Published: 2025-07-18
Nanjing Metro Line 7 – a vital artery connecting the city's north–south axis – has brought the Jiangbei New Area and the main urban core into closer synergy, significantly elevating Nanjing’s standing within the Yangtze River Delta transportation network. The “intelligent nervous system” ensuring this urban artery operates safely, punctually, and uninterruptedly is none other than Shanghai Bo Ying Communication Technology Co., Ltd. – a national‑team player and leading enterprise in the industrial communication sector.
I. A Critical Link Connecting Urban Development
The initial operation section of the central segment of Line 7 spans 10.99 km, comprising 8 stations (including 4 interchange stations), all laid underground.
As a key project strengthening Nanjing’s status as a transportation hub, Line 7 effectively drives the efficient interconnection between the Nanjing Metropolitan Area and the Yangtze River Delta urban agglomeration. More importantly, it covers numerous densely populated areas, significantly relieving surface traffic congestion and providing citizens with a more reliable and efficient travel option, thereby markedly enhancing urban quality of life.
Such a major livelihood and strategic project imposes exceptionally stringent requirements on its underlying industrial communication network: absolute stability and reliability 365 days a year, 24 hours a day; millisecond‑level response times with zero tolerance for errors; and the ability to operate stably over extended periods in complex underground environments characterised by humidity, vibration, and strong electromagnetic interference.
II. National‑Team Strength Forges a “Communication Iron Corps”
Faced with the daunting challenges of Nanjing Metro Line 7, MRD – leveraging its deep technical expertise and profound understanding of critical infrastructure – delivered an outstanding industrial switch solution:
High‑Speed Connectivity Without Compromise
MRD switches provide wire‑speed non‑blocking forwarding and ultra‑low latency, ensuring control commands reach their destinations instantaneously and information flows smoothly, supporting efficient dispatching and an enhanced passenger experience.
Ultimate Stability Defying Harsh Environments
Tailored for the metro’s uniquely demanding operating conditions, MRD industrial‑grade switches are designed with military‑grade reliability to ensure that train control signals and critical monitoring data are transmitted continuously and stably despite humidity, vibration, and strong electromagnetic interference, laying a solid foundation for safe operation.
Defence‑in‑Depth Security Architecture
Network security is the cornerstone of safe rail transit operations. MRD devices incorporate multiple intelligent security protection mechanisms, effectively defending against various cyber threats and building a trustworthy security barrier for the information flows along this urban artery.
An Exemplary Model of Domestic Substitution
Against the backdrop of achieving independent control over core technologies, MRD stands as a pillar of domestic substitution. Its products are 100% independently developed, providing Nanjing Metro Line 7 with a communication foundation that delivers performance on par with international advanced levels while ensuring a secure and autonomous supply chain. This is not only a testament to technical prowess but also a solid support for the national strategy of securing critical information infrastructure.
– MRD Meridian Solution –
·The Automatic Fare Collection (AFC) system in rail transit requires network devices with fanless design, high protection ratings, reliability, and redundant power mechanisms to ensure ticketing operations run smoothly.
·Each access network must support redundancy switchover within 50 ms.
·On‑site access ring networks are built with industrial‑grade switches featuring high MTBF and long lifetime.
·The AFC system connects to the transmission node network via aggregation nodes at each station.
– MRD Switches –
TNM4000
·Fanless, IP40 protection rating, high‑reliability uninterrupted operation
·Up to 8 10‑Gigabit ports and 64 Gigabit ports to handle high‑density access
·7 hot‑swappable service slots for on‑demand configuration and flexible expansion
TCC4100
·M12 rugged connectors for high‑security industrial switching
·Fanless, high protection rating, high‑reliability uninterrupted operation
·Highly redundant ring network design
·Configurable with up to 12 Gigabit M12 ports to meet service access requirements
Looking ahead, MRD will continue to be driven by innovation, deeply cultivating the smart rail transit sector and continuously refining its products and solutions. We are committed to contributing core technological strength to build safer, more efficient, and greener urban transportation networks, fulfilling our responsibility and mission as a national‑team enterprise.
Hotline: 86-21-58330762
Zip: 201203
Email: sales@mrdcom.net
Address: No.123 Curie Road, China (Shanghai) Pilot Free Trade Zone
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