Comtech EF Data SNM-1001L User Manual
Page 200
SNM-1001L Satellite Modem
Revision 1
Fault Isolation
MN/SNM1001L.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
D
E
F
E
R
R
E
D
M
A
I
N
A
L
A
R
M
1 2 3 4 5 6
**
***
7
**
***
8
*
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
SELF
TEST
X
INTERFACE
MODULE
X
X X
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. SNM-1001L Fault Tree (Continued)