Fault tree, 2 fault tree – Comtech EF Data SNM-1010L User Manual
Page 183
SNM-1010L Data/Control Modem
Revision 0
System Checkout
MN/SNM1010L.OM
7.2 Fault
Tree
Table 7-1. SNM-1010L Fault Tree
MODULATOR FAULTS
TX I
F
OU
TPU
T
OFF
TX FAU
LT LED
TX FAU
LT R
E
LAY
RX F
A
ULT
LED
RX F
A
ULT
RELAY
C
O
M EQ FAU
LT LED
C
O
M EQ FAU
LT R
E
LAY
TX ALARM LED
TX ALARM RELAY #2
RX ALARM LED
RX ALARM RELAY #3
SPARE RELAY ALARM #1
PRIMARY ALARM RELAY
SECONDARY ALARM RELAY
DEF
E
RRED M
A
IN ALARM
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
IF SYNTHESIZER
X
X
X
DATA CLOCK SYN
X
X
X
I CHANNEL
X
X
X
Q CHANNEL
X
X
X
AGC
X
X
X
MODEM REF ACT
X
X
MODEM REF PLL
X
X
X
X
MODULE
X
X
X
DEMODULATOR FAULTS
CARRIER DETECT
X
X
IF SYNTHESIZER
X
X
I CHANNEL
X
X
Q CHANNEL
X
X
BER THRESHOLD
X
X
MODULE
X
X
LNB
CURRENT
X
X X
Legend
Note
Fault/Alarm Relay
Test Points Connector/Pins
1
TX FAULT
JX/Pin 4 (NO), 5 (COM), 6 (NC) *
2
RX FAULT
JX/Pin 7 (NO), 8 (COM), 9 (NC) *
3
COM EQ FAULT
JX/Pin 1 (NO), 2 (COM), 3 (NC) *
4
TX ALARM #2
JX/Pin 4 (NO), 5 (COM), 6 (NC) +
5
RX ALARM #3
JX/Pin 7 (NO), 8 (COM), 9 (NC) +
6
PRIMARY ALARM
JX/Pin 43 (NO), 10 (COM), 27 (NC) +
7
SECONDARY ALARM
JX/Pin 44 (NO), 11 (COM), 28 (NC) +
8
DEF MAINT ALARM
JX/Pin 17 **
*
A connection between the common and N.C. contacts indicate fault.
**
Signal is open collector high impedance if faulted.
+
A connection between the common and N.O. contacts indicate alarm.
7–3