Requirements

• Provide a simulated intercom model for full duplex voice communications between operators located on DIS networked nodes
• Provide an interface that links the simulation host system to the ASTi communications software model, for dynamic control of operator-intercom matrix assignments

Referring to the communications matrix in Figure 2, "Example 1": establish a link on the Main Intercom Bus between the Flight Engineer and Instructor 1.

Refer to Figure 3:

1. The simulation host sends data packets containing communications control parameters to ASTi Node 1 (Flight Engineer) and Node 2 (Instructor 1). Model Builder software extracts control parameters and sets the virtual intercom channel assignments for both operators to Main Intercom.
   
   
2. The Flight Engineer activates his PTT and transmits analog voice to the RIU.
   
   
3. The RIU converts the voice stream into a digital TDM stream. The TDM digital signal processor (DSP) receives the stream. Model Builder links the voice stream to the Main Intercom.
   
   
4. Model Builder transmits Main Intercom channel voice packets onto the local DIS network.
   
   
5. Operator Node 2 receives DIS voice packets. Model Builder links the voice stream to the Main Intercom.
   
   
6. Model Builder distributes the digital audio to the TDM and RIU. The RIU converts the digital TDM voice stream into analog waveforms for distribution to Instructor 1 headset.