Cambium PTP 450 series, User Manual

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PTP 450 User Guide Analyzing the RF Environment
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ptp-450 (July 2014)
Figure 15 OFDM Frame Calculator tab
In the Frame Calculator tab, you can set the following parameters.
Table 39 OFDM Frame Calculator tab attributes
Attribute Meaning
Link Mode For BHM to BHS frame calculations, select Multipoint Link
Platform Type BHM/BHM
Use the drop-down list to select the hardware series (board type) of the
BHM.
Platform Type BHS/BHS
Use the drop-down list to select the hardware series (board type) of the
BHS.
Channel Bandwidth Set this to the channel bandwidth used in the BHM.
Cyclic Prefix Set this to the cyclic prefix used in the BHM.
Max Range
Set to the same value as the Max Range parameter is set in the BHM(s).
Air Delay This field should be left at the default of 0 ns.
Downlink Data Initially set this parameter to the same value that the BHM has for its
Downlink Data parameter (percentage). Then, as you use the Frame
Calculator tool in Procedure 4 , you will vary the value in this parameter to
find the proper value to write into the Downlink Data parameter of all
BHMs in the cluster.
PTP 450 Series BHMs offer a range of 15% to 85%, and default to 75%.
The value that you set in this parameter has the following interaction with
the value of the Max Range parameter (above):
The default Max Range value is 5 miles and, at that distance, the
maximum Downlink Data value (85% in PTP450) is functional.
Control Slots Set this parameter to the value of the Control Slot parameter is set in the
BHMs.