Glossary  91
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.