The Enterasys A2H254-16-RH is a ruggedized managed Layer 2+ industrial Ethernet switch designed for mission-critical infrastructure in extreme environments. As part of the A2H 250 series, this 16-port switch combines 12x 10/100/1000BASE-T ports with 4x 100BASE-FX multi-mode fiber interfaces, specifically engineered for railway signaling systems requiring EN 50155 compliance. The A2H254-16-RH’s “RH” designation confirms its certification for rolling stock applications, capable of withstanding 5g vibration (IEC 61373 Category 1 Class B) and 50g shock impacts.
Featuring Enterasys’ Adaptive Network Segmentation technology, the Enterasys A2H254-16-RH achieves <2μs port-to-port latency for real-time train control systems. Its dual hot-swappable power supplies support 24-110VDC input with automatic load balancing, ensuring 99.999% availability in metro tunnel communication networks. The switch’s IP67-rated aluminum housing and conformal coated PCB withstand high humidity (up to 95% non-condensing) in coastal wind farm installations.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | A2H254-16-RH |
| Manufacturer | Enterasys Networks |
| Product Type | Managed Industrial Ethernet Switch |
| Copper Ports | 12x 10/100/1000BASE-T (M12 X-coded) |
| Fiber Ports | 4x 100BASE-FX (ST connectors, 2km reach) |
| Switching Capacity | 32 Gbps |
| Forwarding Rate | 23.8 Mpps |
| Power Input | 24-110VDC (dual redundant) |
| Protection | IP67, 10kV surge protection |
| Operating Temp | -40°C to +75°C |
| Certifications | EN 50155, EN 50121-4, DNV GL |
| Dimensions | 280x90x220mm (DIN rail/rack mount) |
| Weight | 3.8kg |
Key Features and Advantages:
Network resilience: The A2H254-16-RH implements Hitless Switching technology, maintaining <20ms failover during power transitions in electric multiple unit (EMU) networks. Its built-in MPLS support enables seamless integration with legacy railway signaling protocols like ETCS Level 2.
Environmental hardening: Each M12 connector withstands 100N axial pull force (EN 61076-2-109) in mining vehicle deployments. The switch’s thermal design operates at full load without derating up to 75°C, critical for desert solar farm installations.
Cybersecurity: Secure Boot with hardware-based TPM 2.0 ensures firmware integrity for smart grid SCADA systems. Role-based access control (RBAC) meets NERC CIP requirements through integrated 802.1X authentication.
Application Areas:
The Enterasys A2H254-16-RH excels in:
- Rail Transport: EN 50155-certified onboard train networks
- Renewable Energy: DNV GL-compliant offshore wind turbine arrays
- Mining: ATEX Zone 2 approved conveyor control systems
- Utilities: IEC 61850-3 compliant substation automation
In metro systems, the switch’s 4kV electrical fast transient (EFT) immunity protects against pantograph arcing interference. Oil pipelines leverage its MODBUS TCP/IP gateway functionality to integrate legacy RTUs. The fiber ports enable 2km connectivity between control rooms and remote IO stations in LNG terminals.
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Installation and Maintenance:
Installation preparation: Verify rail vehicle grounding continuity (<0.1Ω) before deploying A2H254-16-RH in EMU applications. Use Enterasys-certified BC-M12-5E-SHDB cables for Category 5e Shielded connections in high-vibration environments.
Maintenance recommendations: Perform bi-annual dielectric testing on DC power inputs using Megger MIT515 insulation tester. Rotate redundant power modules quarterly to ensure capacitor longevity in 24/7 substation operations. Utilize the built-in BER tester for proactive fiber link monitoring in tunnel installations.
Product Assurance:
Enterasys provides 12-month extended warranty for A2H254-16-RH, including free firmware updates for cybersecurity patches. Each unit undergoes 800-hour thermal cycling (-40°C↔+85°C) and 30g vibration testing (MIL-STD-810G). Our 24/7 technical support guarantees 4-hour response for critical infrastructure failures with optional on-site configuration hardening services for IEC 62443 compliance.
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