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3-1
3 DSC OVERVIEW
3.1 What is DSC?
DSC is an acronym meaning Digital Selective Calling. It is a digital distress and general
calling system in the MF and HF bands used by ships for transmitting distress alerts and
general calls and by coast stations for transmitting the associated acknowledgements.
For DSC distress and safety calling in the MF and HF bands, the frequencies are (kHz)
2187.5, 4207.5, 6312.0, 8414.5, 12577.0, and 16804.5.
The DSC station sends and receives DSC general and safety calls via the radiotelephone.
TRANSCEIVER
UNIT
FS-1570T
FS-2570T
Distress Frequency
Routine DSC Call
Routine DSC Calls
Option
(FS-2570
only)
CONTROL UNIT
FS-2570C
Distress alert, routince DSC call
3.2 DSC Call
DSC calls are roughly divided in two categories: distress and safety calls, and routine calls.
Below are the types of DSC calls.
Call Description
All Ships Call to all ships
Distress Your ship sends distress call
Distress relay all Your ship relays distress call to all ships
Distress relay select Your ship relays distress call to a coast station
Geographical Area Call to all ships in a specific geographical area
Group Call to a specific group
Individual Call to a specific address
Medical Transport Inform all ships that your ship is carrying medical supplies
Neutral Craft Inform all ships that your ship is not a participant in armed conflict
Polling
Call to determine if own ship is in communicating range with other
ship
Position
1) You send your position to other stations
2) Your ship requests position of other station
PSTN Call over Public Switched Telephone Network (PSTN)
Test Send test signal to a coast station to test your station’s functionality