China began research and development paging system from 1983 to acquire a large number of phone boxes, on September 16 the same year, the band opened with 150 Shanghai China's first analog paging systems. May 1, 1984, the band opened with 150 Guangzhou China's first digital paging system. November 15, 1991, Shanghai first with 150 ^ a 2-band opened a Chinese character paging system. This kind of direct Chinese character display information content 'Han was' 8? Machine, eliminating the need to check the code of trouble, and clear, and therefore welcomed by users. Chinese display numeric paging and paging from the 1990s prevalent in our country, then the popularity of mobile phones, paging users gradually out of people's sight. After the early 1970s, Bell Labs, the concept and related theoretical coverage cells of the cellular system immediately rapid development of Sony z2 frame acquisition, and soon entered the practical stage. In a cellular network, each geographic scale (usually a medium-sized city and its suburbs] has a plurality of base stations, and controlled by a mobile telephone exchange in the car anywhere within this area of ??the mobile station, the mobile phone can be communicated via a wireless channel and switch public telephone network, truly anytime, anywhere with a mobile phone can be anywhere in the world. At the same time, between two or more mobile switching office, as long as the same standard can also be automated and Semi-automatic switching, thereby expanding the range of motion of the mobile station. Thus, in theory, a cellular mobile telephone system can accommodate an unlimited number of users. The first-generation analog cellular mobile telephone system is a cellular mobile telephone system, the main feature is analog transmit analog signals, the United States, Britain and Japan have developed their own systems. In 1975, the Federal Commission opened the phone box in the acquisition of the mobile phone market to determine the land mobile telephone handsets and high-capacity cellular mobile telephone spectrum for mobile Phone commercially ready. In 1979, Japan opened the world's first cellular mobile telephone network. In fact, the world's first mobile phone phone system was opened in Chicago in 1978, but came from behind to cellular mobile telephone handset in box acquiring company, in 1979, made six analog cellular mobile telephone system in the Chicago trial, and finally in December 1983 invested a lot of business in the United States to acquire the phone box |. Beijing middle frame acquisition | Obo electrons from Shenzhen City Aobo Electronic Technology Limited 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 constant Perfection innovative ideas will lead Obo electronic and you work into the brilliant, for a better future!