What are the differences between 3G wireless monitoring and WIFI wireless monitoring
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What are the differences between 3G wireless monitoring and WIFI wireless monitoring
With the gradual development of the monitoring industry, wireless monitoring eliminates the need for network cabling, reduces construction difficulties, and reduces line costs; installation locations are more flexible. Widely used in traffic control traffic and camera transmission, bus monitoring, highway monitoring, environmental testing, vehicle-mounted mobile, fire-fighting channels, integrated alarm and other video surveillance. In today's life plays a pivotal role.
What are the similarities and differences between 3G wireless monitoring and WIFI wireless monitoring?
3G wireless monitoring
Strictly speaking, it is divided into 2G and 3G modes; one is the earlier 2G model test, and the other is the latest version of the 3G model test.
1, 2G wireless monitoring and transmission methods mainly include CDMA and GSM modes. The hardware cost of these two modes is low, the coverage is large, the transmission speed is slow, the theoretical value transmission rate is the highest 153.6Kbps, and only 60~80Kbps in actual use. Because video images require 512Kbps for smooth video transmission, this speed is far from video requirements. Therefore, in the wireless monitoring project, few manufacturers choose to use it.
2. 3G wireless monitoring adopts 3G technology access methods of mobile (TD-SCDMA), telecommunications (CDMA2000EVDO) and China Unicom (WCDMA) operators. Since 2009, it has been vigorously promoted by various operators, and many monitoring manufacturers have already Develop related products for this area. The outstanding advantages of 3G are its high-speed download capability, and its ideal value can reach 3Kbps~20Mbps.
With the promotion and popularization of 4G networks, 4G wireless monitoring has also surpassed the market. Its fluency can be the same as a normal bandwidth network, and video images can be transmitted smoothly.
WIFI wireless monitoring
Strictly speaking, WIFI wireless monitoring is divided into two methods; one is analog wireless monitoring; the other is digital wireless monitoring.
1, analog wireless monitoring is to directly modulate the video signal in the 2.4G or 1G wireless channel, through the antenna, the monitoring center through the antenna to receive wireless signals, and then through the wireless receiver demodulated the original video signal, this monitoring The method has no compression loss and almost no delay, so the video quality can be guaranteed, but it is only suitable for point-to-point close-range (within 1KM) single-channel transmission and is not suitable for scale deployment.
In addition, because there is no modulation and calibration process, the anti-jamming performance is poor and the frequency is small. Therefore, in the case of a complex wireless signal environment, it will cause great interference, resulting in image confusion and loss. Therefore, it is not recommended to transmit in this way when there are multiple images to be transmitted.
2. Digital wireless surveillance is to encode and compress the video signal first, and then modulate the digital wireless channel (2.3G/2.4G/5.8G, etc.) and then use the antenna to transmit it. On the other hand, the receiving end receives the signal from the antenna, then despreads wirelessly and decompresses the video, and finally returns to the analog video signal. This method is also widely used in the domestic market. The scalability of digital microwaves is large, and the communication capacity can use dozens of channels at least, and the construction is relatively easy, the communication efficiency is high, and the application is flexible.
Digital wireless has the advantages of analog wireless, such as large area (5-30 square kilometers), many monitoring points (5-500 points) need to add more relay situations, the situation is complicated and the interference source is often used LP5800-WBSWIFI The base station is centered with the base station front-end CPE equipment and the transmission cost performance is very high. The digital radio has large capacity, strong anti-jamming capability, good confidentiality, the same transmission power transmission distance, less influence by terrain or obstacles, rich interfaces, and strong expansion capability.
Of course, different wireless transmission technologies have their own applicable places. For example, in the factories, oil fields, border defense, forests, etc., with the improvement of various aspects of 3G4G network performance, the decline in traffic costs, the maturity of the network environment, and the general demand for large-scale wireless monitoring, it will also promote the further use of 3G4G wireless monitoring.