Chapter 2: Operation
DSC calls
29
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Oper
ati
o
n
Sessions in the MF/HF radio
What is a session?
A DSC session is defined as a collection of DSC calls (transmitted and/or
received) that are related to the same event (e.g. a Distress event) or
established call (e.g. an individual call request followed by an
acknowledgement).
A session can be either
active
or
on hold
. The active session has control over
the radio transmitter. A session can have a purpose. For example if the
purpose is to establish a communication on a working channel.
The non-DSC communication (voice) is considered as a session that can be
active (engaged) or on hold (dis-engaged). See also
Engagement status
on
page 13.
Display for a session
In the lower part of the display
the type of session, the current
state, MMSI number of the
other party and lapsed time
since the reception of a call
request or an acknowledgment
is shown.
The session state icons, in the
example
and R, show the state of the session:
•
ACTIVE
— the session icon is inverted, the transmitter tuned into the
communication channel (in the example
, a DSC Routine call).
•
HOLD
— normal view, parked session (in the example
, MF/HF
voice communication.
•
FLASHING
— Call has updates that need handling or viewing.
QUIT
HOLD
MORE
GROUP RX
LINK FOR COM: 0:00:08
FROM: 219380005
6230.0
6230.0
SSB 611
kHz/Tx
kHz
RX
R
Session state
Session line
Session status
icons
