What is the capacity of a wireless AP? If we understand his capacity, we have to understand the performance indicators of ap.
When doing a wireless coverage project, you need to select the wireless AP according to the networking needs and application scenarios. The number of wireless APs is an important reference factor. However, under normal circumstances, a single AP may not be able to achieve the amount of belt claimed by the merchant, because there are many factors affecting the amount of wireless AP belt, such as the size of the broadband, the number of access devices, chips, memory, etc. The factor of the AP's capacity is all related to the working principle of the wireless AP.
What factors to consider when choosing an AP?
When selecting an AP for wireless coverage, consider the following:
Environmental characteristics: Outdoor or indoor, sparsely distributed terminals (such as warehouses) or high-density wireless access (such as conference rooms, multifunctional halls, etc.).
Installation: ceiling, panel or 86 box type.
Power supply: Standard PoE (802.3af or 802.3at), Passive PoE or DC (DC power supply).
Coverage: single room, multiple rooms, area coverage, fixed-point coverage, etc.
Frequency: 2.4g and 5.g, single frequency and dual frequency.
Band capacity: A single AP accesses 10, 20, 30 or 50 terminals.
The number of wireless APs on the market is different from different manufacturers, ranging from 25, 50, 100, and 200. Is it really that high?
In fact, there is no standard answer on how many end users a wireless AP can connect to, because the network application situation of each use scenario is ever-changing, and the terminal equipment used is different, and it is difficult to achieve a certain standard test method. Therefore, many manufacturers use a typical application environment to estimate the amount of tape.
Therefore, in order to ensure that the communication speed of the entire wireless network is not affected, a single AP needs to control the number of wireless terminal accesses, that is, the amount of tape we often say, so as to ensure that each terminal can obtain sufficient Internet bandwidth. .
As for the impact of the hardware configuration of the wireless AP on its capacity, it mainly refers to the two aspects of chip and memory size. The better the chip, the greater the throughput; memory is also a factor that affects the amount of tape.
1. Dual frequency and single frequency:
Now the market is saying that dual-band APs support 2.4G and 5G APs. In our general practical experience, the number of single-band APs is basically difficult to exceed 40. The dual-band capacity is much higher. The performance of a 5.8G dual-band AP may reach twice that of a single frequency. Therefore, if it is a high-density access site, it is strongly recommended to use a dual-band AP.
2. The difference between the frequency range of 2.4g and 5g (why use dual frequency):
The 2.4G frequency is widely used and is supported by almost all computers and smart phone devices. But because it is too common, even microwave ovens use the 2.4G frequency band, so the interference is large, and serious interference will cause the data transmission rate to slow.
And 5G Wi-Fi is born to avoid the problem of mutual interference, because currently this frequency is used less. Generally, 5G-enabled wireless APs based on 802.11ac technology can carry higher transmission rates. 5G also has disadvantages. The problem is that the ability to penetrate walls is poor. After 5G signals are separated by a load-bearing wall, the signal attenuation is very obvious.
and so:
The lower the frequency, the better the wall penetration. The higher the frequency, the faster the speed. At present, there are more people using 2.4G. In addition, the CMCC WIFI signal has serious interference! 5G is currently not used much and there is almost no interference, so dual-frequency APs can be used in both frequencies at the same time.
What is 802.11 a / b / g / n / ac?
First, 802.11 is a wireless LAN standard. 802.11 a / b / g / n / ac are all developed from 802.11. Different suffixes represent different standard working frequency bands and different transmission rates of the physical layer, which means that their physical layer and transmission speed are different.
802.11b and 802.11g work on the same frequency band, and g is compatible with b, which means that the network cards that support g can support b.
The 802.11n protocol is a dual-frequency working mode (including two working frequency bands of 2.4GHz and 5GHz). In this way, 11n guarantees compatibility with the previous 802.11ab, g standards, that is, we need to see whether there are 802.11n parameters when selecting an AP.
The new generation wifi standard 802.11 ac is developed from 802.11 n and has a higher speed than 802.11 n. Now the market is saying that dual-band APs and routers support both 2.4G and 5G frequencies.
Wireless rate
Although the wireless speeds of many APs are 450Mbps, 600Mbps, 750Mbps, and 1167Mbps, these are actually not achieved. See the list below for details.
The actual rate is about half of the theoretical rate. We can basically calculate the amount of tape through this table. Currently, the main 802.11n standard AP is used. The actual rate is 80Mbps-360Mbps. You can estimate his bandwidth based on Carry capacity, basically the upper limit is about 100, and the new generation wifi standard 802.11 ac rate is higher, the machine capacity will be higher. Of course, how much depends on factors such as the chip, memory, and environment of the AP.
Finally, let ’s talk about the amount of wireless routers and wireless APs. Home wireless routers have a limit of 8 to 15 terminals. Generally, wireless APs can bring about 20-60 terminals. Remind friends, do not use home routers to do wifi project coverage in order to save money.
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Heat Treatment: Normalizing
Quenching
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