Use program of cell phone jammer intelligent system

Gradually complete industrial environmental support: Taiwan handset industry input, Bluetooth, the wireless communications will gradually build a complete upstream and downstream and industry, the layout is conducive to the WLAN. WLAN can be defined broader perspective, such as Bluetooth, HomeRF, IEEE802.11 and HiperLAN, etc. Here we adopt a more narrow view, will be positioned in the enterprise WLAN market with 802.11 and HiperLAN, etc., of course, in the case of affordable , these products have the opportunity to play an active role in the home market. So that the cell phone cannot receive data from the base station or connect with the base station because ofcell phone jammer intelligent system.
The main WLAN technology and standards department from IEEE802.11, given the end of 1997, was to allow the coexistence of two technologies, each successive renewal Spectrum (DSSS) and frequency hopping spread spectrum (FHSS) two. However, the transmission speed of 802.11 only 2Mbps, relative to the mainstream market for Ethernet transfer is from 10Mbps to 100Mbps, a far cry, and the price is expensive, difficult to be accepted by the market, so the industry will be actively engaged in the 802.11b standard, the speed increased to 11Mbps. CD FHSS, although the hardware is cheaper, but the speed is not easy to improve, the need for greater bandwidth; DSSS and FHSS just the opposite. Then only use 802.11b DSSS, FHSS original use of the 802.11 industry turned to HomeRF, change to the home market for the new position, put forward the demands of low-cost solution. This kind ofcell phone jammerintelligent system is also the negative safe protection equipment.
802.11b standard established in 1999. Either 802.11 or 802.11b, are using the 2.4GHz band. In 1985 the U.S. FCC mandate Needless to apply for a license for three frequency bands for industrial, scientific and medical purposes, referred to as the ISM band, respectively, fall 900MHz (902 ~ 928 MHz, bandwidth 26 MHz), 2.4GHz (2.400 ~ 2.4805 GHz, bandwidth of 125 MHz) and 5 GHz (5.725 ~ 5.850 GHz, bandwidth of 125 MHz). HomeRF, Bluetooth and 802.11,802.11 b are locked in the 2.4 GHz, 2.4 GHz RF to wireless communication technology-based development since 1999, became the hottest topic of network. At the same time, wireless monitoring camera, alarm and so on ofcell phone jammerintelligent system will be extended.
But some industry-based for 2.4GHz WLAN hold a skeptical attitude, this segment covers the chipset market has been Intersil and Lucent and other industry-exclusive, new entrants have limited resources and difficult to compete with them, and secondly, the WLAN If longer improve transmission speed, not bound to meet more applications. Although the 2.4GHz WLAN in the next climb to more than 20MHz speed, but not easy to reach. Some businesses are then directly select 5GHz, towards the high-speed efforts to get rid of differences in both the industry's sphere of influence. In the 5GHz band, the speed can be increased to at least 24Mbps, MPEG2 can send the information has been, both in the enterprise market or home application on the market are capable of. PC of cell phone jammer intelligent system will record the information for the future inquiry through the pre-installed net line.
On the 5 GHz WLAN standards, there are two, one IEEE802.11a, the second is HiperLAN2. HiperLAN2 is located in the building and the city's application, mainly by Nokia, Ericsson, Bosch, TI, Dell, and Telia and other European joint initiative by the industry; to European Telecommunications Standards Institute (ETSI) official standards, the initial commercialization of products possible speed as 25Mbps, the future will be increased to 155 Mbps, as ATM OC-3 short-range wireless link. HiperLAN2 802.11a similar version of the U.S. regulations, in addition to the band approximation and using the same OFDM modulation technique and physical layer (PHY), the biggest difference is just in the media access control (MAC) only. Use program of cell phone jammer intelligent system will be described in details.