Comtech EF Data CDM-625, Инструкция по установке и эксплуатации

Страница: 120 / 322

CDM-625 Advanced Satellite Modem Revision 1
Front Panel Operation MN-0000036 (Ref MN/CDM625.IOM)
5.6 SELECT: Monitor
Monitor: Live-Alarms Stored-Events
Statistics Rx-Params AUPC CnC IP (
34
)
Select the parameter to monitor using the ◄ ► arrow keys, then press
ENTER
.
5.6.1 Monitor: Live-Alarms
Live Unit=None Net=None
Alarms Rx=Demod Lock Tx=No Clock (
v
)
Note the arrows
: view additional information by pressing the ▲ ▼ arrow keys.
Live BUC=None
Alarms LNB=None (
v
)
An example of an Alarm screen is shown. The
highest
priority alarm currently active for each of
the
six
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 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
Activity Fault – reference not present; unit falls back to its internal
10MHz.
BUC summary
alarm (may occur only if ABA enabled)
G.703 Loss of Signal
(may only occur in Clock Extension Mode)
5–48