Comtech EF Data SDM-2020, Installation And Operation Manual

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Operation SDM-2020 Satellite Demodulator
3–30 Rev. 3
3.3.4 Stored Faults/Alarms Menus
Refer to Figure 3-10.
The demodulator stores the first 10 (Flt0 through Flt9) occurrences of fault status
changes in each of the four major fault categories. Each fault status change is stored with
the time and date of the occurrence. Stored faults may be viewed by entering the Stored
Faults level from the Function Select menu.
All stored faults may be cleared by executing the CLEAR Stored Faults?? command
from the Stored Faults 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-down, 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. 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 Stored Faults level, press [
←
] or [
→
] to move between the fault
groups and the CLEAR Stored Faults?? selections. The time and date of the first stored
fault status (Flt0) for the selected group will be displayed alternately on line 2 of the
display.
Press [
↑
] or [
↓
] to cycle through the selected group’s stored fault status (Flt0 through
Flt9). To display the fault status associated with the displayed time and date, press
[ENTER]. At this time, press [
←
] or [
→
] to move the flashing cursor to the fault to be
identified.
To clear the stored faults currently logged, simply press [ENTER] when the CLEAR
Stored Faults/YES?? selection is displayed, press [ENTER] again to clear.
Note: Faults are stored in time sequence, with the oldest fault status change stored in
Flt0, and the most recent in Flt9. Only the first 10 fault status changes are stored,
additional faults are ignored until the log is cleared. All stored faults, which have not
been used, indicate No Fault on the display.
3.3.4.1 Unavailable Seconds Fault
UNAVAIL SECONDS
X
Note: This is available only with the
Reed-Solomon option.
A fault is indicated if there are any errors the Reed-Solomon
Codec could not correct during a 1 second interval.
X indicates the number of occurrences, up to a maximum of 9.
If X = 3, then there were 3 seconds with uncorrectable errors.