Averaging 1.6 million passengers per day, the Taipei Metro, also known as the Taipei Mass Rapid Transit (MRT) system, is one of the busiest transportation systems in Asia and has become an important driver for business and lifestyle in Taiwan. To ensure smooth and reliable operations and keep a watchful eye on the security and safety of riders, a CCTV-based onboard video surveillance system has been in place on a number of Taipei Metro carriages since 2010. The system makes it possible for train drivers to access live video images of critical areas, and video recordings are also available for later review and analysis.

In late 2012, the Taipei Metro undertook a project to install an onboard video surveillance system for the Nangang-Banqiao-Tucheng Line. Instead of relying on the analog cameras and DVR systems that are used on the other lines, the Taipei Metro used Moxa IP video technology, including IP cameras and network video recorders (NVR).

The Brea, CA-based company’s IP video technology enables the Nangang-Banqiao-Tucheng Line to achieve greater video coverage, improved image quality, higher bandwidth, and better system management. By using an open network architecture, the system is also easier to deploy and integrate into the Taipei Metro’s other systems. Finally, IP video technology supports live view and video

A diagram of the video surveillance equipment implemented along the train
recording, both on the train itself and remotely at train stations and Operation and Control Centers (OCCs).

As an essential passenger safety and security system, it was critical for the video surveillance system to meet the Taipei Metro’s strict performance and reliability criteria for EMC, vibration, and physical protection. Moxa’s IEC 60571-compliant IP cameras, network switches, and network video recorders were found to meet or exceed the technology and performance requirements, and were then selected to power the system.

Three models of the Moxa IP rolling stock camera line are used in the onboard video surveillance system: the VPort 16-M12 series, a ceiling-mounted, dome-type IP camera for carriage surveillance; the VPort 26A series, a ceiling- mounted, low-illumination, dome-type IP camera for surveillance in the driver’s cab; and the VPort P06HC series, a hidden-type IP camera for the intercom system.

All three IP cameras conform to ONVIF standards, meet the rugged EMC, temperature, vibration, and shock design requirements of IEC 60571, and support Full-HD, 1080P (1920 × 1080) resolution for large images. Moxa also developed custom hardware and form factors in order to meet special requirements for the Taipei Metro system.

The V2416 and the V2616 Moxa rolling stock NVRs are being used for on-board recording. The V2416 smart NVR enables video recording, live display, and system management in the driver’s cab. The network video recorders, designed for reliable operation on moving vehicles, feature a patented anti-vibration kit with hard disk modules that have passed the IEC 61373 vibration test. The hard disk modules can be hot-swapped for easy maintenance and minimal system downtime.

Moxa’s rolling stock TN-5516-8PoE Ethernet switches are used for the IP-based communication backbone along the train. The TN models are specially designed to withstand extreme temperatures and vibration, and they feature locking M12 connectors to minimize the chance of disconnection. Since the IP cameras are powered over the switches’ PoE ports, the system benefits from greatly reduced cabling. The port-trunking function on the Moxa switches also makes it possible for the system to support wide bandwidth usage. Advanced switch management enables system operators to have full control over network performance, security, and configuration.

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