Setting Aupc Parameters; Max Range; Target E B /N; Alarm - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Automatic Uplink Power Control
9.2

Setting AUPC Parameters

Step Task
Under the menu (CONFIG Frame), first ensure that Framing is selected. EDMAC or
EDMAC-2 may be selected, then the Framing mix – either AUPC-Only or AUPC
1
+EDMAC. The important consideration is that EDMAC framing should be enabled.
2 Verify that the remote modem also has EDMAC framing enabled.
Under the menu (CONFIG Tx Power), set the nominal output power of the modem
3
by selecting the Manual mode, then editing the Tx output power level displayed.
4 Select AUPC as the operating mode.
At this point, the system prompts definition of four key parameters: Target E
Alarm, and Demod Unlock.
9.2.1 Target E /N
b
Target E /N is value of E
b 0
If the E /N exceeds this value, the AUPC control reduces the Tx output power, but never drops
b 0
below the nominal value set.
If the E /N falls below this value, the AUPC control will increase the Tx output power, but will
b 0
never exceed the value determined by the parameter Max-Range.
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•
•
•

9.2.2 Max Range

Max-Range defines how much the modem is permitted to increase the output level while under
AUPC control.
•
•
•
•

9.2.3 Alarm

The Alarm parameter defines how the modem acts if the maximum power limit is reached while
under AUPC control. The two choices are:
•
•
The default setting is None.
0
/N that is desired to keep constant at the remote modem.
b 0
The minimum value to enter is 0.0 dB
The maximum value to enter is 14.9 dB
The default value is 3.0 dB
The resolution is 0.1 dB
The minimum value to enter is 0 dB
The maximum value to enter is 9 dB
The default value is 1 dB
The resolution is 1 dB
None (no action)
Tx-Alarm (generate a TX alarm)
9–2
Revision 12
MN/CDM570L.IOM
/N , Max Range,
b 0