The TS-900 is a Central unit of the Infrared Conference system. Since the system is cordless, it can be easily installed and removed based on a free layout. Connecting the TS-900 to the Transmitter/Receiver units permits control of the conference units. It features control function from a PC (The control software is not attached.), installation confirmation function that confirms the connection status for the Transmitter/Receiver units and installation status for the conference units, and voting function that computes and displays the voting result. Since two speech outputs are provided (Main and Sub channels), it is ideal for use in simultaneous interpreting conference. With the use of an optional rack mounting bracket, it can be mounted in an EIA Standard equipment rack (4 unit size).