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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.