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SPU232

The Alstom SPU232 is a high-reliability Signal Processing Unit designed for railway signaling and train control systems. As part of Alstom’s advanced ERTMS/ETCS (European Rail Traffic Management System / European Train Control System) solutions, the SPU232 ensures safe and efficient rail operations by processing vital signaling data and interfacing with trackside and onboard systems.

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Key Features
✔ Ultra-Reliable Architecture

Dual-channel redundant processing (EN 50129 SIL4 certified)

Hardware-based fault detection (μs-level response)

✔ Advanced Signaling Functions

Real-time axle counter/track circuit processing

Movement Authority calculation (ERTMS/ETCS compliant)

Interface with RBCs, interlockings, and LEUs

✔ Cyber-Resilient Design

IEC 62443-3-3 compliant security

Secure boot with cryptographic authentication

✔ Deployment Flexibility

Modular design for trackside/onside mounting

-40°C to +70°C operational range (EN 50155)

Technical Specifications
Parameter Specification
Safety Standard EN 50126/8/9 SIL4
Input Voltage 24V DC ±20% (redundant supply)
Communication Ethernet (ERTMS), RS-422, CAN
MTBF >1 million hours
Weight 3.2 kg (ruggedized housing)
Applications
Trackside: Interlocking systems, axle counter processing

Onboard: ETCS onboard units (EUROBALISE interface)

Hybrid Rail: Legacy + ERTMS migration projects