â— 4G creates "a huge wireless ecosystem"
Scott Schneider, in his recently published book "The New World of Wireless: How to Compete in the 4G Revolution," said that when consumers just felt that they had figured out 3G wireless gadgets, they came again. It is time to master the fourth-generation wireless technology. What is 4G? He explained that the fourth-generation wireless technology will be faster and more impactful than all wireless technologies we have experienced before. Schneider predicts that 4G will completely change our working methods and entertainment methods. It will create "a huge wireless ecosystem" and "a ecosystem of innovations one after another."
Schneider further explained the "big wireless ecosystem" of 4G in an interview. 4G includes several aspects. First, it is much faster. The second major change is that new wireless technologies are more like "clouds," which means that many devices can be interconnected through different types of networks. The third major change is that things that are still happening behind the scenes will one day become very apparent. That is the connection between the items and the equipment, that is, the concept of the Internet of Things that we propose.
â— China 4G is not far away Although the application of 3G in China is only a matter of recent years, the real life of 4G expatriates is no longer far away. On July 1, the relevant experts of China Mobile participating in the TD-LTE test disclosed that the current TD-LTE scale trial network conducted by China Mobile has completed the network supporting work in the province, and the first batch of system equipment manufacturers that have entered the market have completed the core The test of the network is carrying out the next phase of wireless network testing. By the end of December of this year, all vendor testing will be completed.
At the end of 2010, the Ministry of Industry and Information Technology approved the approval of China Mobile to undertake the "TD-LTE scale trial network" construction project. “2011 will be the first year of TD-LTE commercialization, and 26 TD-LTE trial networks will be established worldwide.†Wang Jianzhou, chairman of China Mobile, has repeatedly appealed for the acceleration of TD-LTE deployment.
It is reported that China's TD-LTE is also 3.9G. Professor Zeng Jianqiu of Beijing University of Posts and Telecommunications pointed out that technically speaking, this is not 4G, but 3.9G. The theoretical data transmission speed is higher than the current 3G standard and is also referred to as quasi 4G. It has application in Shanghai World Expo and Guangzhou Asian Games. After the completion of TD-LTE, it does not mean that the previous 3G and 2G networks are no longer needed. TD-SCDMA can be smoothly upgraded to TD-LTE, and some of them can even rely on software upgrades. "An important sign of the 4G era is that the speed will be at least 10 times the 3G rate, and the bandwidth will be wider." Zeng Jianqiu predicted that the real 4G era will come several years after its development.
â— The 4G era peaks and turns?
Whoever has the leading communication technology can control the future. Can China become a leader one day? According to GSA data, as of April this year, the number of operators worldwide announced the deployment of LTE has reached 196. As one of the versions of LTE technology, LTE TDD technology is increasingly being favored by operators as a global solution for asymmetric spectrum. Statistics show that at present, 18 operators or government agencies in the world have conducted experiments or demonstrations of LTE TDD, and China Mobile is the main driving force for this strong growth momentum.
The market research institute In-Stat recently released the latest research report. Its wireless communications analyst Chris Kissel said that currently the US LET4G operator's investment and efforts in this technology are continuous and large-scale, so the leading advantages in global mobile communications technology will be replaced, Asian wireless operators' The technological advantage will return to the North American market. It is expected that the US LTE4G investment will account for more than 25% of the global market, and its user growth will exceed the sum of Europe and Asia.
The fourth-generation mobile communications long-term evolution technology LTE4G technology has a good momentum of development in the world. LTE4G, as an important mobile broadband technology, will be the most important wireless technology standard in the future. It is expected that the number of global LTE4G users will reach by 2014. It will exceed 150 million.
4GLTE is far from universal, but new news has been reported from Sweden. Ericsson has developed 5G technology equipment that is 10 times faster than LTE, 3GPP Release10. Experts predict that this is a very young technology and should not be out of the laboratory until 2013. Text / reporter Cao Fang â— link â—
â— What is 4G?
4G is the abbreviation of the fourth generation of mobile communication and its technology. It is a technology product that integrates 3G and WLAN and can transmit high-quality video images, and the quality of image transmission is comparable to that of high-definition television. The 4G system is capable of downloading at 100 Mbps, 2,000 times faster than dial-up Internet access, and uploading at speeds up to 20 Mbps, and can satisfy almost any user's requirements for wireless services. In terms of prices most concerned by users, 4G and fixed broadband networks are comparable in terms of price, and billing methods are more flexible and mobile. Users can determine the required services according to their own needs. In addition, 4G can be deployed in areas not covered by DSL and cable modems, and then extended to the entire region.
About high speed Door Accessories:
1.Driving system: High Speed Door Servo System motor and control, motor SNMA / SEJ +reducer+flang+encoder+control box
2.Other accessories: Middle aluminium bar, bottom aluminium bar, aluminium vertical track, stainless steel vertical track, brushes,round nylon strip, PVC roll, rolling steel tube complete, drum be;;s for rolling tube, side end covers, stainless steel cover, steel tubes, air bag sensor system, safety light beam, Microwave sensor 24 Gigahertz,PVC welding machine, smoke and fire sensors, PVC transparent window, magnetic loop, photocell, remote control, manual push button, sound warning alarm Led lamp traffic light
For some main accessories, here is detain introduction:
1).24G radar sensor:
Brand: Hofic
Technology: Microwave processor
Maintain time: 0.5s
Protection: IP54
Transmitting frequency: 24.125GHz
Maximum installation height: <5meter
Transmitting power density: <5mw/cm2
Power consumption: <1W(VA)
Installation angle: 0-90°(lengthways) -30-30°(crosswise)
Supply voltage: AC&DC 12V-30V
2).Photocell:
Approval CE & ISO9001
Power supply AC/DC 12-30V
Static current 25A
Action current 40mA
Mounting distance Max 10m
NO or NC contact Done by NO./NC. contact selection
Working environment temperature -42℃ to +45℃
Working environment humidity 10 to 90%RH
Appearance dimensions( controller) 123*50*32mm(L*W*H)
Appearance dimensions(Magic eye head) 19*13mm(L*D)
3). Remote control
Operating Voltage: AC220V/50HZ+-20%
Transmit power:≤100mW;Super regenerative module, strong anti-interference
Operating temperature:-30℃-+70℃
Working frequency: 433MHZ;transmitter 1527, millions of encoding chip
Accept sensitivity:≤110dB
Manipulation method: electric remote control
Configure the quantity: Wireless number; factory configuration transmitter two. Can be equipped with PT2272 digital decoder chip
Configure the function: Up, down, stop, anti-lock full-featured reproduction
4). Magnetic loop
Voltage: 12V AC/DC +-10% 24V 115V AC+-10% 230V
Power: <2VA
Continued electrical output: 7A / 250V AC
Frequency range: 20 to 200K Hz
Response time: infinity (factory setting) or adjust maintain time
Sensitivity: 0.01% to 0.1% divided into 3 levels
Protection level: IP30
Electromagnetic compatibility (EMC) Complies with EM50081-1 and EN50082-2
Detection loop inductance: the limit of 40uH to 100uH ideal value 80uH to 300uH
Operating temperature: -25 ℃ to 70 ℃
Storage temperature: -40 ℃ to 85 ℃
Relative humidity: <90% non-condensing
Temperature compensation: automatic compensation up to 50 ℃ / h
Connection type: 11 pin DIN rail socket
Dimensions: 41 * 78 * 85 mm (width * height * length)
Weight: 250 grams
5). manual push button
This exit switch button is made of ABS and has built-in indicator light make it looks more elegant and fashionbale. It can be widely used in public entrance gates, public door, home, office, hotel, etc.
Door Exit Button Push To Exit Switch Door Opener For Access Control Security
Main Feature
Fashionable appearance
Made of ABS Plastic
Easy to install and operate
Used for access control
Specification
Mechanical Life: 500,000 test
Material: Plastic
6). Limit switch encoder
Voltage: DC5V-24V
Output voltage: high voltage≥85%Vcc, low voltage≤0.5V
Maximum mechanical speed:6000rpm
Anti-vibration: 50m/s,10-200HZ,XYZeach way 2 times.
Current consumption:≤30mA
Response frequency: 0-100KHZ
Protection: waterproof,oil proof,dust prevention, IP54
The output code system: binary code
Operating life: MTBF≥30000(+25℃,2000rpm)
Rotational inertia:4.0x10-8kgm²
Maximum load:radial direction20N
Axial direction:10N
Weight: about 0.4kg
High Speed Door Accessories,High Speed Door,Electronic High Speed Door Accessories
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.selfrepairinghighspeeddoor.com