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CDM-600 Satellite Modem Revision 7
Automatic Uplink Power Control (AUPC) MN/CDM600.IOM
12–2
12.2 Setting AUPC Parameters
1) The user, under the menu (CONFIG, MODE) first ensures that EDMAC is
selected. EDMAC may be selected as IDLE, or the unit may be defined as an
EDMAC Master or Slave. The important consideration is that EDMAC framing
should be enabled.
2) The user should verify that the remote modem also has EDMAC framing
enabled.
3) The user, under the menu (CONFIG, TX, POWER) sets the nominal output
power of the modem. This is done by selecting the MANUAL mode, then editing
the TX output power level displayed.
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 dB
• The maximum value the user can enter is 9 dB
• The default value is 1 dB
• The resolution is 1 dB