Comtech EF Data SNM-1000 - Manual (Page 133)

SNM-1000 Node Control Modem Revision 3
Maintenance MN/SNM1000.IOM
5–3
Table 5-1. SNM-1000 Fault Tree
T
X
I
F
O
U
T
P
U
T
O
F
F T
X
F
A
U
L
T
R
E
L
A
Y
R
X
F
A
U
L
T
R
E
L
A
Y
F
A
U
L
T
L
E
D C
O
M
E
Q
F
A
U
L
T
R
E
L
A
Y
T
X
A
L
A
R
M
R
E
L
A
Y
#
2
R
X
A
L
A
R
M
R
E
L
A
Y
#
3
S
P
A
R
E
R
E
L
A
Y
A
L
A
R
M
#
1 P
R
I
M
A
R
Y
A
L
A
R
M
R
E
L
A
Y
S
E
C
O
N
D
A
R
Y
A
L
A
R
M
R
E
L
A
Y
I
B
S
B
A
C
K
W
A
R
D
A
L
A
R
M
D
E
F
E
R
R
E
D
M
A
I
N
A
L
A
R
M
MODULATOR FAULTS
(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 X
MODEM REF PLL X X X X
MODULE X X X X
CONFIGURATION X X X
DEMODULATOR FAULTS
CARRIER DETECT X X X X
IF SYNTHESIZER X X X X
I CHANNEL X X X X
Q CHANNEL X X X X
BER THRESHOLD X X X X
MODULE X X X X
CONFIGURATION X X
Legend
Note Fault/Alarm Relay Test Points Connector/Pins
1 TX FAULT Pin 4 (NO), 5 (COM), 6 (NC) *
2 RX FAULT Pin 7 (NO), 8 (COM), 9 (NC) *
3 COM EQ FAULT Pin 1 (NO), 2 (COM), 3 (NC) *
4 TX ALARM #2 Pin 4 (NO), 5 (COM), 6 (NC) *
5 RX ALARM #3 Pin 7 (NO), 8 (COM), 9 (NC) *
6 PRIMARY ALARM Pin 43 (NO), 10 (COM), 27 (NC) *
7 SECONDARY ALARM Pin 44 (NO), 11 (COM), 28 (NC) *
8 DEF MAINT ALARM Pin 17 **
* A connection between the common and N.O. contacts indicate no fault/alarm.
** Signal is open collector high impedance if faulted.