Features:
- Dual-channel unit providing radio data concentration, single communications management, dual audio management, and dual radio control pass-through functions
- Receives data from each radio and outputs data to other airplane systems
- Provides digital audio interface to radio sensors, the CPE, and other airplane audio sources
- Converts analog audio to digital audio format
- Dual tune paths to each onside radio
- Optional SELCAL compatible RIU analyzes the audio inputs from HF receiver/transmitter for the presence of SELCAL tones
- When SELCAL option is enabled, the RIU gives the SELCAL alerts to the crew when the SELCAL tones match the pattern assigned to the aircraft