JRC JSS-2250 Instruction Manual page 24

SFEC
Selective Forward Error Correction
When broadcasting to a specific group in the
telex mode, this SFEC is used.
SOLAS Convention
International Convention for Safety of Life at
Sea
The international convention applies to all
ships engaged on international voyages. A
safety certificate is issued if the conditions of
this convention are satisfied.
SQL
Squelch
A function that acts to suppress the audio
output of a receiver in the absence of a radio
signal of sufficient strength.
● DSC terms
Address
General term for Maritime Mobile Serive
Identity number (MMSI).
This equipment uses To/From to distinguish
between the sender and receiver. It also
means the Self-ID (own ship MMSI) and
Dist-ID (MMSI of a ship in distress).
Category
Message code indicating priority of the call.
Priority levels are listed below.
・ Routine... General calls for routine work
・ Safety... Calls for safety communications
・ Urgency... Calls for urgent communications
・ Distress... Calls for distress communications
EOS (End Of Sequence)
Termination code
messages.
Other codes are listed below.
・ ACK RQ... Acknowledgement request
・ ACK BQ... Acknowledgement responding
to the ACK RQ
ECC (Error Check Character)
Error check code appended to the end of call
messages.
This is not normally displayed, but if an error
occurs on a message, an ECC error is
displayed.
Mode
Message code indicating communication
mode after a DSC call.
This equipment is fixed to radiotelephone.
xxii
appended to call
UTC
Universal Time Coordinated
VOL (Volume)
Speaker volume
WRC
World Radiocommunication Conference
WKR
Watch Keeping Receiver
The WKR is the receiver dedicated to
monitoring the
frequencies.
Radiotelephone (TEL) or ARQ and FEC
(TLX) can be used.
Nature of Distress
Message code indicating the type of distress
when a distress call is issued.
Codes are listed below.
・ Fire...
・ Flooding...
・ Collision...
・ Grounding...
・ Listing...
・ Sinking...
・ Disabled...
・ Undesignated...
・ Abandoning...
・ Piracy attack...
・ Man overboard...
Polling
Polling is a feature for routine calling.
It is used, for example, to confirm whether a
ship is within radio range when a coast
station requests navigational information of
the ship.
Reason
Message code indicating reason for negative
acknowledgement response.
Codes are listed below.
・ No reason...
・ Congestion...
distress and safety
Fire, explosion
Flooding
Collision
Grounding
Risk of ship capsizing
Sinking
Ship inoperable/adrift
Undesignated distress
Abandoning ship
Piracy/robbery attack
Man overboard
No reason
Maritime information
exchange center
congested