User's Manual

132 Glossary
RF Radio Frequency, the part of the
electromagnetic spectrum that is suitable for
radio transmissions. The frequency of the RF
signal is described in terms of the number of
cycles per second or Hertz
(Hz).
RSSI Received Signal Strength Indicator, an icon or
number that shows the strength of a received
signal.
T
traffic channel The traffic channel is the channel on a
trunking system to which the parties
participating in a call are directed to for the
duration of the call. When the call ends, the
traffic channel is returned to the pool of
channels for use in a new call.
trunking
operation
In trunking operation, the trunking system
manages the communications channels used
by the radio, and shares a number of channels
among a large number of radio users.
V
valid signal A valid signal is a signal that the radio
responds to by unmuting the receiver.
A
signal may be valid, for example, when it is
stronger than a minimum level or has special
signaling that matches the signaling
programmed for the receiving radio.