User's Manual

Configuration
Trango Broadband Wireless — Atlas5055 page 23
In this example the user sets the power to 19dBm and the speed to 24 Mbps:
#> power 19
Execution in progress...
.
19 dBm (-4..19)
Success.
#> speed 24
24 Mbps
Success.
#>
MU Autoscan Feature Description
This feature allows the RU to actively search all channels and polarizations for its peer MU in the event of a
disassociation. This feature is useful if the user frequently changes the channel/polarization of the MU . If enabled, the
autoscanmu routine in the RU performs a search for the peer MU by actively scanning all available channels and
polarizations. NOTE: Autoscanning isalways active when operating on DFS channels.
Notes regarding the autoscanmu feature:
• The RU will not activate the autoscan process after first 60 seconds of turning on opmode.
• The RU will start the auto scan process If RU loses association for more than 10 seconds,.
• The whole process will scan all available frequencies and polarizations in channel tables. The radio will spend
10 to 12 seconds for each frequency.
• For each frequency, radio will survey both polarizations, H and V. It will record the following information:
• association
• average RSSI of receiving P5055M packets
• After scanning all available frequencies in channel plan, the radio will select the channel based on the strongest
average RSSI for receiving packets.
• If no channel is selected after completing the cycle, the process will start again.
Example:
#> autoscanmu on
Success.
#>
Automatic Rate Shifting Feature Description
With autorateshift feature enabled, the radios will automatically renegotiate the modulation method and speed
speed to maximize wireless link integrity. The link speed will vary depending on two factors: 1) the number of
ARQ errors received, 2)successful processing of special link assessment packets sent in both the current and
next higher speed. The radio will shift to the next higher in speed when no errors are detected. The radio will
shift down in speed if error rate is excessive.
Notes regarding the autorateshift feature:
1. The radio will begin initial speed test when upon association to peer radio. There are 40 steps and around 50
seconds to complete this initial test. The radio will send link assessment packets (3600 byte packets at a rate of
100 packets per second) at the highest speed (54 Mbps). The radio will deliver payload at the speed which is
specified before association. If the assessment packet dropping rate is higher than 10 percent, the speed test will
decrease the speed for assessment packets. If the current payload speed is higher than the speed of assessment
packet, the radio will set the current payload speed to be the same as the assessment packet’s speed. If the
current payload speed is lower than the assessment packet’s speed and more than 500 assessment packets have
been transmitted, the radio will set the payload speed to be the same as assessment packet’s speed.