D-4
Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) Installation and Configuration Guide
OL-4211-03
Appendix D Channels, Power Levels, and Antenna Gains
Maximum Power Levels and Antenna Gains
Maximum Power Levels and Antenna Gains
IEEE 802.11a
An improper combination of power level and antenna gain can result in equivalent isotropic radiated
power (EIRP) above the amount allowed per regulatory domain. Table D-3 indicates the maximum EIRP
allowed for each data rate in the IEEE 802.11a regulatory domains.
IEEE 802.11b
An improper combination of power level and antenna gain can result in equivalent isotropic radiated
power (EIRP) above the amount allowed per regulatory domain. Table D-4 indicates the maximum EIRP
allowed for each data rate in the IEEE 802.11b regulatory domains.
Table D-3 Maximum EIRP for IEEE 802.11a
Data Rate
Maximum EIRP for PC-Cardbus Card
with 0-dBi Antenna Gain and PCI Card
with 1-dBi Antenna Gain
mW dBm
6 Mbps 40 16
9 Mbps 40 16
12 Mbps 40 16
18 Mbps 40 16
24 Mbps 40 16
36 Mbps 25.1 14
48 Mbps 20 13
54 Mbps 20 13
Table D-4 Maximum EIRP for IEEE 802.11b
Data Rate
Maximum EIRP for PC-Cardbus Card
with 0-dBi Antenna Gain and PCI Card
with 1-dBi Antenna Gain
mW dBm
1 Mbps 100 20
2 Mbps 100 20
5.5 Mbps 100 20
11 Mbps 100 20
