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Frequency
Typical throughput
Max bandwidth
Range (m) indoor/outdoor
802.11
2.4 GHz
0.9 Mbps
2 Mbps
20/100
802.11a
5 GHz
23 Mbps
54 Mbps
35/120
802.11b
4.3 Mbps
11 Mbps
38/140
802.11g
19 Mbps
802.11n
2.4/5 GHz
74 Mbps
150 Mbps
70/250
When developing its family of standards, the `IEEE 802.11 working group <http://www.ieee802.org/11/>`_ took a similar approach as the `IEEE 802.3 working group <http://www.ieee802.org/3/>`_ that developed various types of physical layers for Ethernet networks. 802.11 networks use the CSMA/CA Medium Access Control technique described earlier and they all assume the same architecture and use the same frame format.
The architecture of WiFi networks is slightly different from the Local Area Networks that we have discussed until now. There are, in practice, two main types of WiFi networks : `independent` or `adhoc` networks and `infrastructure` networks [#fBSS]_. An `independent` or `adhoc` network is composed of a set of devices that communicate with each other. These devices play the same role and the `adhoc` network is usually not connected to the global Internet. `Adhoc` networks are used when for example a few laptops need to exchange information or to connect a computer with a WiFi printer.
An 802.11 independent or adhoc network
Most WiFi networks are `infrastructure` networks. An `infrastructure` network contains one or more `access points` that are attached to a fixed Local Area Network (usually an Ethernet network) that is connected to other networks such as the Internet. The figure below shows such a network with two access points and four WiFi devices. Each WiFi device is associated to one access point and uses this access point as a relay to exchange frames with the devices that are associated to another access point or reachable through the LAN.
An 802.11 infrastructure network
An 802.11 access point is a relay that operates in the datalink layer like switches. The figure below represents the layers of the reference model that are involved when a WiFi host communicates with a host attached to an Ethernet network through an access point.
Component Translation Difference to current string
This translation Propagated Read only cnp3-ebook/protocols/lan
The following string has the same context and source.
Propagated Read only cnp3-ebook/protocols/wifi

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Glossary

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String information

Flags
read-only
Source string location
../../protocols/wifi.rst:24
String age
3 years ago
Source string age
3 years ago
Translation file
locale/pot/protocols/lan.pot, string 152