PMP 450 Planning Guide
To use the Frame Calculator to ensure that all APs are configured to transmit and receive at the same time, follow
the procedure below:
Procedure 4 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.
9
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.
Selecting Sites for Network Elements
The APs must be positioned
•
with hardware that the wind and ambient vibrations cannot flex or move.
•
where a tower or rooftop is available or can be erected.
•
where a grounding system is available.
•
with lightning arrestors to transport lightning strikes away from equipment.
•
at a proper height:
o
higher than the tallest points of objects immediately around them (such as trees, buildings, and tower legs).
o
at least 2 feet (0.6 meters) below the tallest point on the tower, pole, or roof (for lightning protection).
•
away from high-RF energy sites (such as AM or FM stations, high-powered antennas, and live AM radio
towers).
•
in line-of-sight paths
o
to the SMs.
o
that will not be obstructed by trees as they grow or structures that are later built.
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pmp-0047 (March 2014)
Summary of Contents for PMP 450
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