Comtech EF Data CDM-550T - Manual (Page 106)

CDM-550T Satellite Modem Revision 3
Automatic Uplink Power Control (AUPC) MN/CDM500T.IOM
4) The user will then select AUPC as the operating mode. At this point the user will be
prompted to define four key parameters:
12.2.1 Target Eb/No
This is value of Eb/No that the user desires to keep constant at the remote modem.
• If the Eb/No exceeds this value, the AUPC control will reduce the TX output power, but
will never drop below the nominal value set.
• If the Eb/No falls below this value, the AUPC control will increase the TX output power,
but will never exceed the value determined by the parameter MAX RANGE.
The minimum value the user can enter is: 0.0 dB
The maximum value the user can enter is: 9.9 dB
The default value is: 3.0 dB
The resolution is: 0.1 dB
12.2.2 Max Range
This defines how much the modem is permitted to increase the output level, under AUPC control.
The minimum value the user can enter is: 0.0 dB
The maximum value the user can enter is: 9.0 dB
The default value is: 1.0 dB
The resolution is: 1.0 dB
12.2.3 Alarm
This parameter defines how the user wants the modem to act if, under AUPC control, the
maximum power limit is reached.
The two choices are:
• NONE (no action)
• TX ALARM (generate a TX alarm)
The default setting is NONE.
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