Specifications

SDM-300L3 Satellite Modem Revision 0
Fault Isolation MN/SDM300L3.IOM
9–4
T
X
I
F
O
U
T
P
U
T
O
F
F
T
X
F
A
U
L
T
L
E
D
T
X
F
A
U
L
T
R
E
L
A
Y
R
X
F
A
U
L
T
L
E
D
R
X
F
A
U
L
T
R
E
L
A
Y
C
O
M
E
Q
F
A
U
L
T
L
E
D
C
O
M
E
Q
F
A
U
L
T
R
E
L
A
Y
T
X
A
L
A
R
M
L
E
D
T
X
A
L
A
R
M
R
E
L
A
Y
#
2
R
X
A
L
A
R
M
L
E
D
R
X
A
L
A
R
M
R
E
L
A
Y
#
3
S
P
A
R
E
R
E
L
A
Y
A
L
A
R
M
#
1
P
R
I
M
A
R
Y
A
L
A
R
M
R
E
L
A
Y
S
E
C
O
N
D
A
R
Y
A
L
A
R
M
R
E
L
A
Y
I
B
S
B
A
C
K
W
A
R
D
A
L
A
R
M
D
E
F
E
R
R
E
D
M
A
I
N
A
L
A
R
M
T
X
A
I
S
R
X
A
I
S
D
&
I
T
E
R
R
B
W
A
1 2 3 4 5 6
**
***
7
**
***
**
***
8
* *
**
***
*
**
***
***
COMMON EQUIP FAULTS
BATTERY/CLOCK X X X
-12V POWER SUPPLY X X X
+12V POWER SUPPLY X X X
+5V SUPPLY X X X
CONTROLLER X X X X X
SELF TEST X
INTERFACE MODULE X X X X X
BACKWARD ALARMS
(IDR ONLY)
BW ALARM RX #4 X X X
BW ALARM RX #3 X X X
BW ALARM RX #2 X X X
BW ALARM RX #1 X X X
BW ALARM TX #4 X X
BW ALARM TX #3 X X
BW ALARM TX #2 X X
BW ALARM TX #1 X X
Figure 9-1. SDM-300L3 Fault Tree (Continued)