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www.westermo.com
WeOS
Viper TBN Series
Managed EN 50155 Backbone Routing Switch
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Table of Contents
1. General Information ........................................................................ 3
1.1. Legal Information ................................................................... 3
1.2. About This Guide ................................................................... 3
1.3. Software Tools ...................................................................... 3
1.4. License and Copyright for Included FLOSS ................................. 3
1.5. WeOS Management Guide ...................................................... 3
2. Safety and Regulations ................................................................... 4
2.1. Warning Levels ..................................................................... 4
2.2. Safety Information ................................................................. 5
2.3. Care Recommendations ......................................................... 6
2.4. Maintenance ......................................................................... 6
2.5. Product Disposal ................................................................... 6
2.6. Compliance Information .......................................................... 7
2.6.1. Agency Approvals and Standards Compliance .................... 7
2.6.2. FCC Part 15.105 .......................................................... 7
2.6.3. Simplified Declaration of Conformity .................................. 8
3. Product Description ........................................................................ 9
3.1. Product Description ................................................................ 9
3.2. Available Models ................................................................... 9
3.3. Hardware Overview ............................................................. 10
3.4. Connector Pinout ................................................................. 11
3.5. Bypass Functionality ............................................................ 12
3.6. LED Indicators .................................................................... 15
3.7. Dimensions ........................................................................ 16
4. Installation .................................................................................. 17
4.1. Wall Mounting ..................................................................... 17
4.2. Connection of Cables ........................................................... 17
4.3. Cooling .............................................................................. 17
4.4. Replacement of Product ........................................................ 17
4.5. EN 45545-2 Mounting Notes .................................................. 18
5. Specifications .............................................................................. 19
5.1. Interface Specifications ......................................................... 19
5.2. Type Tests and Environmental Conditions ................................. 21
6. Revision Notes ............................................................................ 23
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1. General Information
1.1. Legal Information
The contents of this document are provided “as is”. Except as required by applicable law,
no warranties of any kind are made in relation to the accuracy and reliability or contents of
this document, either expressed or implied, including but not limited to the implied
warranties of merchantability and fitness for a particular purpose. Westermo reserves the
right to revise this document or withdraw it at any time without prior notice.
Under no circumstances shall Westermo be responsible for any loss of data or income or
any special, incidental, and consequential or indirect damages howsoever caused.
More information about Westermo can be found at www.westermo.com.
1.2. About This Guide
This guide is intended for installation engineers and users of the Westermo products.
It includes information on safety and regulations, a product description, installation
instructions and technical specifications.
1.3. Software Tools
Related software tools are available at www.westermo.com/support/software-tools.
1.4. License and Copyright for Included FLOSS
This product includes software developed by third parties, including Free/Libre Open
Source Software (FLOSS). The specific license terms and copyright associated with the
software are included in each software package respectively. Please visit the product web
page for more information.
Upon request, the applicable source code will be provided. A nominal fee may be charged
to cover shipping and media. Please direct any source code request to your normal sales or
support channel.
1.5. WeOS Management Guide
This product runs WeOS (Westermo Operating System). Instructions for quick start,
configuration, factory reset and use of USB port are found in the WeOS Management
Guide at www.westermo.com.
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2. Safety and Regulations
2.1. Warning Levels
Warning signs are provided to prevent personal injuries and/or damages to the product.
The following levels are used:
Level of warning
WARNING
CAUTION
NOTICE
Description Consequence
Indicates a potentially
hazardous situation
Indicates a potentially
hazardous situation
Provides information in order
to avoid misuse of the
product, confusion or
misunderstanding
Used for highlighting general,
but important information
personal injury
Possible death or major
injury
Minor or moderate
injury
No personal injury Minor damage to the
No personal injury Minor damage to the
Consequence
material damage
Major damage to the
product
Moderate damage to the
product
product
product
NOTE
Table 1. Warning levels
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2.2. Safety Information
Before installation:
Read this manual completely and gather all information available on the product. Make sure
it is fully understood. Check that your application does not exceed the safe operating
specifications for the product.
This product should only be installed by qualified personnel.
This product should be built-in to an apparatus cabinet or similar, where access is
restricted to service personnel only.
The power supply wiring must be sufficiently fused, and if necessary, it must be possible to
disconnect it manually from all power supply. Ensure compliance to national installation
regulations.
WARNING - PREVENT ACCESS TO HAZARDOUS VOLTAGE
Before mounting, using or removing this product: Prevent access to
hazardous voltage by disconnecting the product from all power supply.
WARNING - HAZARDOUS VOLTAGE
Do not open the connected product. Hazardous voltage may occur within
this product when connected to power supply.
CAUTION - HOT SURFACE
Be aware of that the surface of this product may become hot. When this
product is operated at high temperatures, the external surface of the
product may exceed Touch Temperature Limit according to EN/IEC/UL
60950-1.
NOTICE - PROTECTIVE EARTHING CONDUCTOR
Before powering-up, a protective earthing conductor must be connected
to the protective earth terminal with at least AWG15.
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NOTICE - REDUCE RISK OF FIRE
To reduce the risk of fire:
1. Use only No. 21 AWG or larger power cable
2. Use only No. 26 AWG or larger telecommunication line cord
NOTICE - CONNECT EXTERNAL FUSE
The product has no internal fuse and should be connected via an external
fuse for protection.
NOTICE - 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
Follow the care recommendations below to maintain full operation of the product and to
fulfill the warranty obligations:
• Do not drop, knock or shake the product. Rough handling above the specification may
cause damage to internal circuit boards.
• Do not use harsh chemicals, cleaning solvents or strong detergents to clean the product.
• Do not paint the product. Paint can clog the product and prevent proper operation.
If the product is not working properly, contact the place of purchase, nearest Westermo
distributor office or Westermo Tech support.
2.4. Maintenance
No maintenance is required, as long as the product is used as intended within the specified
conditions.
2.5. Product Disposal
This symbol means that the product shall not be treated as unsorted municipal waste when
disposing of it. It needs to be handed over to an applicable collection point for recycling
electrical and electronic equipment.
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By ensuring the product is disposed of correctly, you will help to reduce hazardous
substances and prevent potential negative consequences to both environment and human
health, which could be caused by inappropriate disposal.
Figure 1. WEEE symbol for treatment of product disposal
2.6. Compliance Information
2.6.1. Agency Approvals and Standards Compliance
Type
Climate • EN 50155/IEC 60571 class OT4, Railway applications - Electronic equipment used
EMC • EN 61000-6-2, Immunity industrial environments
Mechanical
(Shock and
vibration)
Insulation
(Coordination and
test)
Fire protection • EN 45545-2, Fire protection on railway vehicles
Approval/Compliance
on rolling stock, Rapid temperature variations class H2
• IEEE 1478 class 1, condition E4 (incl Salt Mist), Environmental conditions for transit
rail car electronic equipment
• EN 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). Compliant with SBB requirements.
• Tested and verified for Class S1, ÖBB Radio compatability in near field in
accordance with ÖBB Infrastructure Edition 4, Revision 14 (Shunting Radio).
• Tested and verified for FCC part 15b class A (CFR 47)
• EN 61373 category 1, class A and B
• IEEE 1478 class 1, condition E4, inclucluding shock tests 10 g/30 ms and 20 g/11 ms
in all directions
• EN 50124-1, Railway applications – Insulation coordination
• EN 50155/IEC 60571, Railway applications - Electronic equipment used on rolling
stock
• NFPA 130, Fire protection for fixed guideway transit and passenger rail system
Table 2. Agency approvals and standards compliance
2.6.2. FCC Part 15.105
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.
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This product generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the user manual, may cause harmful interference to radio
communications. Operation of this product in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at the users
own expense.
2.6.3. Simplified Declaration of Conformity
Hereby, Westermo declares that this product is in compliance with applicable EU
directives. The full EU declaration of conformity and other detailed information is available
at www.westermo.com/support/product-support.
Figure 2. The European conformity marking
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3. Product Description
3.1. Product Description
The Viper TBN is a managed backbone routing switch optimised for the needs of the
railway rolling stock market. The dual bypass relay ensures that aggregated links between
cars are maintained, even if there is a power failure in one car. Gbps ports cope with high
bandwidth backbone, consist ring and end-devices.
The Viper is designed to withstand the tough environment on-board trains, exposing the
switch to constant vibration, extreme temperatures, humidity and a demanding electrical
environment.
A GORE-TEX® membrane prevents internal condensation. Threading integrated in chassis
provides for additional vibration resistance. High-level isolation between all interfaces
enables direct connectivity to vehicle auxiliary power and protects against overvoltage and
flashover. IP67 protection prevents ingress of water and dust. An overall optimised design
results in an extremely compact package in combination with very high MTBF for easy
integration and low lifecycle cost.
Thorough type testing at independent ISO/IEC 17025 and ILAC MRA certified labs,
accredited to a wide range of standards, show that the Viper series fulfills EN 50155 and
other requirements. The state-of-the-art Westermo production facility ensures the quality
of each individual unit, e.g. through temperature cycling burn-in testing.
The WeOS operating system offers an extensive suite of IP networking features for
resilient and flexible networks, e.g. the FRNT ring protocol with very fast failover. The
powerful layer 3 routing capability ensures communication between the backbone and
consist networks and offers full support for IEC 61375, including TTDP network
inauguration and TRDP realtime data protocol (pending). The backup device accessory
matches the Viper in robustness and offers easy configuration update and backup.
3.2. Available Models
Art. no.
3635-2020 Viper-208-T4G-TBN L3 4
3635-2120 Viper-208-T8G-TBN L3 8
Table 3. Available Viper TBN models
Model Software Gbps ports
NOTICE - MECHANICAL FORCE ON VENTILATION
MEMBRANE
Do not cover or bring mechanical force to the ventilation membrane on
the back of the product.
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3.3. Hardware Overview
DC
CON
FRNT
RSTP
ON
USB
X1
X5
X7
Bypass 1
Bypass 2
X8
X2
X3
X4
X6
24-110 V
0.6±0,1 Nm / 0,45±0,1 lbft
M12 To rque
DC
L1
L2
1 2
45
6
8
7
3
Figure 3. Location of interface ports and LED indicators
No.
Description No. Description
1 LED indicator 2 Gbps port
3 GORE-TEX ventilation membrane on
the rear side
5 Power connection 6 Console port
7 Protective earth connection 8 USB port
4 100 Mbps port (T4G models only,
Gbps port on T8G models)
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3.4. Connector Pinout
2 1
3 4
Pin
no.
1 +DC1
2 +DC2
3 -COM
4 -COM
Viper supports redundant power connection. The
positive inputs are +DC1 and +DC2. The negative
input for both supplies is -COM
Signal
Illustration
Table 4. Power connector
Pin no.
1 NC
2 TX
3 RX
4 NC
5 GND
a
No Connect. Do not connect.
Signal Illustration
a
a
Table 5. Console connector
Pin no.
1 DN
2 VBUS
3 NC
4 DC
5 GND
a
No Connect. Do not connect.
Signal Illustration
a
Table 6. USB connector
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Pin
1
2
3
45
6
7
8
no.
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.
Signal
Illustration
Table 7. 100 Mbps Ethernet connector
Pin no.
1 DA+
2 DA-
3 DB+
4 DB-
5 DD+
6 DD-
7 DC-
8 DC+
Signal Illustration
Table 8. Gbps connector
3.5. Bypass Functionality
The bypass functionality secures connection backbone traffic in case of power failure by
bridging the two pairs of ports normally connected to the backbone.
The ports are cross-coupled when in bypass. This is since the main use cases require the
use of fixed MDI/MDIX settings. During power loss and connection of the two adjacent
switches, the intent is to compensate for the fixed MDI/MDIX settings.
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Viper-208-T4G-TBN internal bypass
X5.1 connected to X7.3
X5.2 X7.4
X5.3 X7.1
X5.4 X7.2
X6.1 X8.3
X6.2 X8.4
X6.3 X8.1
X6.4 X8.2
Table 9. Bypass interfaces
Viper-208-T8G-TBN internal bypass
X5.1 connected to X7.3
X5.2 X7.4
X5.3 X7.1
X5.4 X7.2
X5.5 X7.8
X5.6 X7.7
X5.7 X7.6
X5.8 X7.5
X6.1 X8.3
X6.2 X8.4
X6.3 X8.1
X6.4 X8.2
X6.5 X8.8
X6.6 X8.7
X6.7 X8.6
X6.8 X8.5
Table 10. Bypass interfaces
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NOTE
Switch 1 Switch 2 Switch 3
X7 X5
X7
X5
X8 X6 X8 X6
In bypass mode, ports X5/X7 and X6/X8 are connected to conduct
internal cross-over. The purpose is to facilitate use cases when these
ports are configured with fixed MDI (or fixed MDIX). To support such use
cases, the network design should ensure that cabling also conduct a crossover between these ports on adjacent Viper-TBNs. Then there would be
an odd number of cross-overs between adjacent Viper-TBNs, even during
power-loss of an intermediate Viper-TBN.
When bypassing a switch, approximately 5 m (16 ft) of the transmission
range (100 m, 300 ft) is consumed.
As an example, if a network is intended to cope with a single car blackout
scenario and that two Vipers in that case will be by-passed, the total cable
distance through the blackout car to adjacent switches on each side of the
blackout car, should not exceed 90 m (300 ft).
Normally, the Viper can handle longer distances, up to 150 m (500 ft), but
this can not be guaranteed and has to be investigated case by case. Cable
length data is valid for CAT5e cable.
Figure 4. Bypassing of Viper
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3.6. 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
BLINK Location indicator ("Here I am!"). Activated
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
BLINK Product configured as FRNT focal point
DC OFF Product has no power
GREEN Power OK on DC1 and DC2
RED Power failure on DC1 or DC2
X1 to X8 OFF No link
GREEN Link established
GREEN
FLASH
YELLOW Port alarm, or port is set in blocking state by
L1 to L2 OFF Relays in bypass mode
GREEN Relays connected to unit (no bypass)
Table 11. LED indicators
up. (Alarm conditions are configurable, see
WeOS Management Guide)
when connected to WeConfig tool, or upon
request from web or/and CLI. RED BLINK
during boot indicates pending cable factory
reset.
Data traffic indication
link redundancy protocol
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3.7. Dimensions
164 ±0,5
56 ±0,3
100
7,2
+-0,2
0,5
82 ±5
29 ±5
72
37
7,4 ±0,5
175
31 ±5
Grounding point
Screw M5x10
Dimensions are stated in mm and applies to both models.
Figure 5. Dimensional drawing
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4. Installation
4.1. Wall Mounting
The product can be wall mounted vertically or horizontally. There are four pieces of 7 mm
bores for this. Use four M5, M6 or 1/4" screws with 12 mm washers on a flat and stable
surface.
4.2. Connection of Cables
Recommended tightening torque for the M12 connectors is 0.6 Nm.
When connecting the power cable, ensure that the pins are connected correctly before
tightening the power cable to the unit.
NOTICE - UNUSED CONNECTORS
Unused connectors must be covered by a protective cap (delivered with
the product), tightened to the specified torque in order to fulfill the
specified ingress protection code.
NOTICE - CONNECT EXTERNAL FUSE
The product has no internal fuse and should be connected via an external
fuse for protection.
4.3. Cooling
This productrelies on convection cooling. Make sure that it is installed so that the ambient
temperature is within the specified temperature range, e.g. by avoiding obstruction of the
airflow around the product.
4.4. Replacement of Product
Disconnect all cables and unscrew the product from the wall. Mount the replacement
product and reconnect all cables, observing the instructions in Connection of Cables [17].
For easy replication of the configuration of the original product, 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), i.e. time for replacement of product is: < 8 minutes.
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CAUTION - HOT SURFACE
Be aware of that the surface of this product may become hot. When this
product is operated at high temperatures, the external surface of the
product may exceed Touch Temperature Limit according to EN/IEC/UL
60950-1.
4.5. EN 45545-2 Mounting Notes
Two product can be mounted together and as a single interior non-listed group in the
sense of EN 45545-2 definitions. For multiple product, the spacing requirements for
interior non-listed groups must be met.
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5. Specifications
5.1. Interface Specifications
DC, Power port
Rated voltage 24 to 110 VDC
Operating voltage 16.8 to 143 VDC (14.4 to 154 VDC for 100 ms)
Rated current Max 0.7 A at 24 VDC, max 0.16 A at 110 VDC
Rated frequency DC
Inrush current, I²t 80 mA²s at 24 VDC, 140 mA²s at 110 VDC
Startup current
Polarity Reverse polarity protected
Redundant power input Yes
Isolation ≥20 MΩ at 500 VDC
Connector 4-pin, male, M12, A-coded, recommended Westermo cables:
Cable size M12, recommended cable area 0.5 mm² (minimum 0.25 mm²)
a
Recommended external supply current capability for proper startup
a
Max 680 mA at 16.8 VDC (Viper-208-T4G-TBN)
Max 780 mA at 16.8 VDC (Viper-208-T8G-TBN)
3146-1106 for 1.5 m
3146-1107 for 5 m
Cable dimensions depend on choice of M12 connector
100 Mbps ports
a
Electrical specification IEEE std 802.3
Data rate 10 Mbps, 100 Mbps, manual or auto
Duplex Full or half, manual or auto
Transmission range Up to 150 m with CAT5e cable or better
Isolation ≥20 MΩ at 500 VDC
Connector 4-pin, female, M12, D-coded, auto MDI/MDI-X, recommended Westermo
cables:
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 cable Required
Conductive chassis Yes
FRNT reconfiguration time Typically below 20 ms
a
100 Mbps ports are X5-X8 on Viper-208-T4G-TBN
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Gbps ports
a
Electrical specification IEEE std 802.3
Data rate 10 Mbps, 100 Mbps, 1 Gbps, manual or auto
Duplex Full or half, manual or auto
b
Transmission range Up to 150 m with CAT5e cable or better
Isolation ≥20 MΩ at 500 VDC
c
Connector 8-pin, female, M12, X-coded
Shielded cable Required
Conductive chassis Yes
FRNT reconfiguration time Typically below 20 ms
a
Gbps ports are: X1-X4 on Viper-208-T4G-TBN, X1-X8 on Viper-208-T8G-TBN
b
For 1 Gbps, auto negotiation is always enabled
c
In case of bypass, no isolation between X5 to X7 and X6 to X8
USB port
Electrical specification USB 2.0 host interface
Data rate Up to 480 Mbps (high-speed mode)
Maximum supply current 500 mA
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
Isolation ≥20 MΩ at 500 VDC
No isolation to USB or chassis
Connector 5-pin, female, M12, B-coded, recommended Westermo cables:
1211-2215 (serial port) or 1211-4073 (USB)
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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 por t
Surge EN 61000-4-5 Power port L-E: ± 2 kV, 42 Ω, 0.5 µF, 1.2/50 µs
L-E: ± 0.5 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
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 por t
Radiated RF emission CISPR 16-2-3 Enclosure EN 61000-6-4 (30-6000 MHz)
ANSI C63,4
Class A
(FCC Part 15b)
Conducted RF
emission
Dielectric strength EN 50155 Power port to all
CISPR 16-2-1 Power port EN 61000-6-4
CISPR 32 Ethernet ports EN 61000-6-3
2250 VDC, 1 min
other ports
Ethernet ports to
2250 VDC, 1 min
a
all other ports
Gbps Ethernet
2250 VDC, 1 min
a
ports to all other
ports
a
750 VDC after damp heat, according to EN 50155
Table 12. EMC and electrical conditions
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Environmental
phenomena
Basic
standard
Temperatures EN 60068-2-1
EN 60068-2-2
Description
Test levels
Operating -40 to +70°C (-40 to +158°F)
Storage and
-55 to +85°C (-67 to +185°F)
ab
transport
Humidity EN 60068-2-30 Operating 5-95% relative humidity
Storage and
transport
Altitude Operating 2000 m/70 kPa
Service life Operating 20 years according to IEC/TR 62380
MTBF 1: MIL-
HDBK-217FN2, GB,
+25°C/ +77°F
2: IEC 62380
Viper-208-T4G-TBN:
1: 460,000 hours
2: 598,000 hours
Viper-208-T8G-TBN:
1: 360,000 hours
2: 564,000 hours
Vibration IEC 60068-2-6
(sine)
Operational 5 sweeps cycles:
7.5 mm 5-8 Hz
2g, 8-500 Hz
IEC
60068-2-64
(random)
Shock IEC
60068-2-27
Non-operational
long life
11.44 m/s² rms 5-150 Hz, 5 hours
20 m/s² rms 5-150 Hz, 30 min operational
simulation
Operational 10 g, 30 ms, half sine
20 g, 11 ms, saw tooth
Enclosure EN 60950-1 Zinc Fire enclosure
Weight 1.5 kg
Degree of protection IEC 60529 Enclosure IP66 and IP67
c
Cooling Convection
a
Refer to "Safety and Regulations" chapter regarding touch temperature
b
Operational at +85°C for a limited time
c
Provided all connectors are connected with IP66 and IP67 cablings or fitted with protective caps (delivered with
the unit) and tightened to the specified torque.
Table 13. Environmental and mechanical conditions
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6. Revision Notes
Revision
Rev. B 2019-06 3.1 Product Description updated, 4.4 Replacement of Product updated
Rev. A 2018-03 First version
Date Change description
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Westermo • SE-635 35 Stora Sundby, Sweden
Tel +46 16 42 80 00 Fax +46 16 42 80 01
E-mail: info@westermo.com
www.westermo.com
6635-2200 REV. B 2019 06 Westermo Network Technologies AB, Sweden
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