EN 50155 routing switch


The Viper-212 is a managed 12 port routing switch designed to meet the full requirements of the rail vehicle market. The incredibly compact and robust housing ensures the unit can be built into tight and environmentally hostile spaces. The Westermo WeOS operating system provides an extensive suite of IP networking standards allowing resilient and flexible networks to be created, meeting the needs of the rail market.

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As is critical for all equipment to be installed in rail vehicles, the Viper has been externally tested across the complete spectrum of standards required by EN 50155.

Westermo understand that systems on railcars are required by the EN 50155 standard to have a useful life of 20 years, so as well as using the highest quality components to deliver extended MTBF figures, we also implement features like the GORE-TEX® membrane in the IP67 enclosure to prevent water build up in the units. Due to the high vibration environment of the rail industry, we have also developed the Viper case with integral threading for the M12 connectors to ensure the IP67 seal is maintained for the life of the product.

The EN 50155 standard requires mandatory performance and isolation testing. Not only does Westermo meet these, we exceed them in order to meet the additional manufacturer requirements for train control. Westermo’s Swedish factory has been building Ethernet switches for the railcar market for many years and fully understands the measures that are required to provide the highest quality manufactured solutions.

Meeting the requirements of the railcar environment, makes the Viper very well suited for deployment in any application with severe operating conditions and extreme environments.


Technical data


Product description
Article number3641-0560
Ports12 x 10/100BaseTX, M12 contact
1 x USB 2.0 host interface
1 x RS-232, 115.2 kbit/s
DescriptionEN 50155 Routing Switch
Warranty period5 Years
Standard compliance
EnvironmentalEN 61373:1999, Railway applications – Rolling stock equipment. Shock and vibration tests
IEEE1478:2001, Environmental conditions for transit rail car electronic equipment
EN 50124-1: 2001+A1:2003+A2:2005, Railway applications – Insulation coordination
Fire safety standard CEN 45545-2
Reliability prediction
MTBF, operating554 000 h (MIL-HDBK-217F (Gb) 25°C)
Service life, operating15 years
EMC (Electromagnetic Compatibility)
EN 61000-6-1Immunity residential environments
EN 61000-6-2Immunity industrial environments
EN 61000-6-3Emission standard for residential, commercial and light-industrial environments.
EN 61000-6-4Emission industrial environments
EN 55022 +A1Emission IT equipment
EN 55024Immunity IT equipment
FCC part 15Class B
EN 50121-4Railway signaling and telecommunications apparatus
EN-50121-3-2Railway applications –Rolling stock – apparatus
EN-50155Railway applications – Electronic equipment used on rolling stock
IEC 62236-4Railway signaling and telecommunications apparatus
EMC specifications
EN 61000-4-2, ESDEnclosure:
Contact: ±6 kV
Air: ±8 kV
EN 61000-4-4, fast transientsPower port, ±5 kV
Signal ports, ±5 kV
Earth port, ±1 kV
EN 61000-4-5, surgePower port:
L-E: ±0.5 kV, 12 Ω, 9 μF, 1.2/50 μs
L-L: ±0.5 kV, 2Ω, 18 μF, 1.2/50 μs
L-E: ±2 kV, 42 Ω, 0.5 μF, 1.2/50 μs
L-L: ±2 kV, 42Ω, 0.5 μF, 1.2/50 μs
L-E: ±8.4 kV, 100 Ω, 0.05/0.1 μs
L-L: ±8.4 kV, 100 Ω, 0.05/0.1 μs
Ethernet ports:
L-E: ±1 kV, 2 Ω L-E: ±2 kV, 42Ω, 0.5 μF
EN 61000-4-8, power frequency magnetic fieldEnclosure, 300 A/m; 0, 16.7, 50, 60 Hz
EN 61000-4-9, pulsed magnetic fieldEnclosure, 300 A/m
IEC 61000-4-3, RF field AM modulatedEnclosure, 20 V/m @ (80 MHz – 2.7 GHz), 1 kHz sine, 80% AM
EN 61000-4-6, conducted RF immunityPower port, 10 V, 80% AM, 1 kHz; (0.15 – 80) MHz
Ethernet ports, 10 V, 80% AM, 1 kHz; (0.15 – 80) MHz
Earth port, 10 V, 80% AM, 1 kHz; (0.15 – 80) MHz
EN 55022, radiated RF emissionEnclosure, class B
Power port, class B
Ethernet ports, class B
FCC part 15, radiated RF emissionEnclosure, class B
EN 60950-1, dielectric strengthPower port to all other ports, 1.5 kV ACrms, 50 Hz, 1 min
Ethernet ports to all other ports, 1.5 kV ACrms, 50 Hz, 1 min
SafetyEN 60950-1, IT equipment
Temperature, operating–40 to +70°C (–40 to +158°F)
Temperature, storage–50 to +85°C (–58 to +185°F)
Humidity, operating5 to 95 % relative humidity
Humidity, storage5 to 95 % relative humidity
EnclosureZinc, fire enclosure.
Dimensions (W x H x D)175 x 62.5 x 100 mm (6.9 x 2.5 x 3.9 in)
Weight1.4 kg
Degree of protectionIP67
MountingWall mounted
IEC 60068-2-6, vibrationNon operating long life simulation, 7.9 m/s² (RMS) 5 – 150 Hz
Vibration, random functionalOperating, 1 m/s² (RMS) 5 – 150 Hz
IEC-60068-2-27, shockOperating, 5 g, 30 ms
IEC 60068-2-27, bumpOperating, 10 g, 11 ms
Interface specifications, power
Operating voltageRated: 24 to 110 VDC Operating: 24 to 110 VDC ± 30%
Operating for 100 ms: 24 to 110 VDC ±40%
Rated current350 mA @ 24 V and 90 mA @ 110 V
Rated frequencyDC
Inrush current1 mA²s @ 24V and 6 mA²s @ 110V
Startup current400 mA
PolarityReverse polarity protected
Redundant power inputYes
Isolation to1500 VAC rms to all other
Connection4 pin male M12 A-coded connector, use Westermo cable
3146-1106 for 1.5 m
3146-1107 for 5 m
Connector sizeM12, recommended cable area 0.5 mm² recommended (minimum 0.25 mm²), cable dimensions depend on choice of M12 connector
Interface specifications, 10/100BaseTX
Electrical specificationIEEE IEEE std 802.3. 2005 Edition
Data rate10 Mbit/s, 100 Mbit/s, manual or auto
DuplexFull or half, manual or auto
Circuit typeTNV-1
Transmission rangeUp to 150 m with CAT5e cable or better
Isolation toOther Ethernet ports, 1500 VAC rms
USB and CON or SRV1 and SRV2, 1500 VAC rms
DC, 1500 VAC rms
Connection4-pin M12 D-code, auto MDI/MDI-X, use e g Westermo cable
3146-1100 M12-M12 – 1 m
3146-1101 M12-M12 – 5 m
3146-1103 RJ45-M12 – 1 m
3146-1104 RJ45-M12 – 5 m
Shielded cableNot required, but recommended in severe electromagnetic environments
Conductive housingYes
Number of ports12
Interface specifications, USB
Electrical specificationUSB 2.0 host interface
Data rateUp to 480 Mbit/s (high-speed mode)
Maximum supply current500 mA
Circuit typeSELV
Isolation toEthernet ports, 1500 VAC rms
DC, 1500 VAC rms
No isolation to CON
Connection5-pin M12 female A-code, use Westermo USB plug 3641-0190
Interface specifications, console
Electrical specificationRS-232
Data rate115.2 kbit/s
Data format8 data bits, no parity, 1 stop bit, no flow control
Circuit typeSELV
Isolation toEthernet ports, 1500 VAC rms
DC, 1500 VAC rms
No isolation to USB
Connection5-pin M12 female B-code, use Westermo cable 1211-2215



Protocols and functionality
Resiliency and high availabilityFast Reconfiguration of Network Topology (FRNT)
FRNT ring coupling
Multilink dual homing
IEEE 802.1D (STP) and IEEE 802.1w (RSTP)
IEEE 802.1AX/802.3ad Link Aggregation
Layer 2 switchingIEEE 802.1Q Static VLAN and VLAN Tagging
IEEE 802.3x Flow Control
IGMPv2/v3 snooping
AVT Dynamic VLAN (Adaptive VLAN Trunking)
Management VLAN (Management Interface concept)
Static Multicast MAC filters
Layer 2 QoSIEEE 802.1p Class of Service
Layer 2 securityIEEE 802.1X Port Access Control
MAC Authentication
IP routing, cyber security, firewall and VPNStatic IP routing
Dynamic IP routing
• OSPFv2
• RIPv1/v2
• Robust VRRP
• Static Multicast Routing
Stateful Inspection Firewall
• NAT and 1-1 NAT, Proxy ARP for 1-1 NAT
• Port Forwarding
IKEv1, certificates and PSK
• IKEv1
• VPN failover
Loopback Interface
ManageabilityManagement tools
• Web interface (HTTP and HTTPS or CLI (SSHv2 or Telnet)
• SNMPv1/v2c/v3
• Flexible management of configuration and log files
Flexible alarm/event handling system
USB Fluid configuration (Available for products with USB port)
Digital I/O and Flexible alarm/event handling system
Syslog (log files and remote syslog server)
Port Monitoring
SNTP (NTP client)
PPPoE client
DHCP client
DHCP server including option 82
DHCP relay agent including option 82
SNMP MIB supportRFC1213 MIB-2
RFC2863 Interface MIB (ifXTable)
RFC2819 RMON MIB (etherStatsTable)
RFC4188 Bridge MIB
RFC4133 Entity MIB (entityPhysical)
RFC3433 Entity Sensor MIB
RFC3621 Power Ethernet MIB

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EN 50155 routing switch