Manual

4. Web Management-Wireless and WAN Settings

AirLive WHA-5500CPE-NT User’s Manual

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.

 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.

 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.

 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.

 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.

 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”.

 Noise Immunity: Adaptive Noise Immunity is one of the new function in Atheros

driver to enhance the performance in interference environment.

 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