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SDM-300A Satellite Modem
MODULATOR FAULTS
IF SYNTHESIZER
DATA CLOCK SYN
I CHANNEL
Q CHANNEL
AGC
MODEM REF ACT
MODEM REF PLL
DEMODULATOR FAULTS
CARRIER DETECT
IF SYNTHESIZER
I CHANNEL
Q CHANNEL
BER THRESHOLD
MODULE
*
**
***
****
*****
Rev. 4
Table 5-2. SDM-300A Fault Tree
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
Note
Fault/Alarm Relay
(1)
TX FAULT
(2)
RX FAULT
(3)
COM EQ FAULT
(4)
TX ALARM #2
(5)
RX ALARM #3
(6)
PRIMARY ALARM
(7)
SECONDARY ALARM
(8)
DEF MAINT ALARM
IDR only.
IBS only.
D&I only.
A connection between the common and N.O. contacts indicate no fault/alarm.
Signal is open collector high impedance if faulted.
X
X
X
X
Legend
Test Points Connector/Pins
Pin 4 (NO), 5 (COM), 6 (NC) ****
Pin 7 (NO), 8 (COM), 9 (NC) ****
Pin 1 (NO), 2 (COM), 3 (NC) ****
Pin 4 (NO), 5 (COM), 6 (NC) ****
Pin 7 (NO), 8 (COM), 9 (NC) ****
Pin 43 (NO), 10 (COM), 27 (NC) ****
Pin 44 (NO), 11 (COM), 28 (NC) ****
Pin 17 *****
Maintenance
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
X
X
5–9
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