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SDM-309B Satellite Modem
The Modem stores the first ten (Flt0 - Flt9) occurrences of fault status changes in each of
the six major fault categories. Each stored fault status change is stored with the time and
date of the occurrence. Stored faults may be viewed by entering the 'stFaults" level from
the 'sELECT" menu. All stored faults may be cleared by executing the "CLEAR ??
StFaults" command from the 'stFaults" level.
Stored faults are not maintained through a controller power on reset cycle. However, the
last known time is maintained in non volatile RAM and upon power up a common
equipment fault is logged (Flt0) with that time and date. On power up an additional
common equipment fault is also logged (Flt1) to indicate the power up time and date. So
on power up the power down and power up times are logged as common equipment fault
0 and common equipment fault 1.
Upon entering the 'stFaults" level use the left and right arrow keys to move between the
six fault groups and the "CLEAR ?? StFaults" selections. The time and date of the first
stored faults status (Flt0) for the selected group will be displayed alternately on line two
of the display. Use the up and down arrow keys to cycle through the selected group's
stored faults status (Flt0 - Flt9). To display the faults status associated with the displayed
time and date press the "Enter" key, at this time you can use the right and left arrow keys
to move the flashing cursor to the fault you wish to identify.
To clear the stored faults currently logged simply press the "Enter" key when the
"CLEAR ?? StFaults" selection is displayed.
Note: Faults are stored in time sequence with the oldest faults status change stored in
Flt0 and the most recent in Flt9. Only the first ten faults status changes are stored and all
stored faults which have not been used indicate "No Fault" on the display.
3.2.6 Utility
The utility functions provide a means to set the time and date of the modem real time
clock circuit. Provisions are also made for assigning data and code rates to the modulator
and demodulator. A lamp test function is provided for testing of the front panel optical
indicators.
After entering the "UTILITY" functions level use the right and left arrow keys to select
the utility function of interest. The current time and date can be displayed and changed as
required. Access to the transmitter and receiver Data/Code Rate assignment and the lamp
test functions are also available from within the utility functions level.
Note: The selection of data/code rates in the "UTILITY" program must match the
hardware filters installed on the modulator and demodulator modules.
The utility functions are as follows:
MN/U-SDM309B Rev. #
Operation
3–37
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