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CDM-600L Satellite Modem
Front Panel Operation
6.3.4
MONITOR
MONITOR: LIVE-ALARMS
STATISTICS
Select the parameter to Monitor using the [←][→] arrow keys, then press ENTER.
6.3.4.1
MONITOR: LIVE-ALARMS
LIVE
ALARMS
An example of an Alarm screen is shown. The highest priority alarm currently active for
each of the four alarm types is shown:
UNIT
PSU
TX and RX
SYNTH
POWER CAL
FPGA
Internal Reference
SYNTH
TRANSMIT
NO CLOCK
FIFO SLIP
TX AIS
AUPC LEVEL
Internal Reference
PLL Lock
BUC Fault
Information
RECEIVE
DEMOD LOCK
AGC ALARM
FRAME SYNC
BUFF SLIP
EbNo
BUFF CLOCK
LNB Fault
Information
RX-PARAMS
UNIT= NONE
RECV=DEMOD LOCK
Power supplies (+5V, +12V, -5V, +18V, -12V) are always monitored by an onboard
supervisory IC.
The PLLs in the IF sections are monitored for an unlocked condition.
Calibration data stored in EEPROM is checked at power up to verify that the factory
calibration has not been corrupted.
downloads (Main chain, Turbo FEC, Modem "Top" card, Mux and Demux) are verified to
have been loaded successfully.
Clock activity from the Tx terrestrial source is checked, if expected. If absent, the modem
falls back to the internal SCT clock to drive the modulator.
alarm occurs when the terrestrial clock source differs from the programmed data rate, or
may indicate a hardware failure.
Alarm Indication Signal (all 1's) present at the Tx terrestrial input is monitored.
If AUPC is enabled, a Tx alarm occurs if the power increase limit has been reached.
indicates either the demodulator or the following FEC decoder cannot lock to the incoming
signal.
is indicated if the demod signal level is >-20 or <-60 dBm.
indicates that the de-framing unit (EDMAC, IBS or IDR) or Reed-Solomon outer decoder
cannot synchronize to the data being sent to it by the demod and/or FEC decoder.
occurs when Doppler or Plesiochronous effects cause the Rx data buffer to empty or fill
completely. The results in a reset to 50%.
occurs when the monitored level drops below that programmed by the user in the
CONFIG, RX, EbNo menu.
indicates that the desired buffer reference is not present, causing the buffer to fall back on
Rx satellite timing to clock its output.
6–34
STORED-EVENTS
AUPC-PARAM
LNB
NET= NONE
XMT= NONE
Revision 2
MN/CDM600L.IOM
BUC
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