Axnes AS
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Page 2-1
Section 2:
Operation
The PNG system consists of one PNG Base Station and one or more handheld radios. To
make all units in the PNG system interoperable, each unit must be configured with
compatible parameters. Configuration of the PNG system will imply setting of radio
frequencies, defining groups and setting scrambling or encryption parameters.
Multiple configurations may be stored on a device to support different operational modes.
The PNG system can be preconfigured from the vendor, or the configuration may be set by
the operator’s avionics department.
Ahead of flight all units in the PNG system will be set to compatible configuration. Different
types of operation may use different configurations, due to radio frequencies, group
definitions or other parameters. During operation and in flight the configuration on the PNG
Base Station is normally not changed but may be required in some special conditions. Such
conditions may be caused by radio interference, where alternative frequencies may be
required, and an alternative configuration is selected.
The operational scenario may also require different handheld configurations to be loaded in
different phases of the operation, e.g. to change group subscriptions during the mission.
Switching between the handheld configurations is done by the handheld operator by a simple
button push.
2.1 Groups
The PNG Base Station supports organizing the communication on the wireless link into
groups. Groups are a set of audio channels on the wireless link, and a set of physical audio
interfaces on the base station. The PNG system will support 2 groups depending on the
available radio resources (channel bandwidth).
The PNG Base Station will by default have audio to and from the first group on physical
audio interface 0 and the second group on physical interface 1.
The handhelds are configured to listen (receive) to one or more groups (allowing
simultaneous listening to multiple groups). Transmit is configured to one primary group
through PTT/VOX, but it is possible to configure transmit to a secondary group through
configuration and use of the secondary PTT on the handheld.
When the PNG system is set up, one or more configurations are defined, see section 2.2
Configurations.
2.2 Configurations
Both the handhelds and the PNG Base Station use configurations to control the behavior of
the devices. They can hold several configurations, with different operational parameters. A
configuration contains a minimum of the following parameters: