Cambium Networks PMP 450 AP, Configuration Manual

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Chapter 2: Tools Using the OFDM Frame Calculator tool
Page
2-360
AP Receive End In bit times, this is the frame position at which the AP/BHM will cease
receiving transmission from the SM/BHS.
SM Receive End In bit times, this is the frame position at which the SM/BHS will cease
receiving transmission from the AP/BHM.
SM Transmit Start In bit times, this is the frame position at which the SM/BHS starts the
transmission.
SM One Way Air
Delay This filed displays the time in ns, that SM/BHS is away from the AP/BHM.
SM Approximate
distance This field displays an approximate distance in miles (feet) that the SM/BHS is
away from the AP/BHM.
To use the Frame Calculator to ensure that all APs or BHMs are configured to transmit and receive at
the same time, follow the procedure below:
Procedure 26 Using the Frame Calculator
1 Populate the OFDM Frame Calculator parameters with appropriate values as described
above.
2 Click the Calculate button.
3 Scroll down the tab to the Calculated Frame Results section
4 Record the value of the AP Receive Start field
5 Enter a parameter set from another AP in the system – for example, an AP in the same
cluster that has a higher Max Range value configured.
6 Click the Calculate button.
7 Scroll down the tab to the Calculated Frame Results section
8 If the recorded values of the AP Receive Start fields are within 150 bit times of each other,
skip to step 10.
If the recorded values of the AP Receive Start fields are not within 150 bit times of each
other, modify the Downlink Data parameter until the calculated results for AP Receive
Start are within 300 bit time of each other, if possible, 150 bit time.
10 Access the Radio tab in the Configuration web page of each AP in the cluster and change
its Downlink Data parameter (percentage) to the last value that was used in the Frame
Calculator.