User manual

77
Fragmentation
Threshold
A threshold, specified in bytes, that determines whether
packets will be fragmented and at what size. On an 802.11
WLAN, packets that exceed the fragmentation threshold are
split into smaller units suitable for the circuit size. Packets
smaller than the specified fragmentation threshold value are
not fragmented.
Values between 256 and 2346 can be entered. The value should
remain at its default setting of 2346, if possible, since setting
the Fragmentation Threshold too low may result in poor
performance. If you experience a high packet error rate, try to
slightly increase the Fragmentation Threshold.
RTS Threshold Request to Send, set in bytes, specifies the packet size beyond
which the WLAN Card invokes its RTS/CTS mechanism. Packets
that exceed the specified RTS threshold trigger the RTS/CTS
mechanism. Smaller packets are sent without usin
g
RTS/CTS.
The default setting of 2347 (maximum length) disables RTS
Threshold altogether.
DTIM Interval Delivery Traffic Indication Message (DTIM) is also known as
Beacon Rate. The entry ran
g
e is a value between 1 and 65535.
A DTIM is a countdown variable that informs clients of the next
window for listening to broadcast and multicast messages.
When the AP has buffered broadcast or multicast messages for
associated clients, it sends the next DTIM with a DTIM Interval
value. AP Clients hear the beacons and awaken to receive the
broadcast and multicast messages. The default is 1.
Beacon Interval The amount of time between beacon transmissions in
milliseconds. The default is 100 ms and the acceptable range is
1 – 65535. The beacon transmissions identify the presence of
an access point. By default, network devices passively scan all
RF channels listening for beacons coming from access points.
Before a station enters power save mode, the station needs the
beacon interval to know when to wake up to receive the beacon
(and learn whether there are buffered frames at the access
point).
Maximum
Associated
Clients
The maximum number of clients allowed to connect to the
router.
Xpress
TM
Tech n o l ogy
Xpress Technology is compliant with draft specifications of two
planned wireless industry standards. Default is disabled.
54g
TM
Mode Select Auto mode for greatest compatibility. Select
Performance mode for the fastest performance among 54g
certified equipment. Select LRS mode if you are experiencing
difficulty with legacy 802.11b equipment. If this does not work,
you may also try 802.11b only mode.
54g Protection In Auto mode, the router will use RTS/CTS to improve 802.11g
performance in mixed 802.11g/802.11b networks. Turning
protection Off will maximize 802.11g throughput under most
conditions.
Preamble Type Short preamble is intended for applications where maximum
throughput is desired but it does not work with legacy
equipment. Long preamble works with the current 1 and 2
Mbit/s DSSS specification as described in IEEE Std 802.11-1999
Transmi t Pow er Set the power output (by percentage) as desired.