Operation
SDM-300A Satellite Modem
3–40
Rev. 4
3.3.10.1 Modulator
Faults
IF SYNTHESIZER
Modulator IF synthesizer fault.
DATA CLOCK SYN
Transmit clock synthesizer fault. Indicates the internal Voltage Controlled
Oscillator (VCO) has not locked to the incoming data clock.
I CHANNEL
I channel data activity fault.
Q CHANNEL
Q channel data activity fault.
AGC LEVEL
TX IF AGC level fault.
MODEM REF ACT
MODEM REF activity alarm.
MODEM REF PLL
MODEM REF PLL not locked.
MODULE
Modulator module fault.
CONFIGURATION
Modulator configuration fault.
3.3.10.2 Demodulator
Faults
CARRIER DETECT
Carrier detect fault. Indicates the decoder is not locked.
IF SYNTHESIZER
Demodulator IF synthesizer fault. Indicates the IF synthesizer is not
locked.
I CHANNEL
I channel activity fault. Indicates a loss of activity in the I channel of the
quadrature demodulator.
Q CHANNEL
Q channel activity fault. Indicates a loss of activity in the Q channel of the
quadrature demodulator.
BER THRESHOLD
Secondary alarm result of the BER threshold set in the DEMOD
Configuration menu.
MODULE
Demodulator/decoder module fault.
CONFIGURATION
Demodulator/decoder configuration fault.
3.3.10.3
Transmit Interface Faults
TX DROP
Drop interface hardware fault. Typically indicates that the drop interface
PLL is not locked (D&I only).
TX DATA/AIS
Data or AIS. When data fault is selected in the Interface Configuration
menu, the fault indicates a data stable condition. This indicates the data
is all 1s or 0s (i.e., data is not transitioning). When AIS is selected, the
alarm indicates the data is all 1s from customer data input to the modem.
When None is selected in the Interface Configuration menu, the TX
Data/AIS Fault/Alarm is not activated.
Note: AIS is an alarm, not a switching fault.
TX CLK PLL
Transmitter phase-locked loop fault. Indicates the transmitter
Phase-Locked Loop (PLL) is not locked.
TX CLK ACTIVITY
Activity detector alarm of the selected interface transmit clock. The
interface will fall back to the internal clock when this alarm is active.
TX AUDIO 1 CLIP
IDR TX audio for channel 1 is clipped.
TX AUDIO 2 CLIP
IDR TX audio for channel 2 is clipped.
CONFIGURATION
TX interface configuration fault.
Indicates the TX interface cannot execute a programmed configuration
parameter.
Summary of Contents for SDM-300A
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Page 169: ...Theory of Operation SDM 300A Satellite Modem 4 18 Rev 4 This page is intentionally left blank...
Page 189: ...Maintenance SDM 300A Satellite Modem 5 20 Rev 4 This page is intentionally left blank...
Page 205: ...Options SDM 300A Satellite Modem A 16 Rev 4 Figure A 3 E1 Framing Formats...
Page 206: ...SDM 300A Satellite Modem Options Rev 4 A 17 Figure A 4 T1 Framing Formats...
Page 237: ...Options SDM 300A Satellite Modem A 48 Rev 4 Figure A 10 IDR Interface Block Diagram...
Page 241: ...Options SDM 300A Satellite Modem A 52 Rev 4 Figure A 11 IBS Interface Block Diagram...
Page 257: ...Options SDM 300A Satellite Modem A 68 Rev 4 CBA Figure A 19 Reed Solomon Codec Installation...
Page 265: ...Options SDM 300A Satellite Modem A 76 Rev 4 Figure A 24 8 Channel Multiplexer Installation...
Page 273: ...Options SDM 300A Satellite Modem A 84 Rev 4 Figure A 26 Flex Mux Multiplexer Installation...
Page 275: ...Options SDM 300A Satellite Modem A 86 Rev 4 This page is intentionally left blank...
Page 330: ...SDM 300A Satellite Modem Remote Control Operation Rev 4 B 55...
Page 388: ...Specifications SDM 300A Satellite Modem C 58 Rev 4 This page is intentionally left blank...
Page 392: ...Glossary SDM 300A Satellite Modem g 4 Rev 4 This page is intentionally left blank...
Page 398: ...Index SDM 300A Satellite Modem i 6 Rev 4 This page is intentionally left blank...