Automatic Transmit Power Control (Atpc); Atpc Max Power & Step Size; Transmitter Maximum Power Output - Trango Systems TrangoLINK GigaPlus User Manual

Automatic Transmit Power Control (ATPC)

ATPC and targetRSSI work together to control the remote side power output in order to
achieve optimal signal strength. ATPC can be enabled or disabled. When enabled,
ATPC will adjust the power of the remote side based on the local targetRSSI setting.
If the current RSSI value is lower than the targetRSSI setting of the local radio, the local
radio will send commands over the air instructing the remote radio unit to increase its
output power to achieve the targetRSSI setting within +/- 2 dB.
If the RSSI value is higher that the targetRSSI setting, the remote radio will be
commanded to reduce the power until either the target level is reached within +/- 2 dB
or the TX power has hit the minimum level (See Table 8).
ATPC has Step Size and Max Power settings to limit the output power of the unit and
prevent a violation of the license.
The power setting cannot be changed once ATPC is enabled. To manually change the
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power setting, ATPC needs to be disabled.
ATPC Max Power & Step Size
Settings for ATPC Max Power and the ATPC Step Size control how the ATPC function will
behave when attempting to achieve the TargetRSSI. ATPC Max Power is the maximum
power setting ATPC can set the power output to when trying to reach the TargetRSSI.
ATPC Step Size is the amount of dB per attempt that ATPC can change power output.

Transmitter Maximum Power Output

Maximum Transmitter power output is dependent on the band of operation and the
modulation level. Both the HP1 and HP2 ODU models have the same maximum power
levels for each band and modulation.
There is no dependency on the channel bandwidth used within a particular band. As an
example, the power level for QAM256 within the 6 GHz band is the same for 3.5 MHz
channels as it is for 56 MHz channels. The table illustrates this and shows the maximum
set power levels for each model family, band, and modulation level.
Trango Systems, Inc. GigaPlus User Manual Rev 3.1
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