Setting Aupc Parameters; Target Eb/No; Max Range - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Automatic Uplink Power Control
11.2

Setting AUPC Parameters

1) The user, under the menu (CONFIG, Frame) first ensures that Framing is selected.
EDMAC or EDMAC-2 may be selected, then the Framing mix – either AUPC-
Only or AUPC +EDMAC. 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:
11.2.1

Target Eb/No

Target Eb/No 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
11.2.2

Max Range

Max-Range 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
11–2
Revision 3
MN/CDM570L.IOM