INDUSTRY

Smart city (surveillance)
 

BACKGROUND

An IP-based CCTV surveillance system was implemented along a 50-km railway line with 11 tunnels and 16 bridges. The solution enables comprehensive monitoring of stations, passenger areas, and critical rail infrastructure including bridges, tunnel entrances, and yards, delivering real-time video to local control rooms and centralized monitoring centers through a fiber-based network.
 

CHALLENGES

Deploying CCTV industrial PoE switches in this line was challenging because of:

• Tunnel-heavy terrain + extreme weather
• High power & redundancy needs
• Difficult maintenance conditions
• Mandatory compliance with standards and integration with existing system

 

SOLUTION PROVIDED

The rugged, wide-temperature EHG7508-4PoE-4SFP switches were selected for deployment along the corridor, offering the following key advantages:

• Industrial-ready design – DIN-rail mountable with high EMC resistance, engineered for reliable deployment in industrial infrastructure.
• Wide operating temperature range (–40 °C to +75 °C) – Ensures stable performance in the cold and humid tunnel conditions of this region.
• Fanless rugged metal housing – IP30 rated, dust-resistant and with no moving parts, reducing maintenance needs in restricted and hard-to-access tunnel environments.

The switches were deployed in a ring topology, with each ring configured with a dedicated management VLAN for network control and separate VLANs for CCTV and SOS/PA services. This segmentation ensured efficient traffic handling while maintaining clear service prioritization across the network.
 

RESULTS

Despite the extreme weather conditions, system stability was successfully improved through on-site troubleshooting and optimized grounding and configuration practices. As a result, the network infrastructure now operates with stable and reliable performance.