Comtech EF Data SDM-309B - Manual (Page 233)

External Channel Unit SDM-309B Satellite Modem
C-C–26 MN/U-SDM309B Rev. #
3.4 Stored Faults
The Modem stores the first ten (Flt0 - Flt9) occurrences of fault status changes in each of
the three major fault categories. Each stored fault status change is also 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.
3.5 Utility
Utility functions provide a means to set the time and date of the Modem real time clock
circuit. Also provisions are made for setting a BER Threshold level alarm assigning data
and code rates to the modulator and demodulator. A lamp test is available to test the
front panel indicators.
Note: The selection of data/code rates in the “UTILITY” program must match the
hardware filters installed on the modulator and demodulator modules.
Time: Set Real Clock Time The current time that the modem is set for is
displayed when selected. To set the modem time
press the “ENTER” key and use the right and left
arrow keys to position the flashing cursor over the
parameter to be changed. Use the up and down
arrow keys to change the parameter to the desired
value. Once the parameters are displayed as
desired press the “ENTER” key to set the time.
Date: Set Real Clock Date Follow the same procedure as outlined for the
time function to view and set the date.
Lamp Test: The lamp test function can be used to verify the
operation of all front panel indicators. Press the
“ENTER” key to energize all front panel indicators
for three seconds; after three seconds current
modem status will be indicated.
BERT_Set: BER Threshold Set A corrected BER Threshold may be set to indicate
a demodulator fault if the threshold is exceeded.
The current BER Threshold is displayed when
selected. Press the “ENTER” key and use the
arrow keys to select the desired BER Threshold.
When the desired Threshold is displayed at the
flashing cursor press the “ENTER” key to select it.