Motorola MOTOTRBO SYSTEM PLANNER Specifications Page 29

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20 System Feature Overview
November, 2008
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.
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 143 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 143 of this document.
2.3.1.2 Private Calls
MOTOTRBO provides the capability for a user to place a Private Call (also known as an “Individual
Call”) directly to another radio, even if they are not in the same group. However, for this action to
take place both radios need to be on the same channel and time slot. This feature allows a radio
user to carry a one-to-one conversation that is only heard by the two parties involved. For
example, an employee may use a Private Call to privately alert a specific manager about a
security incident, rather than placing a Group Call that would be heard by the whole group. Though
Private Calls utilize the signaling capabilities in MOTOTRBO systems to govern which radios are
allowed to participate, the use of a Private Call does not necessarily imply the use of encryption or
scrambling.
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