In February this year, at the Barcelona World Communications Conference, China Mobile executives announced the three-year development goals of TD-LTE. Among them, the target for 2012 is 20,000 TD-LTE base stations, and the number of TD-LTE base stations will reach 200,000 in 2013. , And the scale of this network is expected to double. At the above meeting, GTI operators issued a GTI action declaration, which determined that by 2014, the number of TD-LTE base stations in the world would reach 500,000, with more than 100 terminals, covering a population of more than 2 billion people. Hangzhou is one of the first batch of TD-LTE scale technology test network cities in the country. While building a scale technology test network, China Mobile builds on the existing TD-SCDMA network and builds a TD-LTE network through dual-mode evolution and upgrade. Add a set of boards, add a pair of optical fibers, and a software upgrade "to upgrade from 3G stations to 3G / 4G dual-mode base stations. Compared with the newly built TD-LTE base station system of the scale technology test network, the supporting construction cost is reduced by 70% and the construction time is saved by 90%. On March 30, China Mobile launched the TD-LTE experience in Hangzhou. On June 18, the Hangzhou TD-LTE network realized two-way roaming with the Hong Kong LTE FDD network. This year, Hangzhou completed the construction of 2,400 TD-LTE sites, covering an area of ​​500 square kilometers and covering a population of 5 million. In Hong Kong, China Mobile launched the world ’s first LTE converged network on December 18, which integrates China Mobile ’s existing LTE FDD network with TD-LTE, greatly increasing the overall network capacity to meet the rapid increase Mobile data needs. On March 2, the first commercial GSM upgrade to support TD-LTE was completed. In March, the Beijing TD-LTE demonstration network implemented the TD-LTE / TD-SCDMA interoperability application for the first time. On May 17, a number distribution experience was conducted, and more than 300 friendly users experienced services including telepresence systems (conferencing systems), high-definition video surveillance, instant video transmission, and high-definition video on demand (VOD). In mid-2012, China launched the TD-LTE scale-up test. The test cities currently include Hangzhou, Shenzhen, Guangzhou, Shenyang, Xiamen, Qingdao, Tianjin, Nanjing, Shanghai, Beijing, Ningbo, Fuzhou, Chengdu, Wenzhou and Wuxi.15 Cities. Among them, Hangzhou, Guangzhou and Shenzhen use the F (1.9GHz) frequency band outdoors, other cities use the D (2.6GHz) frequency band outdoors, and the indoors mainly use the E (2.3GHz) frequency band, which realizes interconnection, interoperability and multiple operations with the TD-SCDMA network Terminal application business. In September, the GSM / TD-LTE co-site sharing antenna scale network solution in Qingdao was verified. At present, China Mobile has nearly 300,000 TD-SCDMA base stations, and the number of GSM base stations is more than double that of the former, which is a huge advantage of China Mobile over its competitors. At the GTI summit in Pakistan, the industry showed a co-site upgrade plan for the smooth evolution of GSM to TD-LTE.
Wired Headphone including kids headphones /Music Headphones/Basic Wired Headphones/Studio Headphones
Materials: with rubbish finish and silk printing
Use for kids education/fashion show/pc /tablet
Wired Headphones,Wired Headphone With Mic,Kids Headphones For Ipad,In Ear Headphones Shenzhen Greater Industry Co., Ltd. , https://www.szgreater.net
1. Frequency Range: 20Hz - 20KHz
2. Impedance: 32 Ohm
3. Sensitivity: 108dB+/-5dB(93db)
4. Speaker: 40MM
5. Plug Type: 3.5mm Stereo
6. Length of Cable: About 1.2m -1.5m