AirLive WHA-5500CPE-NT - Manual (Page 48)

4. Web Management-Wireless and WAN Settings
AirLive WHA-5500CPE-NT User’s Manual 42
transmission. Any unicast (data or control) frames larger than specified RTS threshold
must be transmitted following the RTS/CTS handshake exchange mechanism. The
RTS threshold should have a value between 256-2347 bytes, with a default of 2347. It
is recommended that this value does not deviate from the default too much.
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Fragmentation: When the size of a unicast frame exceeds the fragmentation
threshold, it will be fragmented before the transmission. It should have a value of
256-2346 bytes, with a default of 2346. If you experience a high packet error rate,
you should slightly decrease the Fragmentation Threshold.
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DTIM Interval: The WHA-5500CPE-NT buffers packets for stations that operate in the
power-saving mode. The Delivery Traffic Indication Message (DTIM) informs such
power-conserving stations that there are packets waiting to be received by them. The
DTIM interval specifies how often the beacon frame should contain DTIMs. It should
have a value between 1 to 255, with a default value of 3.
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User Limitation: This limitation applies to number of wireless clients the device can
associate. If you need to serve wireless connection to large number of users in one
location. You can deploy many APs and limit the number of wireless clients, so any
additional wireless connection attempt will be rejected (therefore, redirect to other AP).
The range of user limitation is from 1 to 100.
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Age Out Timer: Set the age out timer for the wireless client. If there is no traffic from
client for more than the timer, the wireless client will be dropped. The default is 300
sec. This function is available only for the Access Point and AP router mode.
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Rate Control: Select here to change the Data Rate for the radio. Lower data rate
sometimes provide longer distance. In most cases, however, we recommend to keep
the setting at “Best”.
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Noise Immunity: Adaptive Noise Immunity is one of the new function in Atheros
driver to enhance the performance in interference environment.
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AckTimeOut: When a packet is sent out from one wireless station to the other, it will
waits for an Acknowledgement frame from the remote station. The station will only
wait for a certain amount of time, this time is called the ACK timeout. If the ACK is
NOT received within that timeout period then the packet will be re-transmitted resulting
in reduced throughput. If the ACK setting is too high, then throughput will be lost due
to waiting for the Ack Window to timeout on lost packets. If the ACK setting is too low
then the ACK window will have expired and the returning packet will be dropped,
greatly lowering throughput. By having the ability to adjust the ACK setting we can
effectively optimize the throughput over long distance links.
The easiest way to enter AckTimeOut value is by entering the distance in “Operation
Mode -> Setup -> Distance”. The WHA-5500CPE-NT will then calculate and enter the