Comtech EF Data SNM-1001L User Manual
Page 327
SNM-1001L Satellite Modem
Revision 1
Burst Mode Modulator Operation
MN/SNM1001L.OM
C–13
MODULATOR FAULTS
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
(1)
(2)
(3)
(4)
(5)
IF SYNTHESIZER
X
X
X
DATA
CLOCK
SYN
X
X
X
AGC
X
X
X
MODEM REF ACT
X
X
MODULE
X
X
X
DEMODULATOR FAULTS
IF SYNTHESIZER
X
X
MODULE
X
X
Legend
Note
Fault/Alarm Relay
Test Points Connector/Pins
1
TX FAULT
JX/Pin 4 (NO), 5 (COM), 6 (NC) ****
2
RX FAULT
JX/Pin 7 (NO), 8 (COM), 9 (NC) ****
3
COM EQ FAULT
JX/Pin 1 (NO), 2 (COM), 3 (NC) ****
4
TX ALARM #2
JX/Pin 4 (NO), 5 (COM), 6 (NC) +
5
RX ALARM #3
JX/Pin 7 (NO), 8 (COM), 9 (NC) +
6
PRIMARY ALARM
JX/Pin 43 (NO), 10 (COM), 27 (NC)
+
7
SECONDARY ALARM
JX/Pin 44 (NO), 11 (COM), 28 (NC)
+
8
DEF MAINT ALARM
JX/Pin 17 *****
****
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 C-1. SNM-1001L Burst Mode Fault Tree