Jay Botelho, director of product marketing for WildPackets, wrote in the US "Online World" that Imagine a world where family members can transfer their favorite high-definition content to different rooms, and your teenage children can transfer his latest high-definition The video "project" is transferred to YouTube. With the new wireless LAN technology based on the 802.11ac standard soon to be launched (probably in one or two years), this paradise of digital home networks may become a reality. 802.11ac utilizes and learns the advanced features provided by 802.11n to provide greater throughput while transmitting high-bandwidth data to multiple users, and has better interoperability in existing commercial wireless devices and nearby wireless LANs Sex. Compared with the 802.11n we currently have, we will see another important leap forward in terms of functionality and overall data transfer. The data rate will increase from a maximum of 600MB per second for 802.11n to 3.47GB per second for 802.11ac, for a total capacity of 6.93GB per second. advantage Wireless LAN equipment manufacturers learn a lot from 802.11n. These experiences are obviously incorporated into 802.11ac. The two key functions of 802.11n, MIMO (multiple input multiple output) and channel bonding, form the basis of 802.11ac's enhanced functions, as well as some more complex optional functions. The first good thing about 802.11ac is that it is specifically designed for the 5GHz band. This band provides greater flexibility for channel bonding, one of the key data rate enhancements. Channel bonding is commonly used in current 802.11n devices. Since most 802.11n devices are designed for the 2.4Ghz band, channel bonding in this band can cause serious interoperability problems. The 5GHz frequency band can provide more channels in a wider space, and is far less sensitive to interference from consumer electronic devices such as baby monitors, wireless surveillance cameras, and microwave ovens. Additional protocol enhancements also specifically make channel bonding unlikely to cause interoperability problems. This includes the device's ability to assess whether adjacent frequency bands are clear and available for channel bonding and to allow the device to reserve a wider bandwidth before data transmission. This allows channel bonding to be increased from 40MHz in 802.11n to 80 to 160MHz in 802.11ac. Making channel bonding less intrusive and allowing wireless devices to use by default is the key to achieving accelerated data rates in 802.11ac. The second benefit of 802.11ac is that despite the significant increase in data rate, the power consumption is reduced compared to the similar capacity of 802.11n. This is a huge victory. 802.11n began to raise the power limit (especially for mobile / portable devices) to a level where most portable devices cannot take advantage of the full advantages of 802.11n. By using a more efficient data encoding mechanism, 802.11ac allows devices to use fewer transmission paths while still being able to achieve higher data rates. It is the additional RF transmission chain that really consumes power. In addition, considering that one of the main applications of 802.11ac is to publish video inside the home, the power problem can be further alleviated because many devices will not be mobile, such as your 52-inch LCD TV. This means that AC power is available. Video transmission is generally unidirectional. This means that the PC or digital video recorder will transmit the video. These devices require more power. TVs or iPads mainly receive high-bandwidth signals. These devices require less power. Finally, 802.11ac introduced an optional feature. One transmitting device can transmit streaming video and other data to multiple receiving devices simultaneously. At present, 802.11 communication is actually point-to-point communication. If the same video stream needs to be sent to three clients, it needs three times the bandwidth. With 802.11ac, bandwidth usage will be more efficient. Bad aspect Like many technological advances, 802.11ac is very complex. This is definitely a very bad thing, especially for the technology of the general consumer market. So far, manufacturers and industry associations such as the Wi-Fi Alliance have done a lot to hide complexity from end users. Therefore, there is still hope here. However, 802.11ac increases the number of settings and selections between the transmitting device and the receiving device. Therefore, it is difficult to set the user's expectations for the function of each device. We just described the power supply as one of the good things. However, power supply is still a challenge in 802.11ac, especially for devices that are high-bandwidth data sources. To achieve the highest available bandwidth in 802.11ac requires up to 8 RD transmission equipment. In contrast, current 802.11n allows up to 4 transport streams, but there are few devices with the capability of 4 transport streams, mainly due to power supply and other RF challenges. It may take a long time to fully implement the 802.11ac function. The number of transmission devices and the power supply that drives these devices are not the only implementation challenges. Beam forming, a feature that 802.11n has not provided so far, is also part of 802.11ac. This is just one example of this complex technology. This technology needs to be implemented to achieve the maximum data rate, because this technology is described in the document, which does not mean that this technology is easy to implement. Disadvantages Therefore, fortunately, this complexity problem that we have not solved so far is only relevant to the manufacturer. However, this is very bad. There is still a great geographical difference in the frequency allocation of the 5GHz frequency band. The frequencies allocated for the main frequency and channel bonding are completely different, resulting in a difference in the availability and number of high-bandwidth channels. This will significantly increase the production complexity of equipment sold worldwide, not to mention the marketing challenges, because the same hardware will have different functions in different geographic locations. Let's let the manufacturer deal with this problem. So, when can 802.11ac devices reach your dock? This is a long time. Although this new standard may be approved within a year or two, manufacturers must resolve some important technical issues before the 802.11ac equipment goes to market. Therefore, if you have just planned to do so, or have recently upgraded to 802.11n, do n’t worry. It is not worth delaying the upgrade to 802.11n and waiting to jump to 802.11ac. Remember, when 802.11n starts knocking on your door, planning a wireless network requires careful consideration. As with 802.11n, designing your own network to meet application needs and purchasing equipment that allows you to take full advantage of your corporate wireless network are essential.
LED Street Lights are made with LED chip, with high
efficiency, safety, energy saving, environmental protection, long life, fast
response, high color rendering index of the unique advantages of urban lighting
energy conservation is of great significance. We can provide 20w-300w different
watts LED Street Lights for sale to meet your needs to meet your needs.AC
85-305V/ DC 12V Input Voltage, LED street lights by Our Comapany offer a long
life span and extreme reliability.
Handheld UV Disinfection light,Hospital grade UV Disinfection Light,Uv light disinfection for house,UV cell phone disinfector box Shenzhen Ri Yue Guang Hua Technology Co., Ltd. , https://www.ledlightinside.com