Communication equipment PCB assembly

     Communication equipment (Industrial Communication Device, ICD) is a general term for communication equipment installed in a certain area to transmit radio wave information, mainly divided into wired communication equipment and wireless communication equipment. Wired communication equipment mainly introduces solutions to serial communication on industrial sites, professional bus communication, industrial Ethernet communication and conversion equipment between various communication protocols. Wireless communication equipment is mainly wireless AP, wireless bridge, wireless network card, wireless lightning arrester, antenna and other equipment.

Introduction

     Communication equipment (Industrial Communication Device, ICD) refers to the collective designation of communication equipment set up in a certain area to transmit radio wave information. Such as radio transmission towers, TV transmission towers, transceivers, telephone exchanges, communication lines, satellite communication equipment, etc.

Classification

    Communication equipment is mainly divided into wired communication equipment and wireless communication equipment.

    Wired communication equipment mainly introduces solutions to serial communication on industrial sites, professional bus communication, industrial Ethernet communication and conversion equipment between various communication protocols.

    Wireless communication equipment is mainly wireless AP, wireless bridge, wireless network card, wireless lightning arrester, antenna and other equipment.

Simplex: Remotes of all kinds.

Half-duplex: walkie-talkie.

Full-duplex: home telephone landline (local), mobile phone, computer, modem, radio, satellite phone (maritime phone), etc.

In a broad sense: TV, radio, satellite signal transmitters and receivers, various wireless industrial/building control systems, radar, sonar, etc., all have communication circuit modules in them.

WiFi

    Standing for Wireless Fidelity, it is a short-range wireless technology used in offices and homes. The technology uses the frequency band near 2.4GHz, which is currently an unlicensed wireless frequency band. WiFi communication devices follow the IEEE 802.11 protocol, and the currently widely used standards are: 802.11a, 802.11b, 802.11g, and 802.11n. The so-called WiFi communication equipment should refer to the communication equipment supporting this technology.

Electromagnetic waves

    The theory of electromagnetic waves was founded by Maxwell. It was the Italian Marconi who invented telegraph communication equipment based on electromagnetic waves, and Bell was the one who invented the telephone.

    Wireless communication uses radio waves instead of cables to achieve communication between devices. This communication method has the advantages of fast and simple installation and maintenance, not affected by the site terrain environment, and low cost. The rich products can meet the needs of users in terms of communication distance and communication. Different speed requirements.

    Wireless communication equipment: ASK modulator, used to use data signal ASK-modulated carrier; and QPSK modulator, used to use I-signal and Q-signal QPSK-modulated carrier; in wireless communication equipment with ASK modulation and QPSK modulation functions In , where the device can be manufactured at low cost and is not large in size, one output terminal of the QPSK modulator is connected to the carrier input terminal of the ASK modulator through a switch. And, the antenna is connected to the output terminal of the ASK modulator through a switch. Furthermore, a mixer is placed between the switch and the . The switch connects the QPSK modulator and the ASK modulator when transmitting, and it connects the QPSK modulator and the mixer when receiving. The switch connects the ASK modulator to the antenna when transmitting and the antenna to the mixer when receiving. Thus, at the time of transmission, an ASK-modulated wave or a QPSK-modulated wave is output using the ASK modulator and the QPSK modulator. When receiving, the sine wave is output by the QPSK modulator, and the data signal is down-converted, detected or demodulated by the mixer.

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