E-DOC-CTC-20060609-0001 v2.0
Chapter 2
802.11 Standards
16
2.2 802.11a
Technical specifications
The 802.11a standard operates in the U-NII band and applies Orthogonal Frequency Division Multiplexing
(OFDM) as modulation technique. The data transfer rate can be up to 54 Mbps, but will be scaled back to 48,
36, 24, 18, 12, 9 or 6 Mbps (this is known as Adaptive Rate Selection) when the signal quality becomes an
issue. 802.11a allows 64 users per access point.
There is no compatibility with either 802.11b or 802.11g.
U-NII band 802.11a channel allocation
The following table summarizes the 802.11a channels in the U-NII band. The assigned channels can differ
from country to country.
!
The regulatory information in this section is given for information only. This information is subject
to change by the regulatory bodies. The FCC is the regulatory body in the U.S., the ETSI is the
regulatory body in Europe.
Channel
Identifier
Centre
Frequency
(GHz)
Regulatory Domain
America ETSI Japan Taiwan Singapore
34 5.170 - - Y - -
36 5.180 Y Y - - Y
38 5.190 - - Y - -
40 5.200 Y Y - - Y
42 5.210 - - Y - -
44 5.220 Y Y - - Y
46 5.230 - - Y - -
48 5.240 Y Y - - Y
52 5.260 Y Y - Y -
56 5.280 Y Y - Y -
60 5.300 Y Y - Y -
64 5.320 Y Y - Y -
100 5.500 - Y - - -
104 5.520 - Y - - -
108 5.540 - Y - - -
112 5.560 - Y - - -
116 5.580 - Y - - -
120 5.600 - Y - - -
124 5.620 - Y - - -
To Next Page
Loading...
