Now more and more mature wireless surveillance industry, the market is very hot. 4G Cell Phone Jammer The current market is roughly divided into two large wireless monitoring types: one is the 3G wireless monitoring; another carrier is WIFI wireless monitoring. Now many users in the choice of wireless monitoring is not very clear which approach is more suitable in the hands of the project, under the following fundamental difference between the two terms, in order for your choice. http://www.4gcellphonejammers.com/
1 3G wireless monitoring 4g cell phone jammer
2G and 3G divided in two ways; one is the earlier 2G mode test, the other is the latest version of the 3G model.
(1) 2G wireless monitoring 4g cell phone jammer
Its transmission methods include CDMA, GSM mode. The two modes of lower hardware costs, coverage, transmission speed, the theoretical value of the transmission rate of up to 153.6Kbps, substantially in the actual use only reached 60 ~ 80Kbps. Because the video image to the bottom requires 512Kbps smooth transmission, this speed is far less than the video requirements. Therefore, wireless monitoring projects, very few manufacturers to choose. 4g cell phone jammer Another drawback is the biggest traffic charges operators charge too high, monthly, annually, will generate substantial costs. Generally only in very remote, WIFI wireless devices impossible situation and will consider certain funds.
(2) 3G wireless monitoring
Adoption of mobile (TD-SCDMA), telecommunications (CDMA2000 EVDO), China Unicom (WCDMA) 3G technologies carriers access from 2009 onwards, by the operators to promote, many monitor manufacturers for research and development related to this area products. The prominent advantage of 3G high-speed download capability that is ideal value can reach transfer rates 3Kbps ~ 20Mbps, but is currently still in its promotion stage, so the transmission rate to be further research in this area. Existing 3G wireless bandwidth limited capacity, access to the user is limited, when the extended defects such as in the case of multi-user sharing, it is difficult to ensure the flow of charge rates and a wireless video surveillance delay requirements, the main drawback is the high charge carriers, general customers can not accept it.
2 WIFI wireless monitoring
WIFI wireless monitoring is divided into two ways; one is analog wireless surveillance; the other is a digital wireless monitoring. 4g cell phone jammer
(1) analog wireless surveillance
The video signal is directly modulated on the 1G or 2.4G wireless channels via the antenna out, the monitoring center receives a radio signal through the antenna, and then demodulated by the radio receiver of the original video signal, the monitor mode is not compressed such losses, almost no delay, so you can ensure that the video quality, but it is only suitable for point-close (1KM less) single-channel transmission, not suitable for scale deployments. Also because there is no modulation during calibration, poor immunity, less frequency, so in the case of the radio signal environment is complex itself will have a lot of interference, causing an image disorder, loss, and so on. Therefore, in the case of multiple-channel images to be transmitted is not recommended to use this mode transmission. 4g cell phone jammer
(2) digital wireless monitoring
Is the first video signal encoding compression via digital radio channel modulation (2.3G / 2.4G / 5.8G, etc.), and then use the antenna out. The receiving end on the contrary, the signal received by the antenna, then despreading and wireless video decompression, and finally reduced to an analog video signal transmission out, this approach is currently used in many domestic markets. The scalability of large digital microwave communication capacity of at least dozens of channels available and relatively easy to construct, high communication efficiency, the use of flexible. Digital radio has advantages over analog radio can not, as a large area (5-30 kilometers) to monitor multiple points (5-500 points) need to add multiple relay case, the situation is complex and the source of interference for a long time using wifi base station Center together with the base station transmit front-end CPE equipment cost is very high. Digital wireless capacity, strong anti-interference ability, confidentiality, and the same transmit power over longer distances, less affected by terrain or obstacles, rich interfaces, scalability and strong.
Of course, 4g cell phone jammer different wireless transmission technology has its own suitable place. Such as in factories, oil fields, border, forests, etc., using WiFi wireless monitoring more, with the widespread demand for 3G upgrade all aspects of performance, decrease traffic costs, mature network environment, as well as a wide range of wireless monitoring, and will encourage further use of 3G.
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