Wireless Network Transmission speed Comparison and Analysis Report

Wireless Network Transmission speed Comparison and Analysis Report

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Blog: http://hichuann.blog.51cto.com/1024435/1584578

When purchasing a wireless router, which parameter is your most important? I believe that the answer from most users is wireless transmission rate.

Yes, this figure often appears in the prominent position of the product outer packing, has long been the most important parameter of the wireless router.

However, you can understand that this number is only a theoretical value, which is much less efficient than the actual transmission rate of wireless routing. What is the water content of the most important parameter? Let's discuss it together.

This is a version in PPT format. Recently, the boss of the Department complained that the wireless network speed was slow. Therefore, he made this PPT to explain to him.

This is the current mainstream wireless standard and its maximum transmission speed. The mainstream Mbps desktop is connected to the wired network, and the conversion is followed by the data.

We have already discovered that the two speed standards of 802.11n both exceed Mbps of wired network, so which is faster?

With questions, let's break down them one by one.

The following data is taken from the Internet and tested in a single Pair and encrypted environment.

First, let's take a look at the performance of 802.11b.

The theoretical maximum speed of 802.11b is 11 Mbps, that is, 1.375 MB/s.

During the actual test, the transmission speed of most 802.11b networks is between 4-5 Mbps, that is, 512K-640KB/s. Water reaches 60%, and this speed does not meet our requirements.

Next, let's take a look at the performance of the 802.11g test, which is the most widely used standard in the past few years.

The theoretical maximum speed of 802.11g is 54 Mbps, that is, 6.75 MB/s.

During the actual test, the transmission speed of most 802.11g networks is between 18-24 Mbps, I .e. 2.25-3 MB/s. Water reached 60%

Now our company uses 802.11 GB, that is, 2.25-3 Mb/s, which is obviously slower than m wired network.

Therefore, it seems that when the wireless network standard is switched from 802.11b to 802.11g, this is only an upgrade, and the effect is not surprising.

Nowadays, both 802.11b and 802.11g are outdated. Currently, the mainstream is 802.11n. What is the performance of 802.11n?

Let's take a look at the 150 m 802.11n. The theoretical maximum speed is 18.75 Mbps, that is, MB/s. What about the performance during the actual test? I think all of you are using 802.11n at home. Based on your experience, how much do you think can be achieved?

During the actual measurement, the speed of most 5.625 M network devices is between 45-55 Mbps, that is, 6.875-66% MB/s. Compared with the theoretical maximum speed, the water score is as high.

I think everyone is not satisfied with this speed. Let's take a look at the last one.

The maximum theoretical speed of 300 M 802.11n is 37.5 Mbps, that is, MB/s, which is three times the speed of M wired network.

In the actual test, the average speed is only 60-80 Mbps, that is, 7.5-10 MB/s, and the water score is as high as 78%. This result is somewhat disappointing. My friends are stunned!

Of course, encryption will affect part of the speed. If you want to speed up, you can run it bare, but we do not recommend that you do this, and we will not.

From this point of view, China Telecom's M bandwidth is actually a waste. Wireless routers are a bottleneck and will be better in the 802.11ac environment, but this M bandwidth may also be a waste.

Some new home 802.11n products can reach-105mbps in a single Pair and unencrypted environment.

Finally, we are most familiar with 100 m wired networks. There is no doubt that the theoretical maximum is 12.5 Mbps, that is, MB/s.

The average test speed can reach 89 Mbps, that is, 11.125 MB/s, and the water value is only 11%. The performance is still very good.

Through the analysis of the previous test data, everyone knows who is going to slow down.

In terms of actual speed, M wired network still occupies some advantage.

More importantly, a m wired network is an exchange network, with M bandwidth exclusive between two nodes, but a wireless network is a shared network, the actual speed is reduced by the increase of client data connected to the AP.

Why is the water in wireless networks so high?

I think there are five points:

1. the wireless network uses half-duplex transmission, which is cut down by 50%. Time division multiplexing

2. complex environments, wall and metal interference, and GHz band congestion will affect the transmission speed.

3. The factor affecting the speed is the transmission distance. You don't want to reach the theoretical maximum connection speed 50 meters away.

4. The impact of wireless encryption is the fastest, but it is not recommended.

5. the compatibility of devices from different vendors is the same standard. devices of the past few years can only reach 80 Mbps, and the devices produced may now reach 100 Mbps.

Is there a huge gap between the actual wireless transmission rate and the theoretical transmission rate?

Of course, the answer is yes. After all, this is a disadvantage compared with the advantages of wired networks.

Although the theoretical transmission speed of the wireless network is very high, we can see that the gap between the wireless network and the wired network is narrowing down. Currently, the M wireless route can provide the actual wireless transmission rate over 60 Mbps, compared with the performance of a wired network of 90 Mbps, the gap is not obvious. Even if you watch HD videos over a wireless network, it can be competent. With the release of wireless products with Mbps, the actual rate of the wireless network will reach 130 Mbps.

There are also updated 802.11ac standards.