ViaSat MEOLink User Manual page 33

MEOLink User Manual
Field
MODCOD Mask Properties
Modulation Codes
3.2.5.4 AUPC
Advanced Uplink Power Control (AUPC) conserves satellite power through outbound carrier
attenuation adjustments based on Es/No and link utilization. When link utilization is low and
link conditions are favorable, AUPC adds attenuation to reduce the transmit power. When
link utilization increases or link conditions become less favorable, attenuation is reduced to
increase the transmit power. When full capacity is reached, AUPC applies zero attenuation
and the MEOLink modem operates at the fully configured transmit power level, a setting
that presumably contains sufficient margin to provide the desired level of service.
It is desirable to have the update interval of AUPC much slower than that of ACM so that as
power changes, the ACM algorithm has an opportunity to run and change ModCods, thus
enhancing the effect of AUPC to settle into the configured utilization range.
The AUPC algorithm monitors the received Es/No levels of the terminals to which it
transmits, as well as the link utilization to determine the best power adjustments. The
operator may configure the AUPC parameters specified in Table 7 to customize the
algorithm.
Enabling and configuring AUPC requires two steps:
Rev 002vx
1141780,
Figure 29: ACM Configuration Screen
1. From the Configuration tab, select AUPC. From this screen, configure the AUPC
parameters with appropriate values; see Figure 30. Fortunately, AUPC can
generally be operated with default values.
Definition/Configuration
Checked modcodes are available to be used by
the system
3‐25