CDM-600 Satellite Modem

Revision 7

Front Panel Operation

MN/CDM600.IOM

6.3.4MONITOR

MONITOR: LIVE-ALARMS STORED-EVENTS

STATISTICS RX-PARAMS AUPC-PARAMS

Select the parameter to Monitor using the [←][→] arrow keys, then press ENTER.

MONITOR: LIVE-ALARMS

LIVE

UNIT= NONE

 

NET=

NONE

ALARMS

RECV=DEMOD

LOCK

XMT=

NONE

 

 

 

 

 

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: Power supplies (+5V, +12V, -5V, +18V, -12V) are always monitored by an

 

onboard supervisory IC.

 

TX and RX SYNTH: The PLLs in the IF sections are monitored for an unlocked

 

condition.

 

POWER CAL: Calibration data stored in EEPROM is checked at power up to verify

 

that the factory calibration has not been corrupted.

 

FPGA downloads (Main chain, Turbo FEC, Modem “Top” card, Mux and Demux) are

 

verified to have been loaded successfully.

 

Hi-Stab Freq Ref Module: No PLL Lock – This will suppress the TX carrier.

Transmit

NO CLOCK: 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.

 

FIFO SLIP: alarm occurs when the terrestrial clock source differs from the

 

programmed data rate, or may indicate a hardware failure.

 

TX AIS: Alarm Indication Signal (all 1’s) present at the Tx terrestrial input is

 

monitored.

 

AUPC LEVEL: If AUPC is enabled, a Tx alarm occurs if the power increase limit has

 

been reached.

 

Hi-Stab Freq Ref Module: Ref Activity Fault

Receive

DEMOD LOCK: indicates either the demodulator or the following FEC decoder

 

cannot lock to the incoming signal.

 

AGC ALARM: is indicated if the demod signal level is >-20 or <-60 dBm.

 

FRAME SYNC: 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.

 

BUFF SLIP: occurs when Doppler or Plesiochronous effects cause the Rx data

 

buffer to empty or fill completely. The results in a reset to 50%.

 

RX AIS: Alarm Indication Signal (all 1’s) present at the Rx satellite input is monitored.

 

EbNo ALARM: occurs when the monitored level drops below that programmed by

 

the user in the CONFIG, RX, EbNo menu.

 

BUFF CLOCK: indicates that the desired buffer reference is not present, causing the

 

buffer to fall back on Rx satellite timing to clock its output.

6–36

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Premier Mounts CDM-600 specifications Monitor LIVE-ALARMS, Live UNIT= None NET= Alarms RECV=DEMOD Lock XMT=, Unit