First Encounter with SR520: A Technological Love at First Sight

I still vividly remember the first time I saw the SR520 4G router, as if it were yesterday. As a technical engineer at Yeaplink, I’ve always been curious about new products. When the SR520 was placed before me, I was immediately drawn to its compact yet powerful design. Measuring 100x100x23mm with an all-metal body, it exuded a sense of durability. Holding it in my hand, I felt an inexplicable sense of reassurance.
As I delved into its specifications, my excitement grew. Dual SIM card design, dual network backup, multiple VPN support, industrial-grade design… Wasn’t this the ideal partner for intelligent transportation systems? I couldn’t wait to apply it to a real project.
A New Chapter in Smart Transportation: SR520’s Debut
The opportunity came soon enough. We received a project for an intelligent traffic management system, requiring the deployment of numerous traffic lights, cameras, and vehicle detectors in a medium-sized city. This project demanded extremely high communication stability and reliability, as even the slightest glitch could cause traffic chaos.
I immediately thought of the SR520. Its dual SIM card and dual network backup functions seemed tailor-made for this scenario. I recommended the SR520 to the project team and volunteered to take on the system deployment task.
Overcoming Challenges: SR520’s Field Deployment
With great enthusiasm, I began the field deployment of SR520. First came the connection of traffic lights. SR520’s two LAN ports perfectly met our needs, one for connecting the signal light controller and the other reserved for cameras. Next was the installation of SIM cards. I chose cards from two different operators to ensure network redundancy backup.
As I installed the SR520 in the roadside control box, I couldn’t help but admire its robust design. The operating temperature range of -35°C to 75°C meant it could work consistently from harsh winters to scorching summers. The IP30 protection rating also gave me confidence in its outdoor performance.

SR520: Dual SIM 4G Router

Symphony of Data: SR520’s Network Magic

As more devices were connected, SR520 began to showcase its powerful data processing capabilities. Through the 4G LTE Cat4 network, real-time traffic data flowed continuously to the control center. I was delighted to find that even during peak network congestion, SR520 maintained stable connections and quick responses.
What impressed me most was its VPN functionality. We used IPsec VPN to establish a secure communication tunnel, ensuring sensitive traffic data couldn’t be intercepted or tampered with. This not only enhanced system security but also put our IT team at ease.
Eyes of Wisdom: SR520’s Perfect Harmony with Traffic Cameras
Next came the deployment of traffic cameras. SR520’s high bandwidth and low latency characteristics shone here. High-definition video streams were transmitted smoothly to the control center, providing traffic management personnel with clear real-time road conditions.
Once, while I was debugging a camera at an intersection, it suddenly started pouring. I was worried about the equipment being affected, but SR520 continued to work steadily, unperturbed by the rain. At that moment, I became even more certain of how wise our choice had been.
Traffic Flow Like Silk: SR520 Empowering Vehicle Detection Systems
Vehicle detectors are another crucial component of intelligent transportation systems. SR520’s RS232/RS485 interface provided us with convenience in connecting various vehicle detectors. Through the Modbus RTU to Modbus TCP bridge function, we easily achieved the collection and transmission of detection data.

I remember one night when I was working overtime in the office analyzing data, I suddenly noticed abnormal traffic flow in a certain section. Through the real-time data transmitted by SR520, we quickly located the problem and promptly adjusted the traffic light timing, effectively alleviating traffic pressure. At that moment, I deeply felt the transformation that technology was bringing to the city.
Strategic Command: SR520’s Remote Management Advantages
As the system scale expanded, device management became a challenge. Fortunately, SR520 supports SNMP and cloud device management platforms, making remote centralized management a breeze. I could often check the status of each device and make configuration adjustments through my phone, greatly improving our work efficiency.

One late night, the system alarm indicated that an SR520 at an intersection was offline. Through the cloud platform, I quickly performed remote diagnostics and found it was due to a temporary power outage. I remotely restarted the device, and the problem was solved. Thinking about how I might have had to rush to the site in the middle of the night without this remote management capability, I couldn’t help but marvel at the convenience brought by technological progress.

Eyes of Wisdom: SR520’s Perfect Harmony with Traffic Cameras

Growth and Transformation: Continuous Optimization of SR520

As the project deepened, we continuously discovered new application potentials for SR520. Its Linux OpenWrt system provided us with ample space for secondary development. My team and I developed some customized functions based on SR520, such as a data analysis module tailored to local traffic characteristics, further enhancing the system’s intelligence level.
Whenever I see SR520 working silently at various intersections, supporting the entire city’s traffic operations, I feel a sense of mission and accomplishment. It’s like a dedicated traffic officer, guarding the city’s pulse day and night.
A Promising Future: SR520 and the Beautiful Vision of Smart Cities

Today, our intelligent transportation system has become a calling card for the city, attracting many other cities to visit and learn. Looking back on this journey, SR520 has played an indispensable role. It’s not just a hardware device, but an important cornerstone of smart cities.
Looking to the future, I believe SR520 will continue to excel in more fields. Whether it’s smart street lighting, environmental monitoring, or emergency communications, it can play a crucial role. As a member of Yeaplink, I feel immensely proud to be part of such innovation.
SR520 has allowed me to witness how technology can change cities and lives. It’s not just a product, but a crystallization of countless engineers’ wisdom and efforts. Whenever I pass those intersections guarded by SR520, seeing the orderly flow of traffic and relaxed pedestrians, I feel a sense of warmth and emotion. This is the power of technology, and it’s the goal we at Yeaplink constantly pursue – to make cities smarter and life better.