Railway fiber optic networks face unique challenges: electromagnetic interference from 25kV AC traction power, continuous vibration from passing trains, and strict safety requirements for trackside installation. This guide covers the design considerations for railway ADSS deployments.
Railway-Specific Requirements
- EMC with traction power: The 25kV overhead catenary generates strong electromagnetic fields. ADSS cable must be positioned outside the critical interference zone — typically >2m from the catenary.
- Vibration tolerance: Passing trains generate ground vibration that transfers to poles and towers. Specify vibration dampers on all spans, regardless of length.
- GSM-R fiber requirements: Each GSM-R base station (every 3-5 km) requires 2-4 fibers. A 24-core ADSS cable supports 6-12 base stations.
Related Reading: Voltage class guide · Hardware selection · Extreme weather
Key Takeaways
- Position cable >2m from traction catenary for EMC compliance.
- Vibration dampers on all spans — train-induced vibration is continuous.
- 24-core ADSS supports 6-12 GSM-R base stations.
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