英语演讲_通讯产业发展.pptVIP

The development of communications industry;30 years since the reform and opening up, Chinas communications industry has undergone enormous changes;Seventies;Eighties;In 1983, Shanghai opened the first domestic paging station, BP machine to enter China.Pager just appear to have a pager is admirable, to become a big time, many people wish to have a pager. From BP machine of instant communication, people into the era without the temporal and spatial distance, always and everywhere to be found, greatly accelerated the way people live, work efficiency, but also people with nowhere to hide. It is a love-hate relationship, but have been without it.;The first Big Brother is a Motorola 3200.The battery is fully charged it can only maintain 30 minutes of talk. Mobile entered the era of mobile communications. 1987 standards for mobile communication with Hong Kong and Macao, Guangdong, take the lead in building a 900MHz analog mobile phone. Big Brother than fax the BP machine faster outdated. In June 2001, China Mobile Communications completely shut down the analog mobile phone network, so Big Brother to become history.;On the mid-1990s Big Brother is no longer popular, black and white screen cell phones to portable, affordable, quickly accepted by many people, officially entered the life of common people to enter the merchant business negotiations. GSM ACTmobile.;In January 1998, Zhejiang Yuhang District, the official opening of the PHS. The one-way fee, a monthly fee of ￥ 20, charges 0.2 yuan per minute. Due to the tariff is relatively low-cost mobile phones, PHS users in China to grow significantly in 2005 and reached up to nearly a billion. Because the the PHS network of band may interfere with the TD-SCDMA system, the Ministry of Industry and requirements of China Telecom and China Unicom frequency back network work completed before the end of 2011.;The third generation mobile communication technology, cellular mobile communications technology to support high-speed data t