Comtech EF Data SNM-1001L - Manual (Page 199)

SNM-1001L Satellite Modem Revision 1
Fault Isolation MN/SNM1001L.IOM
9–3
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.
T
X
I
F
O
U
T
P
U
T
O
F
F
T
X
F
A
U
L
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D
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A
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R
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F
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A
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C
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C
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2
R
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#
3
S
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#
1
P
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C
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1 2 3 4 5 6
**
***
7
**
**
*
8
*
IF SYNTHESIZER X X X X
DATA CLOCK SYN X X X X
I CHANNEL X X X X
Q CHANNEL X X X X
AGC X X X X
MODEM REF ACT X X
MODULE X X X X
CONFIGURATION X X X X
MODEM REF PLL X X X X
CARRIER DETECT X X X
IF SYNTHESIZER X X X
I CHANNEL X X X
Q CHANNEL X X X
BER THRESHOLD X X X X
MODULE X X X
CONFIGURATION X X X
LNB CURRENT X X X
CURRENT
VOLTAGE
TEMPERATURE
PLL LOCK x x X
CHECKSUM
Figure 9-1. SNM-1001L Fault Tree