Program controlled exchange refers to a telephone exchange that utilizes modern computer technology to complete control, connection, and other tasks. Compared to manual switches, program controlled switches can improve communication quality, increase switching capacity, and reduce maintenance costs. Widely used in various types of telephone networks such as urban telephone networks, mobile communication networks, and internal communication within enterprises.

A wireless base station is a telecommunications infrastructure that communicates by transmitting and receiving wireless signals. In small enclosed hotspots or signal blind spots, multiple small wireless base station devices can effectively supplement the insufficient signal coverage of outdoor wide area base stations, ensuring network service quality and wireless communication quality. Meet the needs of users in densely populated indoor areas such as mines, parks, warehouses, shopping malls, subways, and stations for high-density connectivity and high-frequency communication.

The intelligent wireless DTU (Data Transfer Unit) is a wireless terminal device specially used to convert serial port data into IP data or IP data into serial port data, and transmit them through wireless communication network. It realizes bidirectional wireless data transmission between front-end equipment and background center. It is one of the most frequently used products in Internet of Things communication equipment. It is often used in petroleum, petrochemical, mining and other occasions where wireless data transmission is required but wiring is inconvenient.

As 5G network operating frequency bands are allocated higher and higher, the coverage depth of outdoor base stations for indoors is becoming increasingly insufficient. In densely populated areas such as hotels, shopping malls, office buildings, etc., room division equipment is needed to evenly distribute the source signal to the indoor area to be covered, so as to improve the indoor mobile communication environment.

Radio waves refer to electromagnetic waves in the radio frequency band that propagate in free space (including air and vacuum). Through radio monitoring stations, radio waves can be discovered, located, tracked, recorded, and monitored. In order to standardize radio management and investigate illegal radios in a timely manner, in addition to ordinary base station monitoring, radio monitoring vehicles are also needed to improve the mobility of monitoring and make up for the lack of coverage of fixed monitoring stations. The radio monitoring vehicle integrates the main part of the fixed station and can be moved flexibly. It is mainly used for on-site radio monitoring in large-scale activities such as the college entrance examination.