Select: Monitor Menu Branch; Monitor: Live-Alarms - Comtech EF Data CDM-625A Installation And Operation Manual

CDM-625A Advanced Satellite Modem
Front Panel Operation

6.2.3 SELECT: Monitor Menu Branch

Monitor: Live-Alarms Stored-Events ACM
Stats Rx-Params RemEbNo AUPC CnC IP ()
Use the ◄ ► arrow keys to select a parameter. Press ENTER.
6.2.3.1

Monitor: Live-Alarms

Live
Alarms
Live
Alarms
Six alarm types are available between two screens, as shown in the preceding examples. Use the
arrow keys to navigate between these read-only pages. The highest priority alarm
▲▼
currently active for each of the alarm types is as follows:
Alarm Type
Unit
Tx
(Transmit)
Unit=None
Rx=Demod Lock
BUC=None
LNB=None
Description
Power supplies (+5V, +12V, -5V, +18V, -12V) are always monitored by
PSU
an onboard supervisory IC.
Tx and Rx Synth The PLLs in the IF sections are monitored for an unlocked condition.
Calibration data stored in EEPROM is checked at power-up to verify
Power Cal
that the factory calibration has not been corrupted.
FPGA Downloads are verified to have been loaded successfully.
Hi-Stab Freq Ref
No PLL Lock – This will suppress the Tx carrier.
Module
Clock activity from the Tx terrestrial source is checked if expected. The
No Clock modem falls back to the internal SCT clock to drive the modulator if
clock activity is absent.
Alarm occurs when the terrestrial clock source differs from the
FIFO Slip
programmed data rate, or may indicate a hardware failure.
Alarm Indication Signal (all 1's) is monitored at the Tx terrestrial input if
Tx AIS
present.
A Tx alarm occurs if the power increase limit has been reached when
AUPC Level
AUPC is enabled.
Hi-Stab Freq Ref
Reference not present; unit falls back to its internal 10MHz.
Activity Fault
BUC summary alarm
May occur only if ABA is enabled.
G.703 Loss of Signal
May only occur in Clock Extension Mode.
In a CnC system where a 1:1 or 1:N redundancy switch is in use, this
PMSI Sym Clock Fail alarm indicates that the PMSI symbol clock is not being detected in the
offline unit, suggesting a possible cable fault.
Net=None
Tx=No Clock ()
6–79
MN-CDM625A
Revision 4
()