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Comtech EF Data SDM-300L3 User Manual

Page 253

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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)