System Feature Overview 25
68007024085 April 2011
2.3 MOTOTRBO Digital Features
2.3.1 Digital Voice Features
2.3.1.1 Group Calls
The digital group is a way of enabling groups to share a channel without distracting and disrupting
one another. Because two-way radios are well suited for “one-to-many” types of calls, the Group
Call is the most common call in a MOTOTRBO system. Hence, the majority of conversations takes
place within a group.
The Capacity Plus system allows a radio user to leave a Group Call and start another voice or
emergency or control call (e.g. Call Alert, Radio Check, Radio Inhibit/Uninhibit, etc.) while the radio
is busy listening in to a Group Call. The radio moves to the current Rest Channel and starts a new
call on the Rest Channel. If a user starts a non-Emergency Call when all channels are busy, then
the call fails, and the radio stays on the channel.
Individual radios that need to communicate with one another are grouped together, and configured
to be members of a group. A transmitting radio can be heard by all the radios within the same
group, and on the same logical channel (frequency and time slot.) Two radios cannot hear each
other, if they are on the same logical channel (frequency and time slot) but on different groups.
Two radios on different logical channels cannot hear each other, even if they are placed in the
same group.
In MOTOTRBO systems, capabilities for Group Calls are configured with the portable and mobile
radio CPS. The repeater does not require any specific configuration for groups. Radios can be
configured to enable the user to select among multiple groups using the radio channel selector
knob or buttons, or using the radio menu contacts list. Which group a radio user hears on a given
channel depends on a configurable parameter called the RX Group List. A call preceding tone can
be provisioned to alert the target user of the incoming Group Call. This can be enabled or disabled
per Group. An introduction to configuring Group Calls and RX Group Lists is provided in “System
Design Considerations” on page 203 of this document.
Groups are defined according to the organizational structure of the end user. When planning for
groups, customers should think about:
• which members of the functional workgroups in their organization that need to talk with
one another,
• how those workgroups interact with members of other workgroups, and
• how users will collectively share the channel resources.
Greater detail on the fleetmapping process is provided in “System Design Considerations” on
page 203 of this document.
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