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SNM-1001L Satellite Modem
Burst Mode Modulator Operation
TX CLK PLL
TX CLK ACTIVITY
****
*****
T
X
I
F
O
U
T
P
U
T
O
F
F
TX INTERFACE
FAULTS
X
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.
Figure C-1. SNM-1001L Burst Mode Fault Tree (Continued)
T
T
R
R
C
C
X
X
X
X
O
O
M
M
F
F
F
F
A
A
A
A
E
E
U
U
U
U
Q
Q
L
L
L
L
T
T
T
T
F
F
A
A
L
R
L
R
U
U
E
E
E
E
L
L
D
L
D
L
T
T
A
A
Y
Y
L
R
E
E
D
L
A
Y
(1)
(2)
(3)
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–14
Revision 1
MN/SNM1001L.OM
T
T
R
R
S
X
X
X
X
P
A
A
A
A
A
R
L
L
L
L
E
A
A
A
A
R
R
R
R
R
M
M
M
M
E
L
L
R
L
R
A
E
E
E
E
Y
D
L
D
L
A
A
A
Y
Y
L
A
#
#
R
2
3
M
#
1
(4)
(5)
X
X
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