Product specifications

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 Long If in a "noisy" network environment, the Preamble
Type should be set to Long.
 Short The Short preamble is intended for applications
where minimum overhead and maximum performance is
desired. If in a "noisy" network environment, the
performance would be decreased.
 Auto Select Auto for the USB adapter to select the
Preamble type automatically depending on the Access
Point Preamble type.
 Rate (Mbps)
The BWU613 Wireless LAN USB Adaptor provides various data
rate options for you to select. Data rates options include
Auto, Fixed 1Mb/s, 2Mb/s, Fixed 5.5Mb/s, and Fixed
11Mb/s. In most networking scenarios, you will see that the
factory-set default Auto will prove the most efficient. This
setting will allow your BWU613 to operate at the maximum
data rate. When the communications quality drops below a
certain level, the BWU613 will automatically switch to a lower
data rate. Transmitting data in lower data speeds are usually
more reliable. However, when the communications quality
improves again, the BWU613 will gradually increase the data
rate again, until it has reached the highest available transmit
rate.
 RTS Threshold
RTS Threshold is a mechanism implemented to prevent the
“Hidden Node” problem. “Hidden Node” is a situation in which
two stations are within range of the same Access Point, but are
not within range of each other. The following figure illustrates
an example of the “Hidden Node” problem. Both stations (STA)
are within range of the Access Point, however, they cannot
hear each other. Therefore, they are hidden nodes for each
other. When a station starts data transmission with the Access
Point, it might not notice that the other station is already using
the wireless medium. When these two stations send data at
the same time, they might collide when arriving
simultaneously at the Access Point. The collision will most
certainly result in a loss of messages for both stations.
Blitzz NetWave Point II USB – 11M 802.11b Wireless LAN USB Adaptor