User's Manual

4. Wireless Settings
 IAPP: IAPP (Inter Access Point Protocol) is designed for the enforcement of unique
association throughout a ESS (Extended Service Set) and a secure exchange of
station’s security context between current access point (AP) and new AP during
handoff period.
 Protection: Select Enabled or Disabled to execute the security function.
 Aggregation: Select Enabled or Disabled to execute this function.
 Short GI: Select Enabled or Disabled to execute this function.
 ACK Timeout: Acknowledgement Timeout Windows. 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. This is especially true for 802.11a and 802.11g
networks.
Setting the correct ACK timeout value need to consider 3 factors: distance, AP
response time, and interference. The AC.TOP provides ACK adjustment capability in
form of either distance or direct input. When you enter the distance parameter, the
AC.TOP will automatically calculate the correct ACK timeout value, it should have a
value of 0-255 sec.
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