Normally, the clients in 802.11b mode negotiate the length of the preamble with the AP. "Long preamble" should only be set when the clients require this setting to be fixed.
- SNMP ID:
 - 2.37.1.1.15
 - Console path:
 - Setup > WLAN-Management > AP-Configuration > Networkprofiles
 - Possible values:
 - Auto
 - Long
 
- Default:
 - Auto