SLM-5650 Satellite Modem
Revision 1
Maintenance
MN/SLM5650.IOM
5–11
Table 5-2. SLM-5650 Fault Tree
T
X
I
F
O
U
T
P
U
T
O
F
F
T
X
S
T
A
T
U
S
L
E
D
T
X
F
A
U
L
T
R
E
L
A
Y
R
X
S
T
A
T
U
S
L
E
D
R
X
F
A
U
L
T
R
E
L
A
Y
U
N
I
T
S
T
A
T
U
S
L
E
D
U
N
I
T
F
A
U
L
T
R
E
L
A
Y
A
U
D
I
B
L
E
A
L
A
R
M
T
X
A
I
S
R
X
A
I
S
MODULATOR FAULTS
(1)
(2)
(3)
NONE
GREEN
MOD SYMBOL CLOCK PLL
X
RED
X
X
X
MOD SYNTHESIZER PLL
X
RED
X
X
X
MOD I/Q ACTIVITY
X
RED
X
X
X
MOD FILTER CLIPPING
X
RED
X
X
X
TX INTERFACE CLOCK PLL
RED
X
X
X
TX INTF CLOCK ACTIVITY
YELLOW
X
X
TX INTERFACE SCT PLL
RED
X
X
X
TX INTERFACE DATA AIS
YELLOW
X
DEMODULATOR FAULTS
NONE
GREEN
DEMOD CARRIER LOCK
RED
X
X
X
DEMOD DECODER LOCK
RED
X
X
X
DEMOD SYNTHESIZER PLL
RED
X
X
X
DEMOD I/Q ACTIVITY
RED
X
X
X
DEMUX
LOCK
RED
X
X X
BUFFER
RED
X
X X
BUFFER
FILL
YELLOW
X
BUFFER
OVERFLOW
YELLOW
X
BUFFER
UNDERFLOW
YELLOW
X
BUFFER PLL
RED
X
X
X
BUFFER CLK REF ACTIVITY
YELLOW
X
RX INTERFACE DATA AIS
YELLOW
X
Eb/No
THRESHOLD
YELLOW
X
Legend
Test Note
Fault/Alarm Relay
Test Points Connector/Pins
1
TX FAULT
J8/Pin 2 (NO), 1 (COM), 6 (NC) ****
2
RX FAULT
J8/Pin 5 (NO), 4 (COM), 9 (NC) ****
3
UNIT FAULT
J8/Pin 8 (NO), 7 (COM), 3 (NC) ****
****
A connection between the common and N.O. contacts indicate no fault/alarm.