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After investigating the environment, how can we accurately, scientifically and quickly predict the approximate wireless AP demand?
According to this problem, today we will understand the factors affecting the number of wireless AP placement and the method of calculating the number of wireless AP bandwidth factors affecting the number of wireless AP placement:
1. Network bandwidth
Usually when discussing the bandwidth of a link, it refers to the number of bits that can be transmitted per second on the link, emphasizing the rate that can be achieved. For example, the bandwidth of 100 gigabit Ethernet is 100 MBPS, and the bandwidth of Gigabit Ethernet is 1000 MBPS.
2. Throughput
Throughput and bandwidth are confusing terms. When discussing the bandwidth of the communication link, it generally refers to the number of bits that can be transmitted per second on the link, which depends on the link clock rate and channel coding in the computer network, also known as the line speed, which can be said that the bandwidth of 100 megabit Ethernet is 100 MBPS. The difference between bandwidth and throughput: Bandwidth emphasizes the speed that can be achieved, while throughput emphasizes the actual speed. Because the reality is affected by various inefficiency factors, it is usually more inclined to use "throughput" to express the performance of the network.
3. Coverage
In a non-high-density scenario, you can determine the number of wireless aps based on the actual scenario area and recommended coverage range. In some cases, the coverage distance can also be calculated, and the coverage range can be adjusted appropriately according to the power.
4. Access number
In a high-density area, you must also consider the number of wireless aps to be accessed. The recommended number of wireless aps varies according to the number of concurrent access users (notebook and mobile phones are different).
Bandwidth Indicates the number of wireless aps
Many users have such a question: this scenario this solution deploys so many aps, the bandwidth support is not supported? If it is not supported, then the user's Internet speed has become turtle speed? Or how much egress bandwidth does the deployed AP need?
① The egress bandwidth can be obtained based on the number of aps, the number of concurrent users, and the bandwidth allocated by each user. WLAN capacity bandwidth = Number of concurrent users x bandwidth per user.
(2) The number of concurrent users can be estimated by 50% to 70% based on the number of users in the coverage scenario.
In order to make each wireless terminal have enough bandwidth to use, it is generally recommended that a wireless AP access 10 to 15 wireless.
④ Number of aps = concurrent users ÷15(the number of users accommodated by a single AP, this value can also be adjusted according to the number of users accommodated by AP).
The bandwidth allocated by each user can generally be set to an intermediate value for calculation estimation, such as 100kbps. (Common unit conversion: 1TB=1024GB, 1G=1024MB, 1MB=1024KB, 1KB=1024B, 1 byte =8 bits.)
Here's an example:
A university has 30,000 campus users and 15,000 mobile terminal users. The concurrency ratio is 50% to 70%. The bandwidth of each user is 512Kbps.
Answer:
1, concurrent access =15000x(50%~70%)=7500~10500 people;
2. Number of aps = Number of concurrent users ÷15=(7500~10500)÷15=500~700;
3. WLAN capacity requirement =(7500~10500) x 0.512=(3840~5376)M.
And finally:
AP demand will change according to the application environment, AP performance, bandwidth and other changes, so master the calculation formula, in the actual application should also be flexible according to the actual situation.
