Instruction manual

ACU-1000 Operations Manual
Interoperability Now 4-7
4.7 Inability of Dispatcher to Gain System Control
If all system users have equal priority, the user that transmits first is in control until this person
ceases transmitting and gives someone else a chance. It may be beneficial (or absolutely
necessary) to give priority to one or two important users. Remember that an Interoperability
System is tying together entire radio systems, not just individual radios.
This can be accomplished by being able to assign either TX Priority or Dispatcher Priority to
all system interfaces. (Also called PTT Priority or COR Priority).
Normally all interfaces are set to TX Priority. This means that if two or more radios or other 4-
wire devices (for example, a dispatch console) are cross-connected, whoever talks first is in
control and no one else can be heard until this person stops talking (and releases the radio
PTT).
If one user (a dispatch console, perhaps), is set to Dispatcher (COR) Priority, an unsquelch
condition received at the Interoperability System from this console will override the other
user’s control of the system. The dispatcher’s audio will be transmitted instead, or will be
mixed with existing incoming audio from any other DSP-2 also set to COR (Dispatch) Priority.
Figure 4-3 TX Priority