92 Keysight WLAN Measurement Guide
Concepts
WLAN Standards
The 802.11a uses 5.15–5.25, 5.25–5.35 and 5.725–5.825 GHz unlicensed
national information infrastructure (UNII) bands, each having restrictions
imposed on the maximum allowed output power. Table defines the maximum
allowable output power for the United States.
Channel center frequencies are defined at every integral multiple of 5 MHz
above 5 GHz. The relationship between center frequency and channel number
is given by the following equation:
Channel center frequency = 5000 + 5 × nch (MHz)
where
nch = 0,1,…200
This definition provides a unique numbering system for all channels with 5 MHz
spacing from 5 GHz to 6 GHz, as well as the flexibility to define channelization
sets for all current and future regulatory domains. The set of valid operating
channel numbers by regulatory domain is defined in
.
Table 3-3
Transmit power level for the United States
Frequency band (GHz)
Maximum output power with up to 6 dBi
antenna gain (mW)
5.15-5.25
40 (2.5 mW/MHz)
5.25-5.35
200 (12.5 mW/MHz)
5.725-5.825
800 (50 mW/MHz)
Table 3-4
Valid operating channel numbers by regulatory domain and band
Regulatory
domain
Band (GHz)
Operating
channel
numbers
Channel center
frequencies (MHz)
United States
U-NII lower band
(5.15 - 5.25)
36
40
44
48
5180
5200
5220
5240
United States
U-NII middle band
(5.25 - 5.35)
52
56
60
64
5260
5280
5300
5320
United States
U-NII upper band
(5.725 - 5.825)
149
153
157
161
5745
5765
5785
5805