User's Manual

Chapter 4: Access Point Configuration
IEEE 802.11 Direct Sequence Radio Parameters Menu
66
Teklogix 9150 Wireless Gateway User Manual
rebooted and, if so, how to recover. If the controller was rebooted, the terminal
closes all sessions and fully re-initializes. If the base station was rebooted, or if the
terminal moved to a different 9150, a warm initialize is done (no data will be lost).
The Beacon Period parameter acceptable value ranges from 1 to 20 seconds. The
default value is 2.
Terminal Offline Timeout
This parameter sets the time (in minutes) before the 802.IQ task on the 9150 will
send an offline message to the cellular master declaring the terminal offline.
The acceptable value ranges from 1 to 240. The default value is 5.
4.2.1.3 802.IQ v
1
Configuration Submenu
Enabled
This parameter enables ( √ ) or disables the 802.IQ feature. The default value is disabled.
Initial RTT
The parameter Initial RTT (Round-Trip Time) is used to help determine the elapsed
time, in milliseconds, between an “access point” transmission and a “terminal”
acknowledgement. The access point continuously adjusts the acceptable round trip
time, calculating the average elapsed time over a number of transmissions for each
terminal. If an acknowledgement takes longer to receive than the average round trip
time calculated, the access point will resend the transmission.
Because access point(s) cannot calculate an average round trip time without a
number of transmissions, a starting point or “Initial Round Trip Time” is required.
The access point uses the time assigned to the “Initial RTT” parameter as a starting
value for round trip calculations. Once the access point begins transmitting and
receiving data to and from the terminal, this value will be adjusted to reflect the
actual average round trip time between transmissions and acknowledgements.
The acceptable value ranges from 10 to 10000. The default value is 1000.