D-Link DWL-3600AP Administrator's Manual page 167

Unified Access Point Administrator's Guide Configuring Radio Settings
5. From the Channel Bandwidth field, select 40 MHz.
6. In the Maximum Stations field, change the value to 100.
7. In the Transmit Power field, change the value to 75.
The following image shows the Radio page with the settings specified in this example.
8. Click Apply to update the AP with the new settings.
D-Link Unified Access Point Administrator's Guide
November 2011 Page 167