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SNM-1001L Satellite Modem
Fault Isolation
9.1.3.1
Faults Tree
Refer to Figure 9-1 for faults monitored by the modem, and the action taken at each
occurrence of that fault.
IF SYNTHESIZER
DATA CLOCK SYN
MODEM REF ACT
CONFIGURATION
MODEM REF PLL
CARRIER DETECT
IF SYNTHESIZER
BER THRESHOLD
CONFIGURATION
TEMPERATURE
T
T
T
X
X
X
I
F
F
F
A
A
U
U
O
L
L
U
T
T
T
P
L
R
U
E
E
T
D
L
A
O
Y
F
F
1
X
X
X
X
X
X
I CHANNEL
X
X
X
Q CHANNEL
X
X
X
AGC
X
X
X
MODULE
X
X
X
X
X
X
X
X
X
I CHANNEL
Q CHANNEL
MODULE
LNB CURRENT
CURRENT
VOLTAGE
PLL LOCK
CHECKSUM
Figure 9-1. SNM-1001L Fault Tree
R
R
C
C
T
T
X
X
O
O
X
X
M
M
F
F
A
A
A
A
E
E
L
L
U
U
Q
Q
A
A
L
L
R
R
T
T
F
F
M
M
A
A
L
R
U
U
L
R
E
E
L
L
E
E
D
L
T
T
D
L
A
A
Y
L
R
Y
E
E
D
L
#
A
2
Y
2
3
4
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
x
x
9–3
MN/SNM1001L.IOM
R
R
S
P
S
X
X
P
R
E
A
I
C
A
A
R
M
O
L
L
E
A
N
A
A
R
D
R
R
R
Y
A
M
M
E
R
L
A
Y
L
R
A
L
E
E
Y
A
A
D
L
R
L
A
A
M
A
Y
L
R
A
R
M
#
R
E
3
M
L
R
A
E
#
Y
L
1
A
Y
5
6
7
**
**
***
**
*
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Revision 1
D
E
F
E
R
R
E
D
M
A
I
N
A
L
A
R
M
8
*
X
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