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5-2 Advanced Settings
The administrator can change the Slot Time, ACK Timeout, RTS threshold and fragmentation threshold settings for
the system
5-2-1 Advanced Setup
Slot Time: Slot time is in the range of 9~1489 and set in units of microsecond. The default value is 9
microsecond. Slot time is the amount of time a device waits after a collision before
retransmitting a packet. Reducing the slot time decreases the overall back-off, which
increases throughput. Back-off, which is a multiple of the slot time, is the random length
of time a station waits before sending a packet on the LAN.
ACK Timeout: ACK timeout is in the range of 1~372 and set in unit of microsecond. The default value is
64 microsecond. All data transmission in 802.11b/g request an “Acknowledgement”
(ACK) send by receiving radio. The transmitter will resend the original packet if
correspondent ACK failed to arrive within specific time interval, also refer to as “ACK
Timeout”. ACK Timeout is adjustable due to the fact that distance between two radio
links may vary in different deployment. ACK Timeout makes significant influence in
performance of long distance radio link. If ACK Timeout is set too short, transmitter will
start to “Resend” packets before ACK is received, and throughput become low due to
excessively high re-transmission. ACK Timeout is best determined by distance between
the radios, data rate of average environment. The Timeout value is calculated based on
round-trip time of packet with a little tolerance, If experiencing re-transmissions or poor
performance the ACK Timeout could be made longer to accommodate.
Slot Time and ACK Timeout settings are for long distance links. It is important to tweak settings to achieve the
optimal result based on requirement.
Beacon Interval: Beacon Interval is in the range of 40~3500 and set in unit of millisecond. The default
value is 100 msec. Access Point (AP) in IEEE 802.11 will send out a special approximated
50-byte frame, called “Beacon”. Beacon is broadcast to all the stations, provides the
basic information of AP such as SSID, channel, encryption keys, signal strength, time
stamp, support data rate. All the radio stations received beacon recognizes the existence