This object specifies the current radio preamble
type in use by the station. Possible values:
long(1) - long preambles
short(2) - short preambles.
A long preamble ensures compatibility between
access point and all early models of Cisco
Aironet Wireless LAN adapters (client devices).
A short preamble improves throughput performance.
The default preamble type is short(2).