User's Manual

PMP 450 Planning Guide
Analyzing the RF Environment
pmp-0047 (June 2013)
2-27
Attribute
Meaning
Downlink Data
Initially set this parameter to the same value that the AP 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
APs in the cluster.
PMP 450 Series APs 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 PMP450) is functional.
Control Slots
Set this parameter to the value of the Control Slot parameter is set in the
APs.
The Calculated Frame Results display several items of interest:
Table 23 OFDM Calculated Frame Results attributes
Attribute
Meaning
Modulation
The type of radio modulation used in the calculation (OFDM for PMP
450)
Total Frame Bits
The total number of bits used in the calculated frames
Data Slots (Down/Up)
This field is based on the Downlink Data setting. For example, a result
within the typical range for a Downlink Data setting of 75% is 61/21,
meaning 61 data slots down and 21 data slots up.
Round Trip Air Delay
(MaxRange)
This is the roundtrip air delay in bit times for the Max Range value set in
the calculator
Approximate distance
(MaxRange)
The Max Range value used for frame calculation
AP Transmit End
In bit times, this is the frame position at which the AP ceases transmission.
AP Receive Start
In bit times, this is the frame position at which the AP is ready to receive
transmission from the SM.
AP Receive End
In bit times, this is the frame position at which the AP will cease receiving
transmission from the SM.
SM Receive End
In bit times, this is the frame position at which the SM will cease receiving
transmission from the AP.
SM Transmit Start
In bit times, this is the frame position at which the SM will begin
transmission.