Table of Contents
Advertisement
SDM-300L3 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
I CHANNEL
Q CHANNEL
AGC
MODEM REF ACT
MODULE
CONFIGURATION
MODEM REF PLL
CARRIER DETECT
IF SYNTHESIZER
I CHANNEL
Q CHANNEL
BER THRESHOLD
MODULE
CONFIGURATION
LNB CURRENT
CURRENT
VOLTAGE
TEMPERATURE (FSK MODE ON)
PLL LOCK (FSK MODE ON)
CHECKSUM (FSK MODE ON)
T
T
T
R
R
C
X
X
X
X
X
O
M
I
F
F
F
F
F
A
A
A
A
E
U
U
U
U
Q
O
L
L
L
L
U
T
T
T
T
F
T
A
P
L
R
L
R
U
U
E
E
E
E
L
T
D
L
D
L
T
A
A
O
Y
Y
L
F
E
F
D
1
2
MODULATOR FAULTS
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
DEMODULATOR FAULTS
X
X
X
X
X
X
X
X
X
X
X
X
OUTDOOR UNIT (BUC)
F
9-1. SDM-300L F
IGURE
C
T
T
R
R
S
O
X
X
X
X
P
M
A
A
A
A
A
R
E
L
L
L
L
E
Q
A
A
A
A
R
R
R
R
R
F
M
M
M
M
E
A
L
U
L
R
L
R
A
L
E
E
E
E
Y
T
D
L
D
L
A
A
A
R
Y
Y
L
E
A
L
#
#
R
A
2
3
M
Y
#
1
3
4
5
X
X
X
X
X
X
X
X
X
X
T
AULT
REE
9–3
Revision 1
MN/SDM300L3.IOM
P
S
I
D
T
R
E
B
E
X
I
C
S
F
M
O
E
A
A
N
B
R
I
R
D
A
R
S
Y
A
C
E
R
K
D
A
Y
W
L
A
M
A
A
R
A
R
L
D
I
M
A
N
R
A
R
M
L
A
E
A
L
L
R
R
A
A
E
M
R
Y
L
M
A
Y
6
7
8
**
**
**
*
*
***
**
***
**
*
***
***
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
R
D
X
&
I
A
I
T
S
E
R
R
B
W
A
*
***
**
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Advertisement
Table of Contents
