US Robotics MAXg User Manual page 56

Wireless MAXg Access Point User Guide
experiencing interference or wireless network problems, changing the channel may
solve the problem.
54g mode: Select Automatic, 802.11g Performance, or 802.11b Only. If you are
using all 802.11g equipment, 802.11g Performance will provide the fastest
performance. If you select 802.11b Only, all clients that are capable of 802.11b will
connect to the Wireless MAXg Access Point at 802.11b data rates.
Automatic 54g protection: If you select this option, the access point will use
Request to Send/Clear to Send (RTS/CTS) to improve the performance in 802.11
mixed environments. If this is not selected, the 802.11n performance will be
maximized under most conditions while the other 802.11 modes (802.11b, etc.) will
be secondary.
Supported rate: Select the wireless link rate at which you want information
transmitted and received on your wireless network. You can select Auto, 1, 2, 5.5, 6,
9, 11, 12, 18, 24, 36, 48, 54.
Basic rate set: Select the basic rate that wireless clients must support: Default, All,
or 1 & 2 Mbps.
Acceleration: Select None, 54g+ (Xpress™), or MAXg (125 Mbps). These
features determine either normal speed rates or accelerated rates. Set the mode to
54g+ (Xpress™) for the widest compatibility. The Wi-Fi Multimedia (WMM) feature is
not available if you select MAXg (125 Mbps). 125 Mbps can only be achieved if all
wireless clients are MAXg wireless clients and your wireless environment does not
have interference from other radio devices.
Beacon Interval: The amount of time between beacon transmissions. A beacon is
basically a heartbeat for a wireless client or access point, sending out a signal
informing the network that it is still active. This should be set between 1 and 1000
milliseconds. The default beacon interval is 100 ms.
RTS threshold: The minimum size in bytes for which the Request to Send/Clear to
Send (RTS/CTS) channel contention mechanism is used. In a network with significant
radio interference or large number of wireless devices on the same channel, reducing
the RTS Threshold might help in reducing frame loss. The RTS threshold is 2347 bytes
by default, which is the maximum value.
Fragmentation threshold: The maximum level that the access point will reach when
sending information in packets before the packets are broken into fragments.
Typically, if you are experiencing problems sending information, it is because there is
other traffic on the network and the data being transmitted is colliding. This might be
corrected by the information being broken into fragments. The lower the
fragmentation threshold value, the smaller a packet has to be before it is broken into
fragments. If the maximum is set (2346), fragmentation is essentially disabled. You
should only change this level if you are an advanced user.
DTIM Interval: The amount of time after which buffered broadcast and multicast
frames will be delivered to the wireless clients. This allows mobile stations to conserve
power. If you are using applications that use broadcast or multicast frames for
delivering data, you should use a Delivery Traffic Indication Message (DTIM) Interval
of 1 to minimize delay for real-time traffic, such as multicast audio and video streams.
Preamble: Defines the length of the Cyclic Redundancy Check (CRC) block for
communication between the access point and wireless clients. The preamble consists
of the Synchronization and Start Frame Delimiter (SFD) fields. The sync field is used
to indicate the delivery of a frame to wireless stations, to measure frequency of the
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