802.11 Wireless Network Standards

In its first models, Wireless technology used infrared to communicate between devices. The model required that the transceivers (devices capable of transmitting and receiving data simultaneously) were facing each other in an area free from physical interference, a problem that greatly limits transmission capacity, as the devices must be practically in the same environment. , free from walls or any other objects that could interfere with the direct exchange between devices.

In mid-1986, the FCC, a North American regulatory body, authorized the use of the “Spread Spectrum” radio frequency transmission technology in the ISM transmission band, in 900 MHz, 2.4 GHz and 5.2 GHz. exclusively for military use.

Wireless or wireless networks are a flexible communication system, implemented as an extension or alternative to traditional wired networks. Data is transmitted by electromagnetic waves, such as radio frequency, which do not need propagation material, eliminating the use of cables and allowing users to be mobile.

They connect computers and other equipment cleanly, without the need for cables or repairs.

Wi-Fi working diagram

diagrama funcionamento do wi-fi
Wi-Fi operation diagram

Today, wireless networks use the same reception concept used by radios, cell phones and similar equipment, which use waves to transmit and receive signals. This is because the 2.4GHz and 5GHz frequencies have such a short wavelength that signals can pass through solid objects such as walls, allowing for more comprehensive but not seamless data transmission. It is still necessary to plan the network very well so that there are no unpleasant surprises.

IEEE 802.11 Wireless Network Standards

IEEE 802.11a

It reaches speeds of 54 Mbps within IEEE standards. This architecture operates on the 5 GHz frequency and initially supports 64 users per Access Point (AP). Its main advantage is speed and the biggest disadvantage is its incompatibility with standards 802.11 b and g.

IEEE 802.11b

It achieves a speed of 11 Mbps standardized by IEEE. It operates on 2.4 GHz frequency. Initially it supports 32 users per access point. A negative point in this standard is the high interference both in the transmission and reception of signals, because it uses a 2.4 GHz carrier, the same used by mobile phones, microwave ovens and bluetooth devices.

IEEE 802.11g

It is based on compatibility with 802.11b devices and offers a speed of 54 Mbps. It works within the 2.4 GHz frequency. It has the same drawbacks of the 802.11b standard (interference with other equipment).

Comparative table of WiFi standards

tabela comparativa de padroes wi-fi
Comparative table of WiFi standards

How to identify the best standard for wireless networking

The best known standard today is 802.11b (also called Wi-Fi), created in 1999. The 802.11a protocol emerged as a much faster option, but because it uses a different frequency, it is not compatible with the previous standard. The solution to the problem came with the creation of 802.11g, which has the same speed as “a” and full compatibility with “b”.

Consumers need not be concerned about the issue of coexistence between models. All products that reach the market with the Wi-Fi seal are compatible with each other, as long as they operate in the same band, either 2.4Ghz or 5GHz.

Source: Create Sites, Digerati, TSIN Uninove

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