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1-1
OPERATIONAL OVERVIEW
This chapter provides an overview of the FELCOM 12 system.
The Communication Unit
The communication unit is the heart of the FELCOM 12 system, trans-
mitting and receiving messages and alerting you to equipment fault.
On its front panel you should see the POWER switch and POWER
lamp. Normally, the power is left on while underway.
POWER
FURUNO
INMARSAT- C MOBILE EARTH STATION
NAME PLATE
POWER
Switch
POWER
lamp
Figure 1-1 Communication unit IC-212
Self test
When the communication unit is turned on it conducts a series of
self-tests to check itself for proper operation.
When the audible alarm sounds
The audible alarm sounds in the following circumstances:
1) EGC distress or urgent message is received. (To silence the alarm,
press [ESC] followed by [F10].)
2) During the interval between the transmission of the distress alert
(by own vessel) and the receiving of the distress acknowledge sig-
nal from LES. (The alarm automatically stops when your ship
recives the distress acknowledge signal.)
3) The system status monitor detects equipment fault. (To silence the
alarm, press any key.)
The audible alarm sounds and the terminal unit displays which alarm
is sounding.