SLM-3650 Satellite Modem
Revision 3
Options
MN/SLM3650.IOM
A–21
A.1.4.1 Local
AUPC
The AUPC function allows each of two modems in a closed link to control the output of
the other modem. Both modems must have the AUPC options enabled. These options are:
AUPC ENABLE
Enables the AUPC to function locally.
NOMINAL POWER
Output power level. Can be used for problem conditions, if chosen.
MINIMUM POWER
Sets minimum output power to be used.
MAXIMUM POWER
Sets maximum output power to be used.
TARGET NOISE
Desired Eb/N0 of the local modem.
TRACKING RATE
Sets speed at which modems will adjust to output power.
LOCAL CL ACTION
Defines action that local modem will take if it loses carrier (Maximum, Minimum, or Hold).
REMOTE CL ACTION
Defines action that local modem will take if remote modem reports carrier loss (Maximum,
Minimum, or Hold).
LINK
MODEM A
MODEM B
With AUPC enabled on both modems (A and B), if modem A loses carrier:
1. Modem A sets its output power (MAXIMUM, MINIMUM, OR HOLD) as
specified by LOCAL CL ACTION.
2. Modem A then sends a “lost carrier” command to modem B.
3. Modem B sets its output power (MAXIMUM, MINIMUM, OR HOLD) as
specified by REMOTE CL ACTION.
4. Once modem A has reacquired the carrier, it sends commands to modem B to
achieve the desired E
b
/N
0
. During this time, modem B sends commands to
modem A to increase or decrease power to maintain modem B’s target E
b
/N
0
.
Notes:
1. Local carrier loss always takes priority over remote carrier loss.
2. The RX AUPC link is dead when the carrier is lost.
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