Using The Cli To Enable Long Preambles - Cisco SD2008T-NA Configuration Manual

Chapter 5 Configuring Security Solutions
Click Apply to update the controller configuration.
Step 4
Note
Step 5 Reboot the controller using Commands > Reboot > Reboot. Click OK in response to this prompt:
Configuration will be saved and switch will be rebooted. Click ok to confirm.
The controller reboots.
Log back into the controller GUI and verify that the controller is properly configured. Follow this path
Step 6
to navigate to the 802.11b/g Global Parameters page:
Wireless > Global RF > 802.11b/g Network
If the Short Preamble Enabled 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
Step 6 Enter reset system to reboot the controller. Enter y when this prompt appears:
The system has unsaved changes. Would you like to save them now? (y/n)
The controller reboots.
OL-9141-03
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
5-5