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Recent User Priority The ability of the Motorola Central Controller to ensure uninterrupted
communications to a recent user of the Trunked system. Recent User
Priority ensures that a group engaged in a conversation will get
priority access even if there is a significant delay between
transmissions.
Repeater An electric device with transmit and receive capabilities. A repeater
will re-transmit information at 125, 70, or 35 Watts of power. A
Trunked repeater used in 800 MHz Trunking systems will typically
have transmit and receive frequencies separated by 45 MHz depending
upon the original communications system configuration.
RIB Radio Interface Box. Used to connect a computer system to a radio for
the purpose of communication between the radio and the computer.
The RIB consists of level-shifting circuits that convert the standard RS-
232 voltage levels of the computer’s asynchronous serial interface to
the single-ended voltage levels present on the Serial Bus contacts of
the radio’s feature connector. An appropriate RIB-to-radio cable and
RIB-to-computer cable must be used in conjunction with the RIB.
RS-232 An asynchronous, serial data transmission standard for computers
that defines the required sequencing, timing and hardware interface.
Scan The process by which the radio checks receive frequencies stored in a
list for activity. If activity is found, the radio is locked on that
frequency until the frequency is no longer active.
Serial Ports See “Port”.
Signalling Systems Systems used to alert radio operators or to perform specific functions
using the radio.
SMARTNET A type of Trunking system primarily used in support of public safety
and industrial communication systems. This type of system has
emergency and dynamic regrouping capabilities.
Squelch A radio circuit which eliminates noise from the loudspeaker when a
“received” signal is not present.
Synthesizer The frequency generating unit of a radio.
System Central Referred to as Central Controller, this is the heart of Motorola's
Trunking system. The Central Controller is a software controlled,
computer-driven device that receives and generates data for the
Trunked radios assigned to it. The Central Controller is responsible for
monitoring and directing the operations of the Trunked repeaters.
System ID A number assigned to a Trunked system distinguishing it from other
systems. The system ID is sent out every three seconds on the Control
Channel.
Talkaround Frequency A frequency used for simplex conversions or radio-to-radio
communications without the use of a repeater.
Talkback Indicates that a call can be answered by pressing PTT and dispatching
a response.
Talkback scan Allows the operator to respond to a call on the same channel as the call
during the talkback time in scan.
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