Wireless 802.11n 2.4g and 5.0g performance tests

Preface

In terms of transmission rate, 802.11n can increase the WLAN transmission rate from 54 Mbps currently provided by 802.11a and 802.11g to 600 Mbps or even up to Mbps. The mimo ofdm technology, which is applied in combination with MIMO (multi-input and multi-output) and OFDM (Orthogonal Frequency Division Multiplexing) technology, improves the quality of wireless transmission and greatly improves the transmission rate.

The existing 802.11n Wireless AP/routing devices are mainly M and M products. These two products are highly practical and cost-effective. According to the 802.11n scheme, a single antenna product can only be a m product. Only dual/three antennas or more can achieve a higher speed.

The existing 802.11n wireless NICs are mainly 150 m (mobile phones), 300 m (mainstream laptops), and 450 m (Apple laptops ).
The usage frequency is 2.4 GB (supported by all devices) and 5 GB (a small number of mobile phones and most Apple devices ).
Although the nominal data of 802.11n is large and the maximum theoretical value reaches 600 m, it is not possible to reach this speed due to channel pollution, various types of interference and blocking.

Due to the popularity of Apple devices, 5G wireless network cards are installed in the latest MBP/MBA/iPad, so 5G users are also quite impressive. At the same time, in newer Windows laptops, dual-band wireless network adapters are also increasingly used.

This test mainly verifies the specific performance of wireless transmission under 2G and 5g. The output conclusions serve as a reference for the future use of wireless devices.
In this test, four devices are used:

PC	Dell e6400
PC	MBP a1278
Wireless Router	Ea4500
Wireless USB Nic	D-Link DWA-160 Xtreme n Dual Band USB adapter (rev. B2)

Cisco's ea4500 is a 450 m + 450 m, dual-band (2.4g + 5g) wireless routing product with 5 Gigabit wired ports, it is currently Cisco's highest-end wireless routing product. It is equipped with six built-in antennas, of which 3 are used for 2G and 5g respectively. The biggest feature is that there is no China Bank, the warranty is only one year, and cannot be implemented in China, no invoice .....

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This figure clearly shows the differences in the Cisco Linksys product line. The following three types of support for Cisco connect cloud (the interface is very fancy [There are few more functions], and specific firmware needs to be refreshed. In the case of poor Internet speed and poor machine configuration, the operation is very uncomfortable. This feature is a very unpleasant feature, so it is discarded .)

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The function is basically described above, with a USB port that supports dlna for video and audio servers.

The test environment is based on two mainstream laptops, Dell's e6400 and Apple's 13-inch MBP a1278. The e6400 uses an external USB wireless network card: dlink dual-band dwa160 wireless network card, and the BNS uses its own ipvm broadcasted dual-band wireless network card. Both laptops are Gigabit wired NICs. The specific configurations of the two devices are as follows. This apple is complacent with a gb ssd, and the price is quite pleasant. It is essential to install B in silk.

Model	Dell e6400	Apple MBP a1278
CPU	Mobile dualcore Intel Core 2 Duo t9600, 1600 MHz (6x267)	Dualcore Intel core i7 2620 M, 3400 MHz (34x100)
Memory	4G DDR2-800	4G DDR3-1333
Wired Nic	Intel (r) 82567lm gigabit network connection	Broadcom netxtremebcm57765 Gigabit Ethernet
Graphics card	NVIDIA Quadro NVS 160 m (256 MB)	Intel (r) HD graphics family (1854840 KB)
Wireless Network Card	D-Link DWA-160 Xtreme n Dual Band USB adapter (rev. B2)	Broadcom bcm4331 802.11n wireless network adapter
Hard Disk	Hitachi hts725032a9a450ata device (298 GB, IDE)	Apple SSD ts512c ata device (465 GB, IDE)

The test convention is to use ixchariot5.4, and use the high_performance_throughput.scr script, respectively:
Wired → wired; wired → 2.4g; wired → 5g; 2.4g → 5g test. Because the purpose is only to test the trend of 2G and 5g transmission speed, and not to test the signal strength, no tests are conducted for multiple points. Considering the theory of fast attenuation of high-frequency signals, 5g signals passing through the wall are also known in advance. In particular, the latest release of 802.11ac has even worse wall penetration performance, but the speed is faster. It can be said that in terms of speed and wall penetration, the user can only choose one of the most suitable ones.
Because the test software ixchariot requires Windows XP, and the Windows XP system cannot be installed on the MBP, a clean windows xp system is installed on the MBP using VMWare Fusion and a test platform is deployed.

Software

Ixchariot

Supporting endpint

Test Environment	IP	Nic
E6400 real machine (XP)	172.16.200.120	1g (wired)
Apple Virtual Machine (XP)	172.16.200.149	450 m (2.4/5G), 1g (wired)
Ea4500 (Wireless Routing	172.16.200.1	450 m + 450 m + 5*1g
DWA-160 (Wireless Network Card)	172.16.200.115	300 m (2.4/5G ),
	Version
	5.4
	6.3

Test wired → wired first use a network cable to connect two laptops to ea4500 for a performance test to verify whether there is a bottleneck in the transmission between the VM and the real machine.
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After enabling 10 threads, we can see that the average final transmission result is 900 MB. Although the maximum transmission value is lower than that of the 1g Nic, it can be seen that the virtual machine has a certain performance loss. However, this value is far greater than the theoretical maximum value of the wireless network card and does not affect subsequent tests.
Wired → 5g

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Enable 20 threads and connect 5g with the e6400 Gigabit Nic using the MBP. We can see that the average final transfer result is 234 m, which is a good value.
Wired → 5g-2
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Enable 14 threads and use the DWA-160 5G band on the e6400 to communicate with the gigabit network card of MBP, the average value is 140 m, because the maximum speed of this network card is 300 m, less than the 450 m, the speed is slower than expected.
Wired → 2.4 GB
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Enable one thread, and connect the BNS with the Dell e6400e dwa160 2.4g band. Average: 67.62 M. We can find that the speed difference between 2G 4G and 5G is great.
2.4g → 5g
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The 2.4g band of MBP is interconnected with the Dell e6400 dwa160 5G band, with an average of 38 M. Because both clients are wireless, the total bandwidth of shared upload and download is based on the features of wireless, the test results are only half (Wireless> WIRED), which is normal. (In fact, there are too many wireless networks in the office area, which is very weak .)

Summary 802.11n has limited bandwidth in a certain range due to its technology. There are many 2G 4G devices, and most of them use the 2G technology for most wireless mouse. In a certain range, the more devices, the better. Many devices share bandwidth. There will also be interference between the device and the device. The intuitive manifestation is that interference will cause a decrease in the data transmission rate.
In this test, there is only one 5G device, and we can find that the wireless transmission speed is far higher than that of a MB wired network card in a close distance (directly visible. In the case of low interference, the limit of GB can be exceeded.
Due to the characteristics of 5g, the transmission speed is high, but the penetration is poor, it determines the performance of the wall penetration is weak. 5G signal strength is weaker than 2.4g at the same position. However, when the connection is normal, the transmission speed is higher than 2.4 GB.


In this test, due to the large number of 2.4g wireless routers in and around the company, the interference is high. The M wireless route transmission peak of 2.4g should be around M, however, the actual test is less than 70 m.

5G NICs are found to have compatibility problems during the test. The supported BNS in some frequencies are not supported by dwa160, and those supported by dwa160 are not. There is another serious problem. When using 5g to connect to ea4500, the Network may fail to be connected after a network disconnection. In the end, only the route is restarted.

In general, the dual-band Wireless AP/route is quite meaningful. Most of Apple's existing devices can match it perfectly, and its transmission speed is much higher than that of 2.4g. Note that you must test the compatibility of the network card and check whether the 5g running status is stable in advance. Considering that the price of dual-band wireless network card (USB) is not friendly, we do not recommend that you purchase a USB wireless network card separately. When there are many users using 5G, we recommend that you use 5g routers/AP in one step. Most enterprise-level APS now support dual-band and are worth buying.

In short, 5g under 802.11n does not bring a qualitative leap to the network, but it is always better than it is. In the case of hardware matching, there are not many obstacles in the office area, the 5g speed is really different. End this article with the Windows 7 Ad. "It's really different !"

This article from the "seconds to fight for Youth" blog, please be sure to keep this source http://8599721.blog.51cto.com/8589721/1531687