5 things to know about WiFi 802.11ac

Source: Internet
Author: User
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1 802.11ac can't give you a gigabit level (gigabit) throughput

Although the WiFi consortium announces that it can theoretically achieve the throughput of 1.3 Gbps, it is twice times more than 802.11n. means that the network can simultaneously support the transmission of high-definition quality video streams to multiple devices. In fact, you can't see 802.11AC theoretically 1.3 Gbps throughput unless you're testing a lab rather than your office, and to achieve the highest speed you need to support 3 data streams, each of which reaches 433 Mbps throughput. A typical 802.11AC access point supports up to 8 data streams, but many client devices should support only one.

For example, the built-in (Bo Tong) Broadcom BCM4335 Wi-Fi chip Galaxy S4, chip support only one data flow, you can see up to 433Mbps speed. Unofficial 802.11AC devices have already been shipped, but the official first generation of 802.11AC devices have not been able to achieve which speed, the current cneet/zdnet with Netgear R6300 WiFi router test the highest rate (throughput) is 331Mbps.

2. Scope of work

802.11AC supports the 5GHz band, compared to the previous 2.4 GHz, 5GHz Band can provide more channels in a wider range of space. But the 5GHz signal range may be smaller, which is related to its use of "beamforming" techniques. Previous WiFi is a full range of office equipment coverage, now more emphasis on directly from the access point (AP) to a specific point of the device signal transmission.

There is no specific explanation, but it can be understood that if a 802.11ac router only needs to cover a few devices, such as 8, the signal will be very good. But with a lot of people, you have to get closer to the AP (Access point). Indeed, this is clearly not ideal for WiFi requirements in large conference rooms.

3. Backward compatibility

All 802.11AC products will be backward compatible with 802.11n network equipment (such as a certain notebook), or even 802.11g of old equipment. But 802.11ac is not a panacea, such as you buy a 802.11AC ap with the old equipment, the maximum speed or is limited to the maximum value of the old equipment. Hing Qing now many support 802.11ac of new equipment to come, you can buy a taste of fresh.

4. Channel interference problem

WiFi network Management people know that the 2.4GHz band is very crowded, theoretically you can use 14 channels, but in practice, in order to avoid interference, you may only use 3 or 4 channels, if which channels interfere with each other, the speed will plummet. Now the 802.11AC band has been raised to 5GHz, what is the situation?

The following figure shows that the 802.11ac speed increase is inseparable with the channel frequency. The channel frequency in 802.11AC will increase to 80 to 160MHz, the data rate is significantly increased to 160MHz, in the United States this means that a maximum of 5 channels are allowed.

5.802.11AC needs more equipment to popularize

You must think that the 802.11AC standard brings the Gigabit wireless network will be able to reduce some of the gigabit network for your wiring. But in fact, as I said, 802.11ac doesn't really bring you gigabit speed, so it's not going to replace the gigabit network we have now. Second, many people do not know that the second wave 802.11ac will be dual Gigabit Ethernet port Link aggregation. And until next year, the second wave of 802.11AC AP products will appear in large numbers, so now can not rush to replace the existing 802.11g/n AP products.

In the end, this tells us that gigabit-level WiFi is not so fast, and that it can't be deployed in a large amount of consumer life in 2014, so don't worry.

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