Priority Monitor; Broadcast Call (Also Known As 'Site Wide Call'); Air Interface - Network Supported Features; Group Call Setup - Motorola MTM800 Product Information Manual

Group Call (TMO)
Talkback function selection - this determines whether or not a user is allowed to Tx on a scan
call.
2.1.13

Priority Monitor

Whilst active in a call, a terminal may receive a 'call setup' from a different group and based on call
priority, it will decide whether to ignore the new call or accept it . If the new call is of higher priority
the terminal will drop the active call and select the new call.
The terminal can be programmed to not immediately join the new higher priority call, in which case it
will display the new call to the user who then makes the descission either to accept or reject it.
Benefits:
Priority monitor adds a 3 level priority to the scanned groups – even when engaged in a call a
higher priority call is not missed.
Any TalkGroup/Announcement Talk Group can be provisioned as Priority Group.
2.1.14

Broadcast Call (Also known as 'Site Wide Call')

When a Broadcast Call is setup, it takes precedence over any call that has the same or lower
priority. It allows a console to communicate with all Terminal Users located at one or more sites. A
terminal will join the call, no matter what group ID it has selected and 'Broadcast' is displayed as the
group alias. As this type of call is receive only, the terminal prevents the user from transmitting
during the call.
Benefits:
Ensures that in a crisis you can mobilise everybody on those sites in an instant.
A wide range of groups and organizations are reachable via Site Wide Call
Can be set up as an Emergency call or Group Call with Late Entry
Easy management via SWTG (Site Wide Talk Groups)
Important that communication is confined to the target area, only the specific critical area
needs to be made aware
Important feature for Transit segment, e.g. if one or more stations need to be evacuated due
to a fire or a bomb threat
2.2

Air Interface - Network Supported Features

The following features are supported by Motorola Dimetra Networks and may not be supported by
other networks.
2.2.1

Group Call Setup

The terminal is able to make and receive group calls to and from other TETRA terminals with half-
duplex speech capability. This call type uses TETRA group call signalling with direct set-up for
incoming and outgoing calls. Group calls are owned and cleared down by the infrastructure.
Direct Setup – User requests call setup (selects address and presses PTT), gets grant by the
infrastructure (grant tone when enabled) and presses PTT to talk.
Benefits:
Instant access to selected group - within <200ms (when resources available and not queuing)
Just pressing PTT when starting communication with current selected Talk Group
September 2008
Chapter 2 - MTM800 Product Information Manual
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