Selecting Sites for Network Elements
PTP 450 Configuration and User
pmp-0815 (August 2015)
4-19
To use the Frame Calculator to ensure that all BHMs are configured to transmit and receive
at the same time, follow the below procedure:
Procedure 13
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
BHM Receive Start
field
5
Enter a parameter set from another BHM in the system.
6
Click the
Calculate
button.
7
Scroll down the tab to the Calculated Frame Results section
8
If the recorded values of the
BHM Receive Start
fields are within
150 bit times of each other, skip to step 10.
9
If the recorded values of the
BHM Receive Start
fields are not within
150 bit times of each other, modify the
Downlink Data
parameter
until the calculated results for
BHM 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 BHM 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 BHMs 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 BHSs.
o
That is not obstructed by trees as they grow or structures that are later built.
