Since most 802.11n devices are designed for the 2.4 GHz band, 2.4 GHz itself has fewer available channels, and there are other devices operating in the 2.4 GHz band (such as Bluetooth, microwave ovens, wireless surveillance cameras, etc.), even in the dual The connection rate of the spatial stream can reach 300 Mbps in the 40 Mhz bandwidth. However, in actual network environments, due to mutual channel conflicts and the like, the actual throughput is not high and the user experience is poor. Designed specifically for the 5GHz band, 802.11ac features a unique new RF feature that increases the performance of existing WLANs to the level of comparable to wired Gigabit networks.
As a new standard for IEEE wireless technology, 802.11ac draws on the advantages of 802.11n and further optimizes it. In addition to the most obvious high-throughput features, 802.11ac is not only compatible with 802.11a/n devices, but also improves User experience.
In an 802.11ac network, each wireless access point can accommodate more clients, providing more bandwidth for each parallel traffic stream, while having the advantage of lower latency and more power savings.
802.11ac, commonly known as 5G WiFi, is an 802.11 wireless local area network (WLAN) communication standard that communicates over the 5 GHz band (also known for its name). In theory, it can provide at least 1 Gbps of bandwidth for multi-drop wireless LAN communication, or a single connection transmission bandwidth of at least 500 Mbps.
Working frequency band: 5GHz
Working bandwidth: 20MHz, 40MHz, 80MHz, 160MHz
Transmission rate: 867Mbps@20MHz, 1.73Gbps@40MHz, 3.47Gbps@80MHz, 6.93Gbps@160MHz
Key technologies: QAM256 modulation, MU-MIMO (up to 8 streams)
Transmission distance: 30 meters (when the maximum transmission rate)
802.11ac is the successor to 802.11n. It adopts and extends the concept of air interface derived from 802.11n, including: wider RF bandwidth (up to 160MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and high-density demodulation (modulaTIon) (up to 256QAM).
802.11ac works in the 5.0GHz band to ensure backward compatibility, but the data transmission channel will be greatly expanded, increasing to 40MHz or 80MHz based on the current 20MHz, and may even reach 160MHz. Coupled with an increase of about 10% of the actual frequency modulation efficiency, the theoretical transmission speed of the new standard is expected to reach 1Gbps, which is more than three times that of 802.11n 300Mbps.
From the core technology point of view, 802.11ac is built on top of the 802.11n standard, including the 5GHz band that will use 802.11n.
However, in the channel setting, 802.11ac will use 802.11n MIMO (Multiple Input Multiple Output) technology to lay the foundation for its transmission rate up to Gbps. The target of the first phase is to achieve a transmission rate of 1 Gbps. The transmission rate of the cable.
The operating bandwidth of each channel of 802.11ac will be increased from 80MHz of 802.11n to 80MHz or even 160MHz. Together with about 10% of the actual frequency modulation efficiency, the final theoretical transmission speed will jump from 802.11n's highest 600Mbps to 1Gbps. Of course, the actual transmission rate may be between 300 Mbps and 400 Mbps, which is close to the current 802.11n actual transmission rate (currently the actual transmission rate of 802.11n wireless routers is between 75 Mbps and 150 Mbps), which is sufficient for simultaneous transmission on one channel. The road compresses the video stream.
In addition, 802.11ac will be backward compatible with all existing and upcoming standards and specifications of the 802.11 full range, including the upcoming 802.11s wireless mesh architecture and 802.11u. In terms of security, it will fully comply with all the content of the 802.11i security standard, enabling wireless connectivity to meet the needs of enterprise users in terms of security. According to the implementation goal of 802.11ac, 802.11ac will help enterprises or homes to seamlessly roam in the future, and support the security, management and diagnostic applications of wireless products during the roaming process.
802.11ac offers the following technologies to increase network bandwidth and a better user experience:
1. Support wider bandwidth (RF Bandwidth): up to 160 MHz (802.11n upper limit is 40 MHz)
2, support up to 8 spatial streams (MIMO SpaTIal Streams) (802.11n only supports 4)
3. Multi-user MIMO (MulTI-user MIMO) (802.11n does not have this function)
4. Beamforming is formally formed (802.11n non-standard function)
5. Support high-density demodulation (Modulation): 256 QAM (802.11n up to 64-QAM)
1. Non-disruptive scalability. In most settings, 802.11ac installations will cover 802.11n or older infrastructure. Importantly, 802.11ac APs require transparent support, perhaps initially in backward compatibility with 802.11n mode, and even as a sensor to detect unauthorized 802.11n activity. These new APs can be converted to configuration access later.
2. Dual Gigabit Ethernet ports: Dual radios are common in today's APs, and two 802.11ac radios may flood a single port. Two GbE ports should be considered for deployment on any dual radio AP. Of course, 1.3 Gbps throughput is unlikely to flood the Gigabit Ethernet (GbE) switch ports because the actual throughput may not exceed half of the peak. Please note: Suppliers usually mention the maximum possible speed, which is unlikely to be a problem with given radio frequency propagation and other wireless transmissions.
3. Support intensive deployment. The wider channels of the 802.11ac access points (2.4 and 5 GHz bands) and better radio modulation, coupled with increasing capacity requirements, mean that we may need more APs. Given the inherent complexity here, control functions should be able to self-configure APs, make critical decisions about wireless channel and transmit power allocation, and automatically meet other operational parameters.
4. Enhanced management functions. The overall management function may be the main difference between performance and value. To do this, you need to think carefully about how these innovations not only improve throughput and reliability, but also improve IT management efficiency and total cost of ownership.
The advantages of 802.11acAlthough the speed of AC has reached "Gbps level", in the future version, the transmission speed may reach 7Gbps, which is a huge leap for 802.11n.
Compared to the previous version, each AC access point can handle more users, so the network can handle more devices.
The 802.11ac specification uses a wider channel. Although the AC access point will use 20, 40, and 80 Mhz channels in the initial release, the access point may use a 160 Mhz channel in a future release.
Since 802.11ac only works in the 5 Ghz band, networks using this specification will hardly collide with other devices.
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