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SDM-100A Satellite Modem
The ASYNC interface PCB also provides its own Doppler buffer, which has a maximum
depth of 32 ms at the highest terrestrial data rate. Buffer fill status can be checked in the
monitor menu on the front panel of the modem. Depth selection and centering of the
buffer are provided in the CONFIG INTERFACE menu.
The AUPC function allows each of two modems that are in a closed link to control the
output of the other modem. In order for this feature to function, both modems must have
their AUPC options enabled. These options are:
AUPC Enable
Nominal Power
Minimum Power
Maximum Power
Target Noise
Tracking Rate
Local CL Action
Remote CL Action
With AUPC enabled on both modems A and B, as in the above illustration, if modem A
loses carrier:
1. Modem A will set its output power as specified by Local CL Action. This will be
2. Modem A will then send a "lost carrier" command to modem B.
3. Modem B will set its output power as specified by its Remote CL Action. This
Rev. 0
Enables the AUPC to function locally.
Output power level. Can be used for problem conditions, if chosen.
Sets minimum output power to be used.
Sets maximum output power to be used.
Desired E
Sets speed at which modems will adjust to output power.
Defines action that local modem will take if it loses carrier
(Maximum, Minimum, or Hold).
Defines action that local modem will take if remote modem reports
carrier loss (Maximum, Minimum, or Hold).
MODEM A
Maximum, Minimum, or Hold.
will either be Maximum, Minimum, or Hold.
/N
of the local modem.
b
0
LINK
MODEM B
Options
B–3
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