Chapter 2: Operation
DSC calls 31
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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
acknowledgment).
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 15.
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 S, show the state of the session:
• ACTIVE — the session icon is inverted, the transmitter tuned into
the communication channel (in the example , a DSC Safety call).
• HOLD — normal view, parked session (in the example , MF/HF
voice communication).
For more information on the session state icons see Session state icons on
page 32 below.
If two identical polling or test calls are sent from the same MMSI
and the operator wants to resend a confirmation to the second
call received, put the session on hold and then activate it again.
Session state
Session line
Session status
icons
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