Comtech EF Data C5 - Manual (Page 252)

Options C5/K1/K3 Integrated Satellite Terminal System
A–8 Rev. 0
A.2.1.1 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 E
b
/N
0
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.