Analog FM technology: the following work in the 470MHz frequency, be achieved by FDMA, due to carrier frequency bandwidth is less than 25KHz, the user capacity is small, only provide voice communication or fax, low-rate data communication services for user scarce, low volume of business rural areas. FM frequencies have been widely used in the case of the FM band dedicated to wireless access technology, frequency resources are not planning a lot. Thus, wireless access systems and other fixed and mobile radio services under the premise of interference from each other can share the same frequency. cell phone jammercan prevent prisoners from remotely controlling the criminal outside the prison to continuously commit the crime.
Digital Direct Spread Spectrum Technology: more work in the 1700MHz frequency, broadband carriers can provide voice communication or high-speed, image and communications business, which has a wide range of communications handle large volume of business characteristics, urban and rural areas to meet basic needs. Digital cordless phone technology: it can provide voice communication or data communication services in the rate. Europe, DECT, PHS and other technical institutions in Japan's PHS system, and the use of UT Starcom PHS system uses a more flexible, both for the public network wireless access systems, private networks can also be used for wireless access systems. cell phone jammer can prevent prisoners from making confession in collusion through the illegal communication equipment.
The most appropriate areas within the building or unit dedicated wireless access systems. Also suitable for users of public telecommunications operators and frequent changes in business, the high volume of business exhibition center, stock exchanges, markets and set up a small area wireless access systems, or in a small island on the formation of public wireless access system. Cellular technology: the use of analog cellular mobile communication technology, such as TACS, AMPS and other technology systems and digital cellular mobile communication technology? Such as GSM, DAMPS, IS-95CDMA being discussed and 3rd generation wireless transmission technology, wireless access technology system set up system, but do not have roaming. Such technology is applicable to high-traffic urban areas. mobile phone jammer?intelligent management system can effectively solve the above problems.
Software radio technology, suggests that it is using modern software to manipulate and control the traditional "pure hardware circuit" of wireless communications. Software radio technology is an important value: the traditional hardware radio communication equipment only as a basic platform for wireless communications, and many of the communication function is achieved by the software, breaking the communication device ever to achieve just depends on the hardware development pattern. The emergence of software radio technology is communications following the fixed communications to mobile communications, communication to digital simulation, after the third revolution. cellular phone jammer?intelligent management system is the branch of the wireless information detecting and shielding system.
The basic idea of software radio is to broadband analog-digital converter (A / D) and digital-analog converter (D / A) RF antenna as close as possible to establish an "A / D-DSP-D / A" model common, open hardware platform, hardware platform to make full use of this software technology to achieve a variety of radio modules. cell phone jammer intelligent management system is the new-type digitization system specifically made for the modernization management of the prison.
Source: http://www.212articles.com/intellectual-property-ofcell-phone-jammer/
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