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SDM-2020 Satellite Demodulator
3.3.3.2
Configuration Faults Menu
Refer to Figure 3-9.
Fault/Alarm
CONFIGURATION
JUMPER POSITION
LOOPBACK STATE
RX INTERFACE
RX DATA RATE
RX SYMBOL RATE
RX IF FREQUENCY
DBS MODE
SERIAL MODE
PARALLEL MODE
FRAMING TYPE
Rev. 3
Possible Problem and Action
Demodulator configuration fault. Indicates the demodulator module or
interface does not support a programmed configuration parameter. This
fault typically occurs when the programmed configuration is not supported
by the module hardware.
Pressing [ENTER] with the cursor on the configuration parameter will
display a second menu called "DMD PROGRAMMING." Pressing
[ENTER] again will display the possible fault combinations to make it
easier to determine which incompatibilities exist.
This fault indicates an invalid state. Usually, the jumper position is
incorrect.
This fault indicates an invalid state. Usually, the loopback position is
incorrect.
Normally this fault will appear with other programming faults to indicate
that a particular programming parameter is not valid for that particular
interface.
If this fault appears alone, this would usually indicate that the
demodulator maximum data rate was exceeded. Refer to Tables 1-1, 1-2,
and 1-3, to analyze and reprogram the data rate. If this fault appears with
other faults, the combination of faults should help determine which
parameters are programmed incorrectly.
The demodulator's Symbol Rate has been exceeded, or is too low.
This fault indicates that the IF frequency is out of the demodulator's
specification range. Refer to the MAXIMUM and MINIMUM IF
frequency range and readjust the IF frequency.
Will usually be faulted with other programming faults. DBS mode
requires a 204 framing type and requires the data clock to be in Serial
Mode. Correct the appropriate fault and re-enter.
Will usually fault when the data rate is exceeded for a particular
interface in Serial Mode. Check the combination of faults and determine
the best operating parameter. Correct and reprogram.
Will fault when parallel mode is not a compatible parameter with
another selected parameter. Determine the correct course of action and
reprogram.
This fault will usually occur in combination with DBS mode. Other
faults may also be present. See DBS mode above. Check combination of
faults, correct and reprogram.
Operation
3–25
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