Configuring APs 315
Nortel WLAN—Security Switch 2300 Series Configuration Guide
An 802.11b/g radio generates unicast frames to send to a client with the preamble length specified by the
client. An 802.11b/g radio always uses a long preamble in beacons, probe responses, and other broadcast or
multicast traffic.
Generally, clients assume access points require long preambles and request to use short preambles only if the
access point with which they are associated advertises support for short preambles. You can disable the adver-
tisement of support for short preambles by setting the preamble length value to long. In this case, clients
assume that the access point supports long preambles only and the clients request long preambles.
Changing the preamble length value affects only the support advertised by the radio. Regardless of the
preamble length setting (short or long), an 802.11b/g radio accepts and can generate 802.11b/g frames with
either short or long preambles.
If any client associated with an 802.11b/g radio uses long preambles for unicast traffic, the AP still accepts
frames with short preambles but does not transmit any frames with short preambles. This change also occurs if
the access point overhears a beacon from an 802.11b/g radio on another access point that indicates the radio
has clients that require long preambles.
The default preamble length value is short. This command does not apply to 802.11a radios.
To change the preamble length advertised by 802.11b/g radios, use the following command:
set radio-profile name preamble-length {long | short}
To configure 802.11b/g radios that use the radio profile rp_long to advertise support for long preambles
instead of short preambles, type the following command:
WSS# set radio-profile rp_long preamble-length long
success: change accepted.

Resetting a radio profile parameter to its default value

To reset a radio profile parameter to its default value, use the following command:
clear radio-profile name parameter
The parameter can be one of the radio profile parameters listed in Table 8 on page 285.
All radios that use this profile must be disabled before you can delete the profile. If you specify a parameter,
the setting for the parameter is reset to its default value. The settings of the other parameters are unchanged
and the radio profile remains in the configuration. If you do not specify a parameter, the entire radio profile is
deleted from the configuration.
Caution! Make sure you specify the radio profile parameter you want to reset. If you
do not specify a parameter, WSS Software deletes the entire profile from the
configuration.