SEA 7157 Operator's Manual page 27

GMDSS CLASS A CALLS
DETAILS OF A "CLASS A" CALL
Telecommand 1 (TC1) is defined as the form of communications the receiving
station should use to respond with after receiving the call. The choices for TC1 or
responses expected are:
F3E SPX FM voice communications using simplex.
F3E DPX FM voice communications using full duplex.
F1B FEC
FSK digital communications using automatic
reception of FEC telegraphy.
F1B ARQ FSK digital communications using automatic
reception of ARQ telegraphy.
CANT DO Unable to Comply with request.
DATA FAX or MODEM data.
F1B TTY FSK digital communications using automatic
reception of TTY telegraphy.
F1B TTYR FSK digital communications using automatic
reception of TTY telegraphy - receive only.
FAX Facsimile.
NO INFO No additional information needed for response.
Additional TC1 options for Distress priority categories and Individual, Group or Phone format types:
DST ACK
All Ships format using Distress priority category to send a Distress Acknowledgment.
DST REL All Ships, Geoarea, Individl and Group format types using Distress priority category to
send a Distress Relay.
POLLING Individual and Group format types to test if a station is present or able to receive.
POSITION Individual, Group and Phone format types to retrieve a stations position.
END CALL Phone Call formats only.
Telecommand 2 (TC2) gives details to clarify the TC1 selection.
The available TC2 options when the selected
TC1 option started with "F" or NO INFO are:
NEUTRAL A non warring vessel or neutral party.
MEDICAL A medical transport vessel.
NO INFO No additional information needed for response.
The CANT DO TC1 selection has 10 TC2
options to explain why the station is unable to
comply with (cant do) a received DSC call.
NO RESN No reason given.
CONGEST The channel is congested.
BUSY Phone number is busy.
QUEUE
Queue.
BARRED Restricted from use.
NO OP No operator present.
OPUNAVL Operator is unavailable.
DISABLE
Equipment is disabled.
BADCHAN The requested channel is not valid or not
available.
BADMODE The communications mode given is not valid
or not available.
3:01
1
1=F3E SPX
3=F1B FEC
5=CANT DO
7=F1BTTYR
Method of communications for response (TC1)
3:01
1
1=F1B TTY
3=NO INFO
Method of communications for response (TC1)
3:01
1
1=NEUTRAL
3=NO INFO
Details for communications response (TC2)
3:01
1
1=NO RESN
3=BUSY
5=BARRED
7=OPUNAVL
CANT DO Telecommand 2 options (TC2)
3:01
1
1=DISABLE
3=BADMODE
CANT DO Telecommand 2 options (TC2)
22
(cont.)
47° 47N 122° 19W
A US EXAMP
2=F3E DPX
4=F1B ARQ
6=DATA
UP=MORE
47° 47N 122° 19W
US EXAMP
A
2=FAX
UP=MORE
47° 47N 122° 19W
US EXAMP
A
2=MEDICAL
47° 47N 122° 19W
US EXAMP
A
2=CONGEST
4=QUEUE
6=NO OP
UP=MORE
47° 47N 122° 19W
A US EXAMP
2=BADCHAN
UP=MORE