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SDM-300L3 Satellite Modem
Fault Isolation
Test Note
*
**
***
****
*****
+
Fault/Alarm Relay
1
TX FAULT
2
RX FAULT
3
COM EQ FAULT
4
TX ALARM #2
5
RX ALARM #3
6
PRIMARY ALARM
7
SECONDARY ALARM
8
DEF MAINT ALARM
A connection between the common and N.C. contacts indicate fault.
Signal is open collector high impedance if faulted.
A connection between the common and N.O. contacts indicate alarm.
Figure 9-1. SDM-300L3 Fault Tree (Continued)
Test Points Connector/Pins
Pin 4 (NO), 5 (COM), 6 (NC) ****
Pin 7 (NO), 8 (COM), 9 (NC) ****
Pin 1 (NO), 2 (COM), 3 (NC) ****
Pin 4 (NO), 5 (COM), 6 (NC) +
Pin 7 (NO), 8 (COM), 9 (NC) +
Pin 43 (NO), 10 (COM), 27 (NC) +
Pin 44 (NO), 11 (COM), 28 (NC) +
Pin 17 *****
IDR only.
IBS only.
D&I only.
9–5
Revision 1
MN/SDM300L3.IOM
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