Comtech EF Data SDM-300L3 - Manual (Page 253)

SDM-300L3 Satellite Modem Revision 1
Fault Isolation MN/SDM300L3.IOM
9–5
Test Note Fault/Alarm Relay Test Points Connector/Pins
1 TX FAULT Pin 4 (NO), 5 (COM), 6 (NC) ****
2 RX FAULT Pin 7 (NO), 8 (COM), 9 (NC) ****
3 COM EQ FAULT Pin 1 (NO), 2 (COM), 3 (NC) ****
4 TX ALARM #2 Pin 4 (NO), 5 (COM), 6 (NC) +
5 RX ALARM #3 Pin 7 (NO), 8 (COM), 9 (NC) +
6 PRIMARY ALARM Pin 43 (NO), 10 (COM), 27 (NC) +
7 SECONDARY ALARM Pin 44 (NO), 11 (COM), 28 (NC) +
8 DEF MAINT ALARM Pin 17 *****
* IDR only.
** IBS only.
*** D&I only.
**** 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)