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2. DSC OVERVIEW
2-3
2.4 Description of Call Screens
This section provides the information necessary for interpreting the receive and send
call screens.
2.4.1 RX calls
Below are sample distress relay and individual RX call screens. The contents of other
types of RX calls are similar to that of the individual call.
Distress relay
Individual RX call
Ordinary
alarm
The following sessions are received:
• Safety: all ships, individual, position, or test.
• Routine: individual, group, polling, or PSTN.
The following set is repeated:
750 Hz (50 ms) and 650 Hz
(50 ms); ten times → silent
(2000 ms); once
Ordinary
ACK
alarm
The following sessions are received then acknowledged:
• Safety: individual ACK, position ACK, test ACK.
• Routine: individual ACK.
The sessions for delayed ACK are received.
The following set is repeated:
750 Hz (50 ms) and 650 Hz
(50 ms); ten times → silent
(2000 ms); once
Self ter-
minating
alarm
• There are the related sessions for call messages.
• The related sessions for ACK messages were already
acknowledged.
• Sending the individual unable auto ACK or PSTN un-
able auto ACK.
• The following sessions are received:
relay area (duplicate), relay all (duplicate), or PSTN
end of call ACK.
1300 Hz (100 ms) → silent
(300 ms) → 1300 Hz (100 ms)
→ silent (50 ms) → 1300 Hz
(100 ms)
Alarm When Frequency (interval)
Working channel
to use
Call type
Elapsed time since
distress alert received
ID No. (MMSI)
of ship in
distress
Communication
mode and
suggested
channel
Available user options
Session in progress
Speaker icon
Position of ship
in distress
Nature of
distress
Working channel
to use
Speaker icon
Elapsed time since
call received
ID No. (MMSI)
of ship
sending this
message
Available user options
Communication
mode
Session in progress
Call type
Appears when ECC
is NG.
ACCEPT