A typical representative of first-generation mobile phone system is the United States six 1 ^ 1? 3 system and subsequently improved system Ding eight 08 Apple 5S backlight recycling, as well as small and XV \ Tintin and the like. Advanced Mobile Phone System) use analog cellular transmission 'lose 800 bands, are widely used in the Americas and parts of the Pacific Rim countries; DING eight people omnidirectional Mobile System) is a 1980s European standard analog mobile phones, but also China 80 s using analog mobile phone standard of professional mobile phone backlight recycling, using 900 bands. Nordic Sweden also opened a small XV ('out mobile phone) system, the German opening 0-450 system. The first-generation mobile phone system is analogue, with eight technology. Second-generation mobile phone system based on the transmission of voice and data-based digital mobile phone system, mobile phone backlight recycling companies, a typical system has 031 ^ 1 (using small 0X4 eight eight eight ways ... ??, 13-95001 ^ VIII and Japan now renamed as? 00 and other digital mobile phone system .20 In addition to providing voice phone service outside can also provide low-speed data services and short message service. Global System for Mobile> series are 031 ^ 1900,0031800 and? 031,900 three parts, The main difference is the difference between the three operating bands can be attributed to its characteristics: ^ high spectral efficiency: As a result of efficient modulators, channel coding, interleaving, equalization, and speech coding technology, the system has a high spectrum efficiency of the system phone quality is better: soft switching technology (connect to disconnect) can overcome the disadvantages of hard switching easily dropped calls, 00 ^ 1 six systems operating on the same frequency and bandwidth, the system is easier to achieve soft switching technology backlight recycling, thereby improve the quality of the phone system uses to determine the vocoder rate adaptive threshold technology, powerful error correction, soft-switching technology and rake diversity receiver that provides Ding 0? ^ six systems can not match, a high phone quality ^ frequency planning flexible: users in different serial number to distinguish the different [eight carriers in the adjacent cell can use, so the frequency of 001 ^ eight network planning flexible, simple extensions for multimedia mobile phone system ^ VI. the system can easily use more than 00 ^ 1 eight-channel mode and multi-mode 001 ^ eight, carry different rate requirements of multimedia business information, treatment and synthetically than 01 ^ 1 small way and eight-way flexible, simple, there are multimedia mobile phone system in favor of the application of the third generation mobile phone system to play 31! 00,30, also known as the European Union's telecommunications giants claimed it as 01 ^ 1 Ding universal mobile phone system>. It can be a voice phone and multimedia mobile phone combined with its possible value-added services will include images, music, web browsing, video conferencing and other information services .30 means that globally applicable standards, new services, greater coverage, and more spectrum resources, to support more users. ^ 30 system with the existing 20 systems have fundamentally different system uses a .30 (technical and packet switching technology, techniques and circuit instead of 20 systems commonly used switching technology. In the circuit-switched transmission mode , regardless of whether the two sides talk talk, remain open during the on line, and bandwidth compared with the current 20 systems, 30 will support more users, higher transmission rate of information transfer rate of the system .30 at high speed Exercise can be achieved ,, walking movement reached 3841, up to 2 Apple 5S recovery backlit indoor sports, Heilongjiang backlight recycling, Obo Obo electronic is supplied by Shenzhen Electronic Technology Co., Ltd. Shenzhen City Aobo Electronic Technology Co., Ltd. (www.aobodz .com) strong, credible, in other industries in Shenzhen, Guangdong has accumulated a large number of loyal customers. The company better work attitude and continuously improve innovative ideas will lead Obo electrons into the brilliant and you work for a better future!