Audio integrating refers to the system that connects the communication and navigation radios to the radio headsets, microphones, and loudspeakers in the aircraft.

The audio integrating system connects to the other aircraft systems through analog audio buses. The audio integrating system also connects to the VHF COM and VHF NAV systems through a digital audio bus. This digital bus transmits digital COM and NAV audio data through two isolated buses:

• The left bus connects the left side of the system to the pilot's LH COM and NAV radios
• The right bus connects the right side of the system to the copilot's RH COM and NAV radios

The audio integrating system gives a high level of failure protection. If one of the two buses fails, the system can supply the pilots with emergency COM and NAV communications through the good bus. If the two buses fail completely, the system can supply the pilots with emergency COM and NAV communications through the analog audio buses.