It is evolved on the basis of the cellular system. Including GSM900MHz, GSM1800MHz and GSM1900MHz several frequency bands. The GSM system has several important features: burglar beat good capacity, network capacity, the number of resource-rich, clear talk, strong stability and less susceptible to interference, sensitive information, call dead space is less, the end of phone power consumption. It is actually a sort of ?gateway?, can China Unicom?s GSM network and CDMA network into one. Unicom?s GSM mobile phone users to change a dual-mode phone, you can enjoy the CDMA online data services, such as downloadable games, satellite positioning, e-mail. When users in countries with different mobile phone standard. CDMA signal can be shielded by ? cell phone jammer?? .
This system can automatically identify and converted to a compatible network. GPS is the abbreviation of GlobalPositioningSystem global satellite positioning system. GPS was initially used in military field. GPS is widely used in the transportation industry, which uses GPS positioning technology combined with wireless communication technology (GSM or CDMA), Geographic Information System (GIS) and other high-tech monitoring the vehicle after the digital channels of the GSM network. signal transmission to the vehicle control center, monitoring center location information conversion by difference technique. ? cell phone jammers? ? is green product.
Position signal through GIS map language is displayed, the vehicle positioning and navigation through the service center, anti-theft anti-robbery, services and rescue, remote monitoring, track records. PHS stands for Personal Handyphone System, is a Japanese R & D in digital mobile phone system to provide high-speed Internet access, high definition call quality, low rates and high quality ultra-low electromagnetic mobile call environment is ideal for frequent the downtown area, provide the same functionality with the GSM system, domestic PHS mostly using this system. WAP (Wireless Application the Protocol) Wireless Application Protocol is an open standard protocol.? cellphone jammer ? ? has no harm to the human health.
Use it can send information on the network to the mobile phone or other wireless communication terminal. WAP is Wireless Application Protocol Forum, was established in 1997 by Ericsson (ERICSSON,), Nokia (NOKIA), Motorola (MOTOROLA) and other communications industry giants (WAPForum) developed, which uses a markup language similar to HTML WML (WirelessMarkup Language), direct access to the general web and through WAP Gateway. Through WAP, anytime, anywhere using a wireless communication terminal to obtain real-time information on the Internet or the company?s Web site, the real wireless Internet access.?? phone jammer ?? is easy to operate.
CDMA is an abbreviation of CDMA (Code Division Multiple Access), it is the branch of the digital technology ? the spread-spectrum communication technology to develop a new wireless communications technology. It can meet the high demands of the market for mobile communication capacity and quality, with high spectrum efficiency, good voice quality, confidentiality, and low rate of dropped calls, electromagnetic radiation, large capacity, covering the broad characteristics can significantly reduce investment and reduce operating costs. The principle of CDMA technology is based on spread spectrum technology, will be transmitted with a certain signal bandwidth information and data, with a bandwidth much larger than the signal bandwidth, high-speed pseudo-random code modulation. Sparking of? cell phone jammer? when starting can be effectively avoided.
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Source: http://muhammadahmed.com/articles/12071
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