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SNM-1001L Satellite Modem
Burst Mode Modulator Operation
COMMON EQUIP FAULTS
BATTERY/CLOCK
-12V POWER SUPPLY
+12V POWER SUPPLY
+5V SUPPLY
CONTROLLER
INTERFACE MODULE
****
*****
+
Figure C-1. SNM-1001L Burst Modeode Fault Tree (Continued)
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.
T
T
T
R
R
C
X
X
X
X
X
O
M
I
F
F
F
F
F
A
A
A
A
E
U
U
U
U
Q
O
L
L
L
L
U
T
T
T
T
F
T
A
P
L
R
L
R
U
U
E
E
E
E
L
T
D
L
D
L
T
A
A
O
Y
Y
L
F
E
F
D
(1)
(2)
X
X
X
X
X
X
Legend
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 *****
C–15
MN/SNM1001L.OM
C
T
T
R
R
S
O
X
X
X
X
P
M
A
A
A
A
A
R
E
L
L
L
L
E
Q
A
A
A
A
R
R
R
R
R
F
M
M
M
M
E
A
L
U
L
R
L
R
A
L
E
E
E
E
Y
T
D
L
D
L
A
A
A
R
Y
Y
L
E
A
L
#
#
R
A
2
3
M
Y
#
1
(3)
(4)
(5)
X
X
X
X
X
Revision 1
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