AEMCA Practice Exam

Which code signifies that a communication is “busy”?

1. 10-4

2. 10-6

3. 10-8

4. 10-3

The correct answer is: 10-6

The code that signifies a communication is “busy” is 10-6. In radio communication and certain coded messaging systems, different numbers are assigned to represent specific meanings. The 10-codes are often used in various public services and emergency response scenarios to streamline communication. In this context, 10-6 specifically indicates that a unit is busy and unable to respond to calls or messages at that moment. This is particularly important in scenarios where priority and clarity in communication are necessary, as it allows others to understand that the unit is occupied and should not be contacted unless it's an emergency or urgent matter. The options that do not signify “busy” have different meanings. For example, 10-4 means “Acknowledgment” or “Message received,” which implies that communication can continue. Other codes such as 10-8 denote “In service,” indicating availability for calls, while 10-3 usually means “Stop transmitting,” which is a directive rather than a status of being busy. Thus, 10-6 is the appropriate code to indicate that the communication channel is currently busy.