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1. OPERATIONAL OVERVIEW
1-10
1.3 DSC Operational Overview
Digital Selective Calling (DSC) is the global calling system adopted by the ITU-R
and IMO for selective calling of coast station and ship radio stations. The DSC
system is used for both safety and routine calling. The GMDSS requires the use
of DSC for distress alerting and safety calls.
1.3.1 LED warnings
The LED below the DISTRESS key lights continuously when the distress signal
is transmitted.
The ALARM LED blinks in red (and alarm sounds) when a distress or urgent
message is received. The LED can be extinguished and alarm silenced by
pressing the CANCEL key.
The ALARM LED blinks in green (and alarm sounds) when a message other
than distress or urgent is received. Alarm is automatically silenced two minutes
after message is received.
1.3.2 DSC operational overview
Standby display
When the FM-8800D/S is turned on, the following display appears. This display
is known as the “standby display.” This is where you will begin most operations.
INTL
Hi
RX
116
SCAN
SHIFT
AUTO ACK
WATCH CH70
LAT: 34 45' N
°
10:17 UTC
LON: 135 45' E
°
AUTO
INTL
Hi
RX SCAN
SHIFT
MANUAL ACK 1
T
SCAN
116
VOL 5 SQ 2
Standby display (Transceiver unit) Standby display (Remote handset)
(Press the down arrow key of the
remote handset to view rest of
screen.)
If you get lost in operation you can return to the standby display by pressing the
CANCEL key several times.
Note: In this manual, screen examples show the transceiver’s screens. To get
the same information on the handset screen, press down or up arrow key.