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Cisco Wireless ISR and HWIC Access Point Configuration Guide
OL-6415-04
Chapter 2 Configuring Radio Settings
Configuring Transmit and Receive Antennas
Short preambles are enabled by default. Use the preamble-short command to enable short preambles if
they are disabled.
Configuring Transmit and Receive Antennas
You can select the antenna the wireless device uses to receive and transmit data. There are three options
for both the receive and the transmit antenna:
• Diversity—This default setting tells the wireless device to use the antenna that receives the best
signal. If the wireless device has two fixed (non-removable) antennas, you should use this setting
for both receive and transmit.
• Right—If the wireless device has removable antennas and you install a high-gain antenna on the
wireless device's right connector, you should use this setting for both receive and transmit. When
you look at the wireless device's back panel, the right antenna is on the right.
• Left—If the wireless device has removable antennas and you install a high-gain antenna on the
wireless device's left connector, you should use this setting for both receive and transmit. When you
look at the wireless device's back panel, the left antenna is on the left.
Beginning in privileged EXEC mode, follow these steps to select the antennas the wireless device uses
to receive and transmit data:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface dot11radio { 0 | 1 } Enter interface configuration mode for the radio interface. The
2.4-GHz radio is radio 0, and the 5-GHz radio is radio 1.
Step 3
antenna receive
{diversity | left | right}
Set the receive antenna to diversity, left, or right.
Note For best performance, leave the receive antenna setting
at the default setting, diversity.
Note The Cisco 850 series routers do not support diversity.
Step 4
antenna transmit
{diversity | left | right}
Set the transmit antenna to diversity, left, or right.
Note For best performance, leave the transmit antenna
setting at the default setting, diversity.
Step 5
end Return to privileged EXEC mode.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Step 3
no preamble-short Disable short preambles and enable long preambles.
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose