IN.gov - Skip Navigation

Note: This message is displayed if (1) your browser is not standards-compliant or (2) you have you disabled CSS. Read our Policies for more information.

Integrated Public Safety Commission

First Responders > SAFE-T System Terms & Definitions SAFE-T System Terms & Definitions

Affiliated Zone
The zone to which a radio is currently affiliated.

Affiliation
The process in which a subscriber unit signals to the system which talkgroup or site it is currently associated with.

Affiliation Group
The talkgroup to which a radio is currently affiliated.

Alias
An alphanumeric name used to identify a radio, talkgroup, site, etc. rather than using the assigned six-digit ID number.

Announcement Group
A collection of two or more talkgroups. Also called a multigroup.

Announcement Group call
A group call involving two or more talkgroups. Also called a multigroup call.

Announcement Group ID
Unique identifier assigned to each announcement group in a Motorola trunking system.

APCO
Association of Public Safety Communications Officers. A national organization of communications professionals that supports and promotes public safety communications concerns.

Busy Queuing
A method of queuing a call when resources are not available to grant the call.

Central Controller
Equipment at a master site or remote site that controls a set of base stations or repeaters. A central controller is typically a computer that processes inbound and outbound data traffic, assigns repeaters for voice channel access, and generally monitors and maintains order in the system.

Console
A GUI-based operator position that allows the console operators to interact with the system and communicate with radio users.

Control Channel
Communication channel implemented by a base station or repeater used to transmit and receive channel assignment data or process other control commands from the system. Contrast with a base station or repeater functioning as a voice channel used to transmit and receive voice information.

Disconnect Tone
A subaudible, 163.64 Hz tone generated by a radio when dekeying. The controller uses this tone to start the timeout timer in message trunking. In transmission trunking, receipt of the Disconnect Tone causes an immediate release of the voice channel by the controller.

Emergency Call
The highest priority service of talkgroup call. When the emergency button of a subscriber unit is pressed and the PTT pressed, an Emergency Call is granted.

Multigroup
A collection of two or more talkgroups.

Multigroup Call
A group call involving two or more talkgroups.

Remote Site
A site that consists of repeaters and a site controller, which are linked to a Master Site.

Repeater
Station at a master site or remote site that broadcasts and receives RF signals to and from mobile and portable radios in the field.

RF
Radio Frequency.

Simulcast
A wide-area trunked system configuration that uses multiple transmitter and receiver sites to extend coverage of the system. All the corresponding channel numbers at all the sites uses the same frequency.

SmartZone OmniLink
A software-based, very-wide-area radio communications network based on the interconnection of multiple SmartZone systems.

Talkgroup
A group of radio users that can share calls and messages as a group. A talkgroup comprises a group of users who have a need to communicate with each other.

Talkgroup Call
Call involving other users within the originating user's own talkgroup.

Talkgroup ID
Unique identifier assigned to each talkgroup in a Motorola trunking system.

Talkgroup Scan
A feature that allows a subscriber unit to scan those talkgroups that have an affiliated member at the scanning radio's site. The Talkgroup Scan list(s) must be programmed in the radio.

Trunking
A method of sharing a small number of communication paths among a large number of users.

Unit ID
Unique identifier assigned to each radio in a Motorola trunking system.

Users
The first responders/public safety officials operating on the Project Hoosier SAFE-T system.

Zone Controller
Handles the call processing, mobility, and some network management functions in an OmniLink system. Each zone in an OmniLink system has a Zone Controller.