User's Manual

Chapter 8: Tools
Using the OFDM Frame Calculator tool
Page 8-44
Platform Type
SM/BHS
Use the drop-down list to select the hardware series (board type) of the
SM/BHS.
Channel Bandwidth
Set this to the channel bandwidth used in the AP/BHM.
Cyclic Prefix
Set this to the cyclic prefix used in the AP/BHM.
Max Range
Set to the same value as the Max Range parameter is set in the AP(s) or
BHM(s).
Frame Period
Set to the same value as the Frame Period parameter is set in the AP(s)
or BHM(s).
Downlink Data
Initially set this parameter to the same value that the AP/BHM has for its
Downlink Data parameter (percentage). Then, use the Frame Calculator
tool procedure as described in Using the Frame Calculator on page 8-45,
you will vary the value in this parameter to find the proper value to write
into the Downlink Data parameter of all APs or BHMs in the cluster.
PMP 450 Platform Family APs or 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 PMP 450 Platform) is functional.
Contention Slots
This field indicates the number of (reserved) Contention Slots configured
by the operator. Set this parameter to the value of the Contention Slot
parameter is set in the APs or BHMs.
SM/BHS One Way
Air Delay
This field displays the time in ns (nano seconds), that a SM/BHS is away
from the AP/BHM.
The Calculated Frame Results display several items of interest:
Table 190 OFDM Calculated Frame Results attributes
Attribute
Meaning
Modulation
The type of radio modulation used in the calculation (OFDM for 450
Platform Family)
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.
Contention Slots
This field indicates the number of (reserved) Contention Slots configured
by the operator.
Air Delay for Max
Range
This is the roundtrip air delay in bit times for the Max Range value set in
the calculator