Furuno FS-1570, FS-2570 manual What is DSC?, Call over Public Switched Telephone Network Pstn

3DSC 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.

Distress Frequency

Routine DSC Call

Option

(FS-2570

only)

TRANSCEIVER

UNIT

FS-1570T

FS-2570T

Distress alert, routince DSC call

Routine DSC Calls

CONTROL UNIT

FS-2570C

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
	3-1