CDM-625 Advanced Satellite Modem
Revision 1
Automatic Uplink Power Control (AUPC)
MN-0000036 (Ref MN/CDM625.IOM)
8.2
Setting AUPC Parameters
1)
The user, under the menu
SELECT: Configuration
Æ
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
SELECT: Configuration
Æ
Tx
Æ
POWER
, sets the nominal
output power of the modem. This is done by selecting the
MANUA
L 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 –
Target Eb/No
,
Max Range
,
Alarm
, and
Demod
Unlock
.
8.2.1 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 14.9 dB
•
The default value is 3.0 dB
•
The resolution is 0.1 dB
8.2.2 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
8–2
