Draytek Vigor 2110 User Manual page 253

Long Preamble
Packet-OVERDRIVE
Rate Control
After finishing all the settings here, please click OK to save the configuration.
Vigor2110 Series User's Guide
This option is to define the length of the sync field in an
802.11 packet. Most modern wireless network uses short
preamble with 56 bit sync filed instead of long preamble with
128 bit sync field. However, some original 11b wireless
network devices only support long preamble. Check it to use
Long Preamble if needed to communicate with this kind of
devices.
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).
It controls the data transmission rate through wireless
connection.
Upload – Check Enable and type the transmitting rate for data
upload. Default value is 30,000 kbps.
Download – Type the transmitting rate for data download.
Default value is 30,000 kbps.
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