This document discusses Westermo's trackside rail network equipment and topology considerations. It introduces Westermo and its product families, including the RedFox, Lynx, Wolverine, and Ibex, which meet standards like EN50121-4 and AREMA. Topologies covered include FRNT (fault-tolerant rings), micro-segmentation (zoning networks), and horseshoe designs. Cybersecurity features for rail networks are also highlighted.

1. Trackside Rail Networks
Resilient Devices and Topology Considerations
10/29/2020
Dakota Diehl, Technical Director North America
Benjamin Campbell, Technical Support Engineer

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Overview
▪ Introduction
▪ Trackside Rail Networks
▪ AREMA and EN50121-4
▪ Trackside Specific Hardware
▪ RedFox and Lynx Families
▪ Wolverine Family
▪ Ibex Family
▪ High Availability Networks
▪ Trackside Topologies
▪ FRNT
▪ Micro-segmentation
▪ Layer Three Redundancy

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▪ Founded in 1975
▪ Order intake: >55 Million USD Order Intake
▪ Number of employees: 350
▪ ~14% R&D spend
▪ Industry leading software and hardware
development force
▪ Production in Sweden, Switzerland and
Ireland with state-of-the-art process control
▪ Sales and support units in 12 countries,
distribution partners in many others
Who is Westermo?

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▪ Local Support Office
▪ Office in Elgin, Illinois (Chicago area)
▪ Staff in multiple time zones
▪ Full Sales and Logistical Staff
▪ Local Technical Staff
▪ Support for North America
Westermo US Office
Westermo sales unit Westermo partner

5. Trackside Rail Networks

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Trackside Applications
System integrator, local sub-supplier or End User
▪ Work with suppliers of signaling and train control systems
▪ Work with Project Integrators
▪ Work directly with Transit Authorities and Freight Rail Carriers
Example Applications
▪ Signaling
▪ House to House
▪ Train to Ground
▪ CCTV and Infrastructure Monitoring
▪ ROC to Station Communications
▪ Information Signs
▪ PA Systems

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EN50121-4 and AREMA
▪ EN 50121-4 Emission and immunity of the signaling and
telecommunications apparatus
▪ AREMA has similar standards for Trackside Equipment
▪ High standards for Emissions and Immunity for
Electromagnetic Interference
▪ Westermo RedFox, Lynx, Ibex and Wolverine families

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▪ Various voltage range options for varying
applications
▪ Polarity protection
▪ Redundant supply
▪ Triple isolation
Power Requirements

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▪ IP 40 or better
▪ No fans or moving parts
▪ Very High MBTF
▪ 517,000 Hours by MIL-HBDK-217K
Environmental

11. Westermo WeOS

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WeOS
▪ Westermo’s proprietary Network Operating System
▪ Developed in house in Sweden for Industrial Networking
▪ Linux Based
▪ Cyber Security Features
▪ A Tale of Two Generations
▪ WeOS Generation 4
▪ Proven reliability and power
▪ Very mature code base
▪ Massive feature base
▪ WeOS Generation 5
▪ Built from the ground up for an ever-evolving technology landscape
▪ Still in early phases of life
▪ New features monthly

13. Trackside Equipment

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Westermo RedFox Family
▪ Highest “horsepower” in the Westermo line
▪ Compact with high port density
▪ Westermo WeOS Operating System
▪ Generation 4 and 5
▪ Many different flavors depending on port requirements
▪ Fast Ethernet, Gig Ethernet and SFP
▪ DIN and 19” Rack Versions
▪ Wide Range of Power Options
▪ AC and DC
▪ IEC 61850-3 Substation Automation
▪ KEMA Approved

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Westermo Lynx Family
▪ Compact Switches and Routers
▪ Wide Range of Power Options
▪ Low Power Consumption
▪ Very little heat generation
▪ WeOS Generation 4 and 5
▪ Large Selection of Port Combinations
▪ Fast Ethernet, Gig Ethernet, SFP, Serial
▪ Legacy Serial Device Connection
▪ Serial to IP Conversion
▪ MicroLok II Gateway Support
▪ RS-232 and 422/485

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Westermo Wolverine Family
▪ SHDSL
▪ New data over old wires
▪ Layer 2 and 3 options
▪ Wide Range of Power Options
▪ Two “ranges”
▪ Based on Lynx and RedFox Family
▪ WeOS Generation 4
▪ Legacy Serial Device Connection
▪ Serial to IP Conversion
▪ MicroLok II Gateway Support
▪ RS-232 and 422/485

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Westermo Ibex Family
▪ Swiss Made
▪ Westermo Neratec
▪ Full suite of Rail wireless solutions
▪ Train to Train
▪ Train to Ground
▪ Passenger WIFI
▪ Cellular Access
▪ EN50155
▪ Westermo Wireless OS

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Train to Ground
• Wireless transmission while the train is on the move
• Wireless transmission when the train stops at the Stations and Depot
• CBTC and PTC applications

19. Trackside Network
Topology

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FRNT
• Built in functions to avoid uncontrolled Layer 2 loops.
• Link integrity control.
• Non-FRNT ports are not allowed to communicate with FRNT ports.
• Default FRNT alarm signaling via SNMP, LED, Digital-Out and Syslog.
• Very fast fail-over of Multicast traffic, no need to wait for IGMP timeouts.
• Supports different medias fiber optic, copper and SHDSL,
although fiber optic links allows for best fail-over performance.
FRNT

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Micro-segmentation
Backhaul
L3 routing and FW at each
node creates a Zone
Dynamic routing protocol (OSPF) used to advertise
location of subnets
L2 in the core network running fast recovery protocols

22. Horseshoe Topology Example

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▪ “Made Easy” Configuration
▪ High level suite of security features
▪ Dedicated Vulnerability Management
▪ Dedicated Cyber Security Team
▪ Network Segmentation
▪ Layer Three
▪ Firewall
▪ Access and Authentication Control
▪ User Authentication
▪ Port Access Control
▪ VPN Encryption
Cyber Security

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