When building an industrial Internet of Things IIoT system, a high-performance wireless bridge is a key device for connecting various nodes and achieving efficient data transmission. In order to ensure that the wireless bridge can meet your specific needs, here are some suggestions for purchasing based on professional perspectives:

1. Define the operating frequency
   Wireless bridges mainly have two working frequencies: 2.4GHz and 5.8GHz. The 2.4GHz band has good compatibility and strong diffraction capability, but its anti-interference capability is relatively weak. It is suitable for use in scenarios with relatively simple electromagnetic environments and low requirements for transmission distance. The 5.8GHz band has strong anti-interference capability and long transmission distance, but its diffraction ability is poor, making it suitable for use in industrial environments with high electromagnetic interference and long-distance transmission requirements. Therefore, when purchasing, the most suitable operating frequency should be selected according to the specific application scenario.

2. Evaluate the transmission rate
   The transmission rate is an important indicator for measuring the performance of a wireless bridge, usually measured in Mbps (megabits per second). Different application scenarios have different requirements for transmission rate. For example, in an industrial environment with a large amount of data transmission, it is necessary to choose a wireless bridge with a high transmission rate to ensure the real-time and integrity of the data. Common transmission rates include 150Mbps, 300Mbps, 450Mbps, 600Mbps, 900Mbps, etc. You can choose according to your actual needs.

3. Pay attention to antenna performance
   Antenna is an important accessory of wireless bridge, responsible for the transmission and reception of wireless signals. The type of antenna, such as omnidirectional antenna, directional antenna, and gain, directly affects the performance of the wireless bridge. The larger the gain, the wider the coverage area of the wireless bridge and the farther the transmission distance. When selecting, the most suitable antenna type and gain should be chosen based on the actual layout and transmission requirements.

4. Consider the power supply mode
   Since wireless bridges are usually deployed outdoors or in environments where it is difficult to access power, the power supply method becomes an important consideration. Wireless bridges that support PoE Power over Ethernet can simplify cabling and reduce costs, making them a good choice. For areas with sparse population or difficult access to power supply, renewable energy sources such as solar or wind energy can also be considered for power supply.

5. Emphasis on safety
   In the Internet of Things system, security is of utmost importance. Wireless bridges need to set passwords or encrypt wireless signals to prevent unauthorized access and data leakage. When selecting, pay attention to the security performance of the wireless bridge to ensure that it supports advanced encryption standards such as WPA2 and WPA3.

6. Pay attention to waterproof and heat resistance performance
   Wireless bridges in the industrial IoT environment often face harsh weather conditions and complex working environments. Therefore, waterproof, dustproof, heat-resistant and anti-condensation performance are factors that cannot be ignored when selecting a wireless bridge. Ensure that the selected equipment can operate stably in harsh environments and extend its service life.

7. Evaluate stability and reliability
   The stability and reliability of the wireless bridge directly affect the performance of the entire IoT system. When purchasing, you should pay attention to the hardware quality of the wireless bridge, such as chips, motherboards, memory, and the technical strength and after-sales service of the manufacturer. Choosing well-known brands and products with good reputation can ensure the stability and reliability of the equipment.

8. Consider the transmission distance and coverage range
   According to the actual scale and layout of the industrial Internet of Things system, select a suitable wireless bridge with a transmission distance and coverage range. Ensure that the maximum transmission distance of the selected device is greater than the actual monitoring transmission distance to meet the needs of complex application scenarios.

9. Cost-effectiveness considerations
   On the premise of meeting performance requirements, cost performance is an important factor that cannot be ignored when purchasing a wireless bridge. According to actual needs, choose cost-effective products that meet performance requirements and save investment costs.

When purchasing a high-performance wireless bridge, it is necessary to consider multiple factors such as operating frequency, transmission rate, antenna performance, power supply method, safety, waterproof and heat resistance, stability and reliability, transmission distance and coverage, and cost-effectiveness. By comprehensively evaluating these factors, you can choose the wireless bridge that best suits your needs, providing a solid foundation for the construction of an industrial IoT system.