Antaira Industrial Gigabit IEEE 802.11b/g/n Wireless
APX-5700 User Manual V 1.0
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Fragmentation Threshold:
This specifies the maximum size for a packet before data is fragmented
into multiple packets. The range is 256-2346 bytes, or you can select the
word “off”. Setting the
fragmentation threshold too low may result in poor network performance. The use of fragmentation can
increase the reliability of frame transmissions. When sending smaller frames, collisions are much less
likely to occur, however lower values of the fragmentation threshold will result in a lower throughput.
Minor or no modifications to the fragmentation threshold value is recommended while the default
setting of 2346 is optimum in most of the wireless network cases.
Station Isolation:
This option allows packets only to be sent from the external network to the CPE and
vice versa (applicable for AP/AP WDS mode only). If the client isolation is enabled, wireless stations
connected to the same AP will not be able to interconnect on both the layer 2 (MAC) and layer 3 (IP)
level. This is effective for the associated stations and WDS peers.
Acknowledgement Timeout
The device has an auto-acknowledgement timeout algorithm which dynamically optimizes the frame
acknowledgement timeout value without user intervention. This is a critical and required feature for
stabilizing long-distance outdoor links. The user also has the ability to manually enter the value.
Distance:
This specifies the distance value in miles (or kilometers) by using a slider or you can
manually enter the value. The signal strength and throughput falls off with range. Changing the
distance value will change the ACK timeout to the new and appropriate distance value.
ACK Timeout:
Every time the station receives a data frame, it sends an ACK frame to the AP
(if transmission errors are absent). If the does not receive an ACK frame from the AP within the
set timeout, it re-sends the frame. The performance drops because too many data frames are
needed to be re-sent, thus if the timeout is set too short or too long, it will result in a poor
connection and throughput performance. By changing the ACK timeout value, it will change
the distance to the appropriate distance value for the ACK timeout.
Auto:
Adjust the control and enable the
‘ACK Timeout Self-Configuration’ feature. If enabled,
the ACK timeout value will be dynamically derived using an algorithm similar to the
conservative rate algorithm. It is not recommended to use the auto adjust option for long range
links because if the signal level is low, there could be a high level of interference.
If two or more stations are located at considerably different distances from the access point,
the highest ACK timeout for the farthest station should be set at the access point side. It is not
recommended to use the auto adjust option for point-to-multipoint connections as it will not
warrant the highest network performance.
