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This central control unit (CCU) has the following functions: it controls the telephone box of wired representative, allocates simultaneous interpretation and voting process without the operator's intervention. When used with PC, this control unit can provide more perfect meeting control function. Users can access a large number of software modules, each with specific meeting control and monitoring functions. These modules greatly improve the meeting management ability. In the event of a PC failure, the controller will switch to a separate operating mode, enabling the meeting to continue. Basic function, used to a new generation of DCN cable system, basic management functions, four phone receiver working mode: - open: speak microphone button control request (automatic) - coverage: microphone button cover has open microphone (FIFO) - voice: voice activation, press the phone talk, hold down the button to speak), open the phone number for 1 to 4, through the display screen and a single spin/button to CCU and system configuration, used for basic voting control congress voting procedure. Representatives may register "out", "in favour", "against" and "abstention". The Concentus presidential plane can start, stop and suspend voting. The voting results can be displayed on the display screen in the hall and the LCD screen of the representative machine. Through prompt, chairman tip is about to begin a new round of a vote, simultaneous interpretation, with 31 language channel and one hall language channel, to the distribution of DCN cable channel selector as many as 31 language channels and one hall language basic intercom function, Can be talk with operators and chairman can be through an interpreter (call), independent automatic camera control, the use of PC control software or increase the conference control, remote control, which can adjust the audio input sensitivity, which can adjust the audio output level, insert audio functions, used to connect to external audio processing equipment or phone coupler, installation personnel to CCU assign a unique name to identify, through the VU meter reading to monitor audio input and audio output. Can make use headphones to monitor audio, applicable to the desktop or 19-inch rack-mount chassis (2 u), portable controls and the handle of the front light, power switch, 2 x 16 characters LCD display screen, used to display state and configuration, knobs, used to browse the menu On the back, three red leds overload indicator, used to indicate a DCN network output, green and yellow LED lights, European power outlet for indicating the front of an Ethernet active interconnection ? on the back of a 3.5mm (0.14in) stereo headphone jack ? with a built-in fuse