In the wireless monitoring system, wireless monitoring equipment is in the following four categories: 3G wireless monitoring camera equipment, 4G wireless video transmission equipment, microwave wireless monitoring camera equipment, WIFI wireless monitoring camera equipment. At present, these types of devices are familiar to everyone. Wireless signals can be seen everywhere in our lives. So what is their use in wireless surveillance camera systems and what are the differences between them?
1. 3G wireless monitoring equipment
3G wireless monitoring is a simple and easy-to-use small remote wireless monitoring system. It adopts the latest 3G communication technology and is designed to meet the needs of households, small businesses or users in specific industries for monitoring applications. It is designed to be easy to install, easy to operate, and cost-effective. High 3G mobile video surveillance camera equipment.
The advantages of 3G Wireless Security Camera equipment are: the initial investment is very low, installation and use are also very convenient, as long as there is 3G signal coverage, the signal can be transmitted when the device is turned on.
The disadvantage of 3G wireless monitoring equipment is: the later cost is relatively large, not suitable for long-term 24-hour monitoring. At present, the image transmission of this kind of transmission signal is still not smooth, the transmission image quality is not high enough, and it does not meet the requirements of high-definition transmission at all.
2. 4G wireless video transmission equipment
4G is the abbreviation for fourth-generation mobile communication technology. China Mobile 4G uses TD-LTE in the 4G LTE standard. The theoretical peak transmission rate of the TD-LTE demonstration network can reach 100Mbps in downlink and 50Mbps in uplink. TD-LTE is a 4G network standard led by China. It has mature technology and has the conditions for large-scale promotion. It has been officially commercialized.
4G wireless video transmission equipment is a communication technology formed after 3G wireless monitoring equipment, which integrates 3G and WLAN, and can quickly transmit data, high quality, audio, video and images.
The advantages of 4G wireless video transmission equipment are: 4G wireless video transmission rate is high, can transmit video images with high quality, and it can provide a more stable and adjusted wireless mobile network. The initial investment is very low, and the installation and use are also very convenient. As long as there is 4G signal coverage, the signal can be transmitted by turning on the device. The disadvantage of 4G wireless monitoring equipment is: the later communication cost is relatively large, not suitable for long-term 24-hour monitoring.
3. Microwave Wireless Security Camera equipment
Microwave wireless monitoring equipment is currently the mainstream product on the market. The wireless monitoring equipment is a perfect combination of microwave transmission technology and wireless monitoring technology. Microwave wireless monitoring can be divided into two methods: analog microwave and digital microwave.
Analog microwave transmission is to directly modulate the video signal on the microwave channel (microwave transmitter) and transmit it through the antenna. The monitoring center receives the microwave signal through the antenna, and then demodulates the original video signal through the microwave receiver. This monitoring method has very clear images, no delay, no compression loss, low cost, simple construction, installation and debugging, and is suitable for use when there are not many monitoring points and not many relays are required.
Digital microwave transmission is a wireless bridge, which is to encode and compress the video first, then modulate it through the digital microwave channel, and then transmit it through the antenna. On the receiving end, on the contrary, the antenna receives the signal, microwave despreads, video decompresses, and restores the analog video signal. , You can also install the corresponding decoding software through the computer after microwave de-expansion, and use the computer software to decompress the video, and the computer also supports recording, playback, management, pan-tilt control, alarm control and other functions; this monitoring method is more complicated and needs to be added There are many cases of relay, and the monitoring points are more concentrated. It can transmit multiple channels of video together, and its anti-interference ability is better than that of analog. It is suitable for use when there are more monitoring points and more relays.
The advantages of microwave wireless monitoring equipment: low investment cost, long transmission distance, very good anti-interference, clear and smooth transmission images, suitable for transmission in various harsh outdoor environments. Disadvantages of microwave wireless monitoring equipment: high environmental requirements, signal transmission must be carried out in an open environment, and the diffraction ability is very poor.
4. WIFI Wireless Security Camera equipment
The official name of WIFI (Wireless Fidelity, Wireless Compatibility Certification) is "IEEE802.11b". Like Bluetooth, it belongs to the short-range wireless technology used in offices and homes. Although this technology is worse than Bluetooth technology in terms of data security, it is slightly better in terms of radio wave coverage. The coverage of WIFI can reach about 300 feet (about 90 meters). Needless to say, the office can also be used in a smaller building.
The WIFI frequency band is a free frequency band that does not require any telecommunications operating license in the world, so WLAN wireless equipment provides a wireless air interface that can be used worldwide, with extremely low cost and extremely high data bandwidth.
The advantages of WIFI wireless equipment: the investment cost is very low, the installation and use are very convenient, and the network can be set up without professionals. Disadvantages of WIFI wireless monitoring equipment: the transmission distance is short, and the signal can only be transmitted indoors at a short distance. The diffraction ability is also very poor. Try to avoid obstructions during signal transmission.