How does 4g modem with ethernet port work

A modem is a type of computer hardware that can translate a computer ’s digital signals into analog signals that can be transmitted along ordinary telephone lines, and these analog signals can be received by another modem at the other end of the line and translated into a language that the computer can understand. . This simple process completes the communication between the two computers.

Modulation and demodulation is a very important thing in communication and is almost indispensable. The original information is often not suitable for propagation in the channel, and it needs to be converted into a form suitable for propagation. Modulation is one of the most important conversion methods. The reverse process is called demodulation.

So how does it work? Take the mobile phone that everyone usually uses as an example. See how your cell phone communicates with the base station?

The CPU needs to send the command to the baseband processor, which is responsible for packaging the data to be transmitted into a packet that conforms to the cellular network communication protocol, and then sends it to the wireless transceiver-this wireless transceiver is a so-called modem It will convert the packet in the digital signal into an analog signal and load it on the carrier. Here "loaded on the carrier" is the modulation

Similarly, the protocol used to convert the signal of the network cable (here generally referred to as ether (net) to fiber / telephone line) has a similar process, except that their modulation does not necessarily put the baseband on the carrier That (analog) modulation. There are also digital modulation, such as PWM, 8b10b code (commonly used fiber)

With the rapid development of the communications industry today, modems are indispensable, but they exist in many forms. For example, the current 4g modem with ethernet port. It can not only complete demodulation work, but also meet all the functions of industrial routers, and has become an indispensable device for the Internet of Things.

The 4g modem with ethernet port has a built-in industrial wireless module with a sim card slot and supports a variety of network flexible choices: China Unicom, China Telecom, China Mobile, China Broadcasting and other 2G / 3G / 4G networks. Widely used in the M2M / IoT industry in the Internet of Things industry chain, such as smart grid, smart transportation, smart home, finance, mobile POS terminals, supply chain automation, industrial automation, smart buildings, fire protection, public safety, environmental protection, weather Digital medicine, remote sensing survey, military, space exploration, agriculture, forestry, water affairs, coal mine, petrochemical and other fields.

Written by Owen