Westermo Viper 3512 Series User Guide
This guide provides information for installation engineers and users of Westermo products, including safety, regulations, product description, installation instructions, and technical specifications.
1. General Information
The contents of this document are provided "as is". Westermo reserves the right to revise this document at any time without prior notice. Westermo shall not be responsible for any loss of data or income or any special, incidental, and consequential or indirect damages.
More information about Westermo can be found at www.westermo.com.
1.3. Software Tools
Related software tools are available at https://www.westermo.com/support/product-support.
1.4. License and Copyright for Included FLOSS
This product includes software developed by third parties, including Free/Libre Open Source Software (FLOSS). Please visit the product web page for more information.
1.5. WeOS
This product runs WeOS (Westermo Operating System). Instructions for quick start, configuration and factory reset are found in the WeOS user documentation at www.westermo.com.
1.6. Integrity Seal
An integrity seal ensures the product package has not been opened. If the seal is unexpectedly broken or missing, contact your support channel.
2. Safety and Regulations
2.1. Warning Levels
| Level of warning | Description | Consequence personal injury | Consequence material damage |
|---|---|---|---|
| ⚠ WARNING | Indicates a potentially hazardous situation | Possible death or major injury | Major damage to the product |
| ⚠️ CAUTION | Indicates a potentially hazardous situation | Minor or moderate injury | Moderate damage to the product |
| ℹ️ NOTICE | Provides information in order to avoid misuse of the product, confusion or misunderstanding | No personal injury | Minor damage to the product |
| ℹ️ NOTE | Used for highlighting general, but important information | No personal injury | Minor damage to the product |
2.2. Safety Information
Before installation, read this manual completely and ensure your application does not exceed the safe operating specifications for the product.
SAFETY DURING INSTALLATION: The product must be installed and operated by qualified service personnel in an apparatus cabinet or similar, where access is restricted to service personnel only.
Before energising and connecting communication cables, ensure a protective earthing conductor is connected to the protective earthing terminal. Westermo recommends a cross-sectional area of at least 4 mm².
HAZARDOUS VOLTAGE: Do not open an energised product. Hazardous voltage may occur when connected to a power supply.
PROTECTIVE FUSE: The power supply wiring must be sufficiently fused with a fuse certified to IEC 60127 and rated for T1.6 A and 250 V. Ensure compliance to national installation regulations. This product has no internal fuse and should be connected via an external fuse for protection.
REDUCE THE RISK OF FIRE: Use only telecommunication line cords with a cable diameter of AWG 26 or larger.
CABLE TEMPERATURE RATING FOR FIELD TERMINAL WIRES: Refer to chapter Interface Specifications for minimum temperature rating.
ELECTROSTATIC DISCHARGE (ESD): Prevent electrostatic discharge damage by discharging your body to a grounding point (e.g., use a wrist strap).
HOT SURFACE: Be aware that the surface of this product may become hot. When operated at high temperatures, the external surface may exceed the Touch Temperature Limit.
NOTE - MECHANICAL FORCE ON VENTILATION MEMBRANE: Do not cover or bring mechanical force to the ventilation membrane on the back of the product.
2.3. Care Recommendations
- Do not drop, knock or shake the product.
- Use a dry or slightly water-damp cloth to clean the product. Do not use harsh chemicals, cleaning solvents or strong detergents.
- Do not paint the product.
If the product is not working properly, contact the place of purchase, the nearest Westermo distributor office or Westermo technical support.
2.4. Product Disposal
The WEEE symbol [♻️] indicates that the product shall not be treated as unsorted municipal waste. It needs to be handed over to an applicable collection point for recycling electrical and electronic equipment.
2.5. Compliance Information
2.5.1. Agency Approvals and Standards Compliance
| Type | Approval/Compliance |
|---|---|
| Climate | EN 50155 class OT4 / IEC 60571 class TX, Railway applications - Electronic equipment used on rolling stock; IEEE 1478 class 1, condition E4 (incl Salt Mist), Environmental conditions for transit rail car electronic equipment |
| EMC | EN/IEC 61000-6-2, Immunity industrial environments; EN/IEC 61000-6-4, Emission industrial environments; EN 50121-4/IEC 62236-4, Railway signalling and telecommunications apparatus; EN 50121-3-2/IEC 62236-3-2 Railway applications - Rolling stock - apparatus; Tested and verified for Class S1, DB EMC Regulation 06, Commodity team Radio compatibility in VDB Rev 1.0 (Shunting Radio); Tested and verified for FCC part 15b class A (CFR 47); E-Mark, Road Vehicles, E1 10R-058547 |
| Mechanical (Shock and vibration) | EN 61373 category 1, class A and B; EN 60068-2-27 20 g, 11 ms and 100 g, 6 ms |
| Insulation (Coordination and test) | EN 50124-1, Railway applications – Insulation coordination; EN 50155/IEC 60571, Railway applications - Electronic equipment used on rolling stock |
| Fire protection | EN 45545-2, Fire protection on railway vehicles; NFPA 130, Fire protection for fixed guideway transit and passenger rail system |
| Cybersecuritya. Software | IEC 62443-4-2 SL2, Security for industrial automation and control systems; EN 50657:2017 Software Onboard Rolling Stock (Basic Integrity) |
| Safety | EN/IEC/UL 61010-1, -2-201, Safety requirements for electrical equipment for measurement, control, and laboratory use |
a.Certification ongoing
2.5.2. EN/IEC/UL 61010-2-201 Notice
This product has been tested and found compliant to EN/IEC/UL 61010-2-201, Safety requirements for electrical equipment for measurement, control, and laboratory use. This product shall be handled by skilled service personnel.
2.5.3. FCC Part 15.105 Class A Notice
This product has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the product is operated in a commercial environment.
2.5.4. Simplified Declaration of Conformity
Westermo declares that this product is in compliance with applicable EU directives and UK legislations. The full declaration of conformity and other detailed information is available at www.westermo.com/support/product-support.
The European Conformity [CE] and the UK Conformity Assessment [UKCA] markings are shown.
3. Product Description
3.1. Product Description
The Viper 3512 series consists of managed 12 port routing switches optimized for the needs of the railway rolling stock market. Gbps ports handle high bandwidth devices such as access points and Network Video Recorders (NVRs).
The Viper 3512 series is designed to withstand tough onboard train environments, including constant vibration, extreme temperatures, humidity, and demanding electrical conditions. A GORE-TEX® membrane prevents internal condensation, and integrated threading in the chassis provides additional vibration resistance. High-level isolation between interfaces enables direct connectivity to vehicle auxiliary power and protects against overvoltage and flashover. IP67 protection prevents ingress of water and dust. The optimized design results in a compact package with a very high Mean Time Between Failures (MTBF) for easy integration and low lifecycle cost.
Type testing at independent ISO/IEC 17025 and ILAC MRA certified labs confirms the Viper series fulfills EN 50155 and other requirements.
The WeOS operating system offers extensive IP networking features for resilient and flexible networks, including the FRNT ring protocol with fast failover. The powerful layer 3 routing capability is useful for separating networks in complex applications. A backup device accessory matches the Viper's robustness and offers easy configuration update and backup.
The Viper 3512 series is well-suited for deployment in any application with severe operating conditions and tough environments, such as the mining industry.
3.2. Available Models
All switches are managed. Viper 3512 refers to both layer 2 and layer 3 models.
| Art. no. | Model | SW | Gbps ports |
|---|---|---|---|
| 3635-0015 | Viper-3512-T12 | Layer 2 | - |
| 3635-0315 | Viper-3512-T3G-T9 | Layer 2 | 3 |
| 3635-0615 | Viper-3512-T5G-T7 | Layer 2 | 5 |
| 3635-0025 | Viper-3512-E-T12 | Layer 3 | - |
| 3635-0325 | Viper-3512-E-T3G-T9 | Layer 3 | 3 |
| 3635-0625 | Viper-3512-E-T5G-T7 | Layer 3 | 5 |
3.3. Hardware Overview
The product features the following ports and indicators:
- 1. LED indicator
- 2. 100 Mbps port
- 3. Gbps port
- 4. Power connection
- 5. Console port
- 6. Protective earth connection
- 7. USB port
A diagram shows the location of these interface ports and LED indicators.
ℹ️ NOTE - MECHANICAL FORCE ON VENTILATION MEMBRANE: Do not cover or bring mechanical force to the ventilation membrane on the back of the product.
3.4. Connector Pinout
Power connector, male, A-coded
| Pin no. | Signal |
|---|---|
| 1 | +DC1 |
| 2 | +DC2 |
| 3 | -COM |
| 4 | -COM |
The product supports redundant power connection. The positive inputs are +DC1 and +DC2. The negative input for both supplies is -COM.
Console connector, female, B-coded
| Pin no. | Signal |
|---|---|
| 1 | NCa |
| 2 | TX |
| 3 | RX |
| 4 | NCa |
| 5 | GND |
aNo Connect. Do not connect.
USB connector, female, A-coded
| Pin no. | Signal |
|---|---|
| 1 | DN |
| 2 | VBUS |
| 3 | NCa |
| 4 | DC |
| 5 | GND |
aNo Connect. Do not connect.
100 Mbps Ethernet connector, female, D-coded
| Pin no. | Signal |
|---|---|
| 1 | TD+ |
| 2 | RD+ |
| 3 | TD- |
| 4 | RD- |
MDI, MDI-X and auto MDI/MDI-X modes are supported. The table shows signals in MDI mode.
Gbps connector, female, X-coded
| Pin no. | Signal |
|---|---|
| 1 | DA+ |
| 2 | DA- |
| 3 | DB+ |
| 4 | DB- |
| 5 | DD+ |
| 6 | DD- |
| 7 | DC- |
| 8 | DC+ |
3.5. LED Indicators
| LED | Status | Description |
|---|---|---|
| ON | OFF | Product has no power |
| GREEN | All OK, no alarm condition | |
| RED | Alarm condition, or until product has started up. (Alarm conditions are configurable, see WeOS4 Management Guide) | |
| BLINK | Location indicator ("Here I am!"). Activated when connected to WeConfig tool, or upon request from web or/and CLI. RED BLINK during boot indicates pending cable factory reset. | |
| RSTP | OFF | RSTP disabled |
| GREEN | RSTP enabled | |
| BLINK | Product selected as RSTP/STP root switch | |
| FRNT | OFF | FRNT disabled |
| GREEN | FRNT OK | |
| RED | FRNT error | |
| FLASH | Product configured as FRNT focal point | |
| OFF | Product has no power | |
| DC | GREEN | Power OK on DC1 and DC2 |
| RED | Power failure on DC1 or DC2 | |
| OFF | No link | |
| X1 to X12 | GREEN | Link established |
| GREEN FLASH | Data traffic indication | |
| YELLOW | Port alarm, or port is set in blocking state by link redundancy protocol |
3.6. Dimensions
Dimensions are stated in mm.
A dimensional drawing shows the product's dimensions: Width 164 ±0.5 mm, Height 56 ±0.3 mm, Depth 175 mm. Mounting holes are shown with dimensions.
4. Installation
4.1. Wall Mounting
The product can be wall mounted vertically or horizontally using four pieces of 7 mm bores. Use four M5, M6 or 1/4" screws with 12 mm washers on a flat and stable surface.
A diagram illustrates wall mounting.
4.2. Protective Earth Connection
For correct function, the earth connection needs to be properly connected to a designated PE rail. Torx: T25 and torque: 3.2 Nm.
A diagram shows the earth connection.
4.3. Connection of Cables
Recommended tightening torque for the M12 connectors is 0.6 Nm. All M12 connections are screw connections.
When connecting the power cable, ensure that the pins are connected correctly before tightening the power cable to the unit.
⚠ PROTECTIVE FUSE: The power supply wiring must be sufficiently fused. The fuse must be IEC 60127 certified and rated for T1.6 A and 250 V. It must be possible to disconnect manually from the power supply. Ensure compliance to national installation regulations. This product has no internal fuse and should be connected via an external fuse for protection.
ℹ️ NOTE - UNUSED CONNECTORS: Unused connectors must be covered by a protective cap, tightened to the specified torque to fulfill the specified ingress protection code.
4.4. Cooling
This product relies on convection cooling. Ensure installation allows for adequate airflow and that the ambient temperature is within the specified range.
4.5. Replacement of Product
Disconnect all cables and unscrew the product. Mount the replacement product and reconnect all cables, observing the instructions in Connection of Cables. For easy replication of the configuration, it is recommended to have the Westermo USB plug permanently connected to the USB port and move it over to the replacement product before it is powered up.
MTTR (Mean Time To Repair) is less than 10 minutes.
⚠️ HOT SURFACE: Be aware that the surface of this product may become hot. When operated at high temperatures, the external surface may exceed the Touch Temperature Limit.
4.6. EN 45545-2 Mounting Notes
Two products can be mounted together as a single interior non-listed group according to EN 45545-2 definitions. For multiple products, spacing requirements for interior non-listed groups must be met.
5. Specifications
5.1. Interface Specifications
DC, Power port
| Rated voltagea | 24 to 110 VDC |
| Operating voltageb | 16.8 to 143 VDC (14.4 VDC to 100 ms and 154 VDC for 1 s) |
| Rated current | Max 580 mA at 24 VDC, max 140 mA at 110 VDC |
| Rated frequency | DC |
| Inrush current | 80 mA²s at 24 VDC, 140 mA²s at 110 VDC |
| Startup current | Max 840 mA at 16.8 VDC |
| Polarity | Reverse polarity protected |
| Redundant power input | Yes |
| Isolation | To all other ports |
| Circuit type | Secondary circuit hazardous voltage, OVC II |
| Connector | 4-pin, male, M12, A-coded, recommended Westermo cables: 3146-1106 for 1.5 m, 3146-1107 for 5 m |
| Cable size | M12, recommended power cable area 0.5 mm² (minimum 0.25 mm²), which correlates to AWG 21 or larger. Cable dimensions depend on choice of M12 connector. |
| Cable temperature rating | For minimum temperature rating of the cable to be connected to the field wiring terminals: -40 to +70 °C |
aAlso referred to as nominal voltage in EN/IEC/UL 61010-1
bAlso referred to as nominal voltage in EN/IEC/UL 61010-1
100 Mbps ports
| Electrical specification | IEEE std 802.3 |
| Data rate | 10 Mbps, 100 Mbps, manual or auto |
| Duplex | Full or half, manual or auto |
| Circuit type | TNV-1 |
| Transmission range | Up to 150 m with CAT5e cable or better |
| Isolation | To all other ports |
| Connector | 4-pin, female, M12, D-coded, auto MDI/MDI-X, recommended Westermo cables: 3146-1100 M12-M12-1m, 3146-1101 M12-M12-5m, 3146-1103 RJ45-M12 - 1 m, 3146-1104 RJ45-M12-5 m |
| Cabling | Shielded cable CAT5e or better is recommended |
| Conductive chassis | Yes |
| FRNT reconfiguration time | Typically below 20 ms |
a100 Mbps ports are: X1-X12 on Viper-3512(-E)-T12; X1-X3, X5-X7, X9-X11 on Viper-3512(-E)-T3G-T9; X1, X5-X7, X9-X11 on Viper-3512(-E)-T5G-T7
Gbps ports
| Electrical specification | IEEE std 802.3 |
| Data rate | 10 Mbps, 100 Mbps, 1000 Mbps, manual or auto |
| Circuit type | TNV-1 |
| Duplex | Full or half, manual or auto |
| Transmission range | Up to 100 m with CAT5e cable or better |
| Isolation | To all other ports |
| Connector | 8-pin, female, M12, X-coded |
| Cabling | Shielded cable CAT5e or better is recommended |
| Conductive chassis | Yes |
| FRNT reconfiguration time | Typically below 20 ms |
aGbps ports are: X4, X8, X12 on Viper-3512(-E)-T3G-T9, X2-X4, X8, X12 on Viper-3512(-E)-T5G-T7
USB port
| Electrical specification | USB 2.0 host interface |
| Data rate | Up to 480 Mbps (high-speed mode) |
| Maximum supply current | 200 mA |
| Circuit type | SELV |
| Isolation | To all Ethernet and DC ports; No isolation to CON or protective earth |
| Connector | 5-pin, female, M12, A-coded, recommended Westermo USB plug 3641-0190 |
Console port
| Electrical specification | RS-232 |
| Data rate | 115.2 kbit/s |
| Data format | 8 data bits, no parity, 1 stop bit, no flow control |
| Circuit type | SELV |
| Isolation | To all Ethernet and DC ports; No isolation to USB or protective earth |
| Connector | 5-pin, female, M12, B-coded, recommended Westermo cables: 1211-2215 (serial port) or 1211-4073 (USB) |
5.2. Type Tests and Environmental Conditions
| Environmental phenomena | Basic standard | Description | Test levels |
|---|---|---|---|
| ESD | EN 61000-4-2 | Enclosure | Contact: ±6 kV; Air: ±8 kV |
| Fast transients | EN 61000-4-4 | Power port | ± 2 kV |
| Signal ports | |||
| Earth port | |||
| Surge | EN 61000-4-5 | Power port | L-E: ± 2 kV, 42 Ω, 0.5 µF, 1.2/50 µs; L-E: ± 1 kV, 12 Ω, 9 µF, 1.2/50 µs; L-L: ± 2 kV, 42 Ω, 0.5 µF, 1.2/50 µs; L-L: ± 0.5 kV, 2 Ω, 18 µF, 1.2/50 µs |
| Ethernet port | L-E: ± 2 kV, 2 Ω | ||
| Pulsed magnetic field | EN 61000-4-9 | Enclosure | 300 A/m |
| Radiated RF immunity | EN 61000-4-3 | Enclosure | 20 V/m at (80 MHz to 2 GHz) 10 V/m at (2-6 GHz) 1 kHz sine, 80% AM |
| Conducted RF immunity | EN 61000-4-6 | Power port | 10 V, 80% AM, 1 kHz; (0.15-80) MHz |
| Ethernet ports | |||
| Earth port | |||
| Radiated RF emission | CISPR 16-2-3 ANSI C63,4 (FCC Part 15) | Enclosure | EN 61000-6-4 (30-6000 MHz) EN 61000-6-4 (30-6500 MHz) |
| Conducted RF emission | CISPR 16-2-1 | Power port | EN 61000-6-4 |
| Ethernet ports | EN 61000-6-3 | ||
| Dielectric strength | EN 50155 | Power port to all other ports | 2250 VDC, 1 min |
| Ethernet ports to all other ports | 2250 VDC, 1 mina | ||
| Gbps Ethernet ports to all other ports | 2250 VDC, 1 mina |
a750 VDC after damp heat, according to EN 50155
| Environmental phenomena | Basic standard | Description | Test levels |
|---|---|---|---|
| Temperatures | EN 60068-2-1 EN 60068-2-2 | Operational | -40 to +70°C (-40 to +158°F)a.,b. |
| Storage and transport | -55 to +85°C (-67 to +185°F) | ||
| Humidity | EN 60068-2-30 | Operational | 5-95% relative humidity |
| Storage and transport | |||
| Altitude | Operational | 2000 m/80 kPa | |
| Service life | MIL-HDBK-217F2, GB, 25°C (+77°F) 2: IEC 62380 | Operational | 20 years according to IEC/TR 62380 |
| MTBF | Viper-3512(-E)-T12: 1: 557,000 h; Viper-3512(-E)-T3G-T9: 1: 549,000 h, 2: 561,000 h; Viper-3512(-E)-T5G-T7: 1: 544,000 h | ||
| Vibration | IEC 60068-2-6 (sine) | Operational | 2 g rms 5-500 Hz, 5 sweeps |
| IEC 60068-2-64 (random) | Non-operational long life simulation | 11.44 m/s² rms 5-150 Hz, 5 hours 2.3 m/s² rms 5-2000 Hz, 1.5 hours | |
| Shock | IEC 60068-2-27 | Operational | 10 g, 30 ms, half sine; 20 g, 11 ms, saw tooth; 100 g, 6 ms, half sine |
| Weight | EN 60529 | 1.4 kg | |
| Degree of protection | Enclosure | IP67 | |
| Cooling | EN/IEC/UL 61010-1 EN/IEC/UL 61010-1 | Convection | |
| Overvoltage category | EN 50124-1 | OVC II | |
| Pollution degree | EN/IEC/UL 61010-1 | PD3 macro environment and PD2 micro environment. | |
| Location | IEEE 1478 | Outdoor, wet locations Class 1, condition E4. Indoor |
aRefer to "Safety and Regulations" chapter regarding touch temperature
bOperational at +85°C for a limited time
Installation and maintenance shall be made under controlled environments.
6. Revision Notes
| Revision | Date | Change description |
|---|---|---|
| Rev. B | 2025-03 | 1.6 Integrity Seal; new chapter |
| Rev. A | 2024-10 | First version |
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