In the field of IIoT, the importance of 4G modem as a bridge connecting devices and networks is self-evident. A suitable 4G modem can not only ensure the stable operation of the system, but also achieve efficient and reliable data transmission, providing strong support for the intelligent transformation of enterprises. However, faced with a wide range of 4G modems on the market, how to make a wise choice has become a difficult problem for many enterprises. Therefore, we have carefully prepared this 4G modem selection guide to provide you with comprehensive and professional guidance during the selection process.

1. Integrity of functional requirements

Core function: Ensure that the 4G modem supports dynamic domain name, master and slave centers, wake-up, SMS channel, remote configuration, and remote upgrade functions. These functions are crucial for achieving remote management and maintenance of equipment.
Network support: Select a 4G modem that supports mobile, Unicom, and telecommunications networks, and choose the appropriate 2G/3G/4G/5G network standard based on the signal strength on site.

2. Compatibility of Communication Interfaces

Interface type: 4g modem with terminal interface is preferred for easy access and stability. Support multiple interfaces such as RS232, RS485, RS422, TTL, etc., which can enhance the flexibility and compatibility of the system.
The more interfaces supported, the more advantages a 4G modem with more interfaces will have, which can meet the connection requirements of different devices and sensors.

3. Industrial Standard

Environmental adaptability: Select a 4G modem that meets industrial-grade standards, with wide temperature, wide voltage, power supply reverse protection, and high-voltage lightning strike and electrostatic protection functions. This can ensure the stable operation of the 4G modem in various harsh environments and extend its service life.
Stability and reliability: Industrial-grade 4G modems should have high stability and reliability, reducing failure rates and on-site dispatch costs.

4. Antenna and Signal Quality

Antenna type: Select the appropriate antenna type according to application requirements, such as snake-shaped inverted F antenna MIFA, inverted F antenna IFA, chip antenna, or wire antenna. Each antenna has its own unique performance and application scenarios.
Signal quality: Pay attention to parameters such as return loss, bandwidth, radiation efficiency, radiation pattern, and gain of the antenna to ensure the stability and quality of signal transmission.

5. After-sales Service and Technical Support

Brand selection: choose well-known brands and reputable manufacturers to ensure product quality and after-sales service.
Technical support: understand whether the manufacturer provides technical support and after-sales service nationwide, as well as response speed and service quality.
Application cases: view the past application cases and real product pictures provided by the manufacturer to understand the actual application effect of the product.

6. Certification and Test Report

Certification: Pay attention to whether the product has passed 3C certification, ISO certification, network access license and other authoritative certifications.
Test report: Check the electrostatic test report, lightning protection test report, etc. of the product to ensure the safety and reliability of the product.

7. Other Considerations

Extensibility: Consider the extensibility of the 4G modem, such as whether it supports advanced features like VPN private networks and heartbeat packet monitoring.
Cost-effectiveness: On the premise of ensuring performance and quality, consider cost-effectiveness and choose a cost-effective 4G modem.

Choosing the right 4G modem requires a comprehensive consideration of functional requirements, communication interfaces, industrial standards, antenna and signal quality, after-sales service and technical support, certification and test reports, and other factors. By comprehensively evaluating these factors, it can be ensured that the selected 4G modem meets the needs of industrial IoT applications and achieves efficient and stable data transmission.