half duplex
A system that only allows the transmission of a radio
signal in either direction, but not simultaneously.
Meaning, only one person can speak and one (or more)
people can listen at any given time. The majority of two-
way radios only provide half duplex communication.
haptic, haptics
Haptic technology, haptics, or kinesthetic communication,
is tactile feedback technology which recreates the sense of
touch by applying forces, vibrations, or motions to the
user.
Home Network
The network in which a radio subscriber ID (ITSI) is
provisioned, containing the Authentication Centre for that
subscriber. The MNI of the ITSI is the same as the MNI
of the Home Network.
Home Network Mode
Operating mode using Multiple Home Network (MHN)
signalling. All configured networks are considered as
Home Networks. Does not require a licence for Air
Interface Migration (AIM).
ISSI
Individual Short Subscriber Identity. sf. (T)
keypad lock
a) A function on a device, such as a mobile phone or
computer, that prevents a user accidentally activating
functions using the keypad or to prevent access to the
functions for security reasons.
Lone Worker
A operating function of a radio, associated with a user
profile, that allows a user working alone to indicate that
they are safe. When the user selects the Lone Worker
profile, the radio will periodically emit an audible alert.
Each time the user hears the alert he or she must press a
key on the keypad to prevent an alert being triggered. If
no key is pressed within a given time, the radio will send
an Emergency Status message will to a customised
location, for example to the Dispatcher. It can be
configured to send an emergency call or GPS co-
ordinates if an emergency situation is detected. See also
User Profiles.
Man-Down
A operating function of a radio, associated with a user
profile, that initiates an emergency signal when the radio
is tilted at a nominated angle for a set duration of time.
An active, smart personnel monitoring system, Man-
Down checks for abnormal lack of motion and raises an
emergency call or sends an Emergency Status message if
the user becomes incapacitated. It can be configured to
send an emergency call or GPS co-ordinates if an
emergency situation is detected. See also User Profiles.
Migration Mode
Operating mode using Air Interface Migration signalling.
Some aspects of behaviour are different when the radio is
registered on a Visited Network rather than the Home
Network. Requires a valid licence for Air Interface
Migration (AIM). (S)
Mode key
A key on a PowerTrunk radio or mobile that activates
various functions when pressed or when pressed together
with the Navi-knob or Navi-keys. (S)
navigation keys
Four arrow keys (Left, Right, Up And Down ) on a
PowerTrunk radio that allows users to choose menu
options and navigate through the menus. The keys are
located above the keypad. (S)
Navi-knob
A continuous rotating knob on a PowerTrunk TETRA
radio that allows the user to change talkgroups, select
status messages, as well as controlling the speaker
volume. (S)
keypad
A set of buttons arranged in a block or pad that have
either digits, symbols or alphabetical characters on, or a
combination of all of these. Do not use key mat,
keyboard, or alphanumeric keypad.
PABX
Public Automatic Branch eXchange. sf.
picture message
A small JPEG image file with an accompanying text
message sent to recipients over the TETRA Air Interface.
(S)
point-to-point call
A half duplex call made to a contact on the network using
the PTT button. Unlike a group call, a point-to-point call is
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