Draytek Vigor2830 Series User Manual page 87

Packet-OVERDRIVE
Hide SSID
Long Preamble
This feature can enhance the performance in data transmission
about 40%* more (by checking Tx Burst). It is active only
when both sides of Access Point and Station (in wireless client)
invoke this function at the same time. That is, the wireless
client must support this feature and invoke the function, too.
Note: Vigor N61 wireless adapter supports this function.
Therefore, you can use and install it into your PC for matching
with Packet-OVERDRIVE (refer to the following picture of
Vigor N61 wireless utility window, choose Enable for
TxBURST on the tab of Option).
Check it to prevent from wireless sniffing and make it harder
for unauthorized clients or STAs to join your wireless LAN.
Depending on the wireless utility, the user may only see the
information except SSID or just cannot see any thing about
Vigor wireless router while site surveying. The system allows
you to set four sets of SSID for different usage. In default, the
first set of SSID will be enabled. You can hide it for your
necessity.
This option is to define the length of the sync field in an 802.11
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Vigor2830 Series User's Guide