Comtech EF Data CDM-600/600L - Manual (Page 152)

CDM-600/600L Open Network Satellite Modem Revision 3
Automatic Uplink Power Control (AUPC) MN/CDM600L.IOM
7–2
2. The user should verify that the remote modem is correespondingly configured for EDMAC,
D&I++ or ESC++ framing.
3. Under the menu (CONFIG: TX Æ POWER), the user sets the nominal output power of the
modem. This is done by selecting the MANUAL mode, then editing the displayed TX output
power level.
4. The user will then select AUPC as the operating mode.
At this point the user will be prompted to define four key parameters: AUPC Target E
b
/N
0
;
AUPC Max Range; AUPC Alarm; and Demod Unlock.
Note: For the CDM-600L, with the addition of the External 20dB Step Attentuator Kit
(CEFD P/N KT/11202-1), functionality of the CONFIG: TX Æ POWER menu is enhanced
with MANUAL- or AUPC-LOW Power Mode controls. See Appendix J. KT/11202-1
STEP ATTENUATOR KIT (CDM-600L) for further details on this operational upgrade.
7.2.1 AUPC Target E
b
/N
0
TARGET E
b
/N
0
is value of E
b
/N
0
that the user desires to keep constant at the remote modem.
If the E
b
/N
0
exceeds this value, the AUPC control will reduce the Tx output power, but will never
drop below the nominal value set.
If the E
b
/N
0
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
7.2.2 AUPC 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
7.2.3 AUPC Alarm
The ALARM 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 – this is the default setting).
• TX ALARM (generate a TX alarm).