Cisco Cisco Aironet 350 Mini-PCI Wireless LAN Client Adapter Guia Do Desenho
3-6
Enterprise Mobility 4.1 Design Guide
OL-14435-01
Chapter 3 WLAN Radio Frequency Design Considerations
RF Basics
Understanding the IEEE 802.11 Standards
IEEE 802.11 is the working group within the Institute for Electrical and Electronics Engineers (IEEE)
responsible for wireless LAN standards at the physical and link layer (Layer 1 and Layer 2) of the OSI
model, as compared to the Internet Engineering Task Force (IETF, which works on network layer (Layer
3) protocols. Within the 802.11 working group are a number of task groups that are responsible for
elements of the 802.11 WLAN standard.
responsible for wireless LAN standards at the physical and link layer (Layer 1 and Layer 2) of the OSI
model, as compared to the Internet Engineering Task Force (IETF, which works on network layer (Layer
3) protocols. Within the 802.11 working group are a number of task groups that are responsible for
elements of the 802.11 WLAN standard.
summarizes some of the task group initiatives.
For more information on these working groups, see the following URL:
Taiwan
52
56
60
64
5260
5280
5300
5320
EMEA 1
Australia
New Zealand
Same as USA
Same as USA
Same as USA
EMEA 2
1
U-NII lower band
36
40
44
5.180
5.200
5.220
1.
Some EMEA countries, such as Denmark and Germany, are limited to 20 mW.
Table 3-4
Additional Frequency Bands and Channel Numbers for Other Regulatory Domains
Table 3-5
IEEE 802.11 Task Group Activities
Task Group
Project
MAC
To develop one common MAC for WLANs in conjunction with a physical layer
entity (PHY) task group
entity (PHY) task group
PHY
To develop three WLAN PHYs—Infrared, 2.4 GHz FHSS, 2.4 GHz DSSS
a
To develop PHY for 5 GHz UNII band
b
To develop higher rate PHY in 2.4 GHz band
c
To cover bridge operation with 802.11 MACs (spanning tree)
d
To define physical layer requirements for 802.11 operation in other regulatory
domains (countries)
domains (countries)
e
To enhance 802.11 MAC for QoS
f
To develop recommended practices for Inter Access Point Protocol (IAPP) for
multi-vendor use
multi-vendor use
g
To develop higher speed PHY extension to 802.11b (54 Mbps)
h
To enhance 802.11 MAC and 802.11a PHY-Dynamic Frequency selection (DFS),
Transmit Power control (TPC)
Transmit Power control (TPC)
i
To enhance 802.11 MAC security and authentication mechanisms
j
To enhance the 802.11 standard and amendments to add channel selection for 4.9
GHz and 5 GHz in Japan
GHz and 5 GHz in Japan