What is WIFI?

Basic understanding of WIFI

WIFI was originally the abbreviation for wireless fidelity. The full English name of Wi-Fi is wireless fidelity. In the context of wireless local area networks, it refers to “wireless compatibility certification”. It is essentially a commercial certification and also a wireless networking technology. , Used to connect to the computer through a network cable, but now it is connected to the network through radio waves; a common wireless router.

Wi-Fi Internet access can be simply understood as wireless Internet access. Almost all smart phones, tablets and laptops support Wi-Fi Internet access, which is the most widely used wireless network transmission technology today. In fact, the wired network signal is converted into a wireless signal, and the wireless router is used for the reception of related computers, mobile phones, tablets, etc. that support its technology. If the mobile phone has Wi-Fi function, when there is Wi-Fi wireless signal, it can go online without going through the network of China Unicom, saving the data charge.

 

How does Wi-Fi work?

On the technical side, the IEEE 802.11 standard defines the protocols that enable communications with current Wi-Fi-enabled wireless devices, including wireless routers and wireless access points. Wireless access points support different IEEE standards.

Each standard is an amendment that was ratified over time. The standards operate on varying frequencies, deliver different bandwidth, and support different numbers of channels.

 

802.11Standard rate and frequency band development history

802.11Standard rate and frequency band development history

WiFi

Name

Speed

frequency

WiFi 1

802.11b

11 Mbps

2.4 GHz

WiFi 2

802.11a

54 Mbps

5 GHz

WiFi 3

802.11g

54 Mbps

2.4 GHz

WiFi 4

802.11n

Number of antenna receiving and sending:

1*1 Highest rate144Mbps

2*2 Highest rate 300Mbps

3*3 Highest rate 450Mbps

4*4 Highest rate 600Mbps

2.4 GHz

WiFi 5

802.11ac

Number of antenna receiving and sending:

1*1 Highest rate 433Mbps

2*2 Highest rate 866Mbps

3*3 Highest rate 1300Mbps

4*4 Highest rate 1700Mbps

5*5 Highest rate 2166Mbps

…..

5 GHz

WiFi 6

802.11ax

Number of antenna receiving and sending:

1*1 Highest rate 600Mbps

2*2 Highest rate 1200Mbps

…..

5 GHz

 

2.4G and 5.8G WIFI interface of ONU

The function of 2.4G and 5.8G wifi interface is the same as the network port, except that the network port is connected to the network for data transmission, and wifi is to send and receive radio signals through the wifi antenna for data transmission.

2.4G wireless interface

  1. Support 13 channels (Chinese channel),
  2. Support 20MHz and 40MHz bandwidth. When the wifi bandwidth is 20MHz, the connection rate is 144Mbps, and when the bandwidth is 40MHz, the connection rate is 300Mbps.
  3. Support multiple SSIDs (wifi connection name), support up to 4 SSIDs at the same time

 

5.8G wireless interface, following the IEEE 802.11ac protocol, some customers also call it AC wireless

  1. support the current international 5Gwifi channel in the low and high-frequency bands,
  2. Support 40MHz and 80 MHz bandwidth. When the bandwidth is 80MHz, the connection rate is 866Mbps.
  3. Support multiple SSIDs (Wi-Fi connection name) support up to 4 SSIDs at the same time

The actual rate of Wi-Fi tested in the industry (without interference) is generally about 60%-70% of the connection rate. For example, the 2.4Gwifi connection rate is 144Mbps, so in the case of no interference (signal shielding room), the maximum is almost 80-100Mbps, and the average customer tests in an open environment, and it is at the level of 35-80Mbps.

The maximum connection rate of 5.8Gwifi (2 antennas) is 866Mbps, so it can generally be tested to 500-650Mbps without interference.

2.4G and 5.8G WIFI interface of ONU

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