Using The Cli To Enable Long Preambles - Cisco 2100 Series Configuration Manual

Chapter 5 Configuring Security Solutions
Note
Click Commands > Reboot > Reboot > Save and Reboot to reboot the controller. Click OK in response
Step 5
to this prompt:
Configuration will be saved and the controller will be rebooted. Click ok to confirm.
The controller reboots.
Log back into the controller GUI to verify that the controller is properly configured.
Step 6
Step 7 Click Wireless > 802.11b/g/n > Network to open the 802.11b/g Global Parameters page. If the Short
Preamble check box is unchecked, the controller is optimized for SpectraLink NetLink phones.

Using the CLI to Enable Long Preambles

Use this procedure to use the CLI to enable long preambles to optimize the operation of SpectraLink
NetLink phones on your wireless LAN.
Log into the controller CLI.
Step 1
Enter show 802.11b and check the Short preamble mandatory parameter. If the parameter indicates that
Step 2
short preambles are enabled, continue with this procedure. This example shows that short preambles are
enabled:
Short Preamble mandatory....................... Enabled
However, if the parameter shows that short preambles are disabled (which means that long preambles
are enabled), the controller is already optimized for SpectraLink NetLink phones and you do not need
to continue this procedure. This example shows that short preambles are disabled:
Short Preamble mandatory....................... Disabled
Enter config 802.11b disable network to disable the 802.11b/g network. (You cannot enable long
Step 3
preambles on the 802.11a network.)
Enter config 802.11b preamble long to enable long preambles.
Step 4
Enter config 802.11b enable network to re-enable the 802.11b/g network.
Step 5
Enter reset system to reboot the controller. Enter y when this prompt appears:
Step 6
The system has unsaved changes. Would you like to save them now? (y/n)
The controller reboots.
Step 7 To verify that the controller is properly configured, log back into the CLI and enter show 802.11b to
view these parameters:
802.11b Network................................ Enabled
Short Preamble mandatory....................... Disabled
These parameters show that the 802.11b/g network is enabled and that short preambles are disabled.
OL-17037-01
If you do not already have an active CLI session to the controller, Cisco recommends that you
start a CLI session to reboot the controller and watch the reboot process. A CLI session is also
useful because the GUI loses its connection when the controller reboots.
Configuring the System for SpectraLink NetLink Telephones
Cisco Wireless LAN Controller Configuration Guide
5-51