSD (optional) For microSD Memory Card Can be used as external storage (configuration, logging)
Mini PCI-Express WLAN, GPRS, UMTS or similar expansions Minicard Slot
Physical / Power
Chassis Compact rugged chromated Aluminum
with stainless steel plates
DIN-rail or flange mounting, no ventilation holes
Size & Weight 62.1 x 162.1 x 118mm 0.94kg / 2lb including housing
Power 8 - 36VDC Power consumption <9W, reverse polarity protection
Temperature Range -20C up to +60C optionally -40C to +85C No fan, no openings, values at full CPU load
Humidity 5% - 95% non-condensing Optional coating available
Standard Compliance
The GUARD-F12 is designed to meet or exceed the most common standards. Particular references are:
EMC EN 55022, EN 55024, EN 61000, MIL-STD-461E
Shock & Vibration EN 60068
Environmental & Safety EN 50155 certified, MIL-STD-810-F, EN 60601, EN 60950

The GUARD-F12 comes preinstalled with an adapted version of OpenWRT ( This Linux based embedded distribution provides all functionality required for operation as IPV4 and/or IPV6 firewall and router. Most of the configuration of the firmware installed can be done using a web based interface. For more specialized requirements, a console based configuration utility is available.

Functions and protocols:
  • TCP/IP V4 and V6
  • Ipsec
  • QOS (Quality Of Service) capable
  • Miredo/Teredo (IPV6 over IPV4 tunneling)
  • PPP (Point-to-Point Protocol)
  • Network address translation
  • Multi WAN Setup (failover and load balancing)
  • DHCP Server for IPV4 and IPV6
  • DNS server/forwarder
  • Support for dynamic DNS providers
  • OpenVPN support
  • OpenConnect client support
  • Firewall based on linux iptables
  • SSH and telnet device access
  • Snort (lightweight intrusion detection)
  • Avahi (aka RendezVous/Bonjour/ZeroConf) support

  • Wall mounting instead of DIN-Rail
  • Heavy duty housings (MIL IP67) with MIL connectors
  • GigE support
  • Extended temperature / coating
  • Customized versions and expansions

GUARD-F12 Versions

Reference Description
GUARD-F12 Rugged Industrial Firewall/Router with 3 Fast Ethernet ports on M12 connectors, pre-installed OpenWRT embedded Linux distribution. For Railways with EN50155 Class Tx Certificate.
GUARD-Cx GUARD Solution assembled & mounted according the customer needs & requirements (e.g. with special housing, depopulated parts, installing a customers application, ....)

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