Subject: Coference System specification Portable, easy to use conference system for meetings and discussions with up to 30 participants Features  - Simple installation and operation - Single cable conference system with std Minicon connectors - Daisy chain connections from one console to the next, chairperson and delegate consoles can be connected in any order - Integrated loudspeakers in the consoles - Additional headphones output with adjustable volume in each console - Manual operation with PTT (push and talk) button - Microprocessor-controlled - Gooseneck microphone with integrated LED light ring to indicate live microphone - Easy menu-guided settings from the chairmans consoles - Scratch-resistant surface - Link to external Pas, mixers, etc. Through balanced XLR output and unbalanced RCA outputs - Flexible audio input configuration - Serial interface for connection to room control systems - Integrated compressor for consistent volume - ability to connect to Telco facilities - Input and output connections should be balanced XLR/% sockets Components  - Power supply unit - Chairman console - Delegate console - Bus cable - Power line cable - Floor-X adapter - CD recorder Description  3.1 Power Supply Unit The power supply unit supplies the consoles with power and serves as an interface to external devices. Supply Voltage 220 Vac, 50Hz There should be a Power LED to indicate power on.  Power socket to integrate fuse Daisy chain socket Minicon socket to connect the console via bus cables.  The sockets are interchangeable; Either one may be used as an input or an output Audio; Input and output There should be an ON/OFF button to activate the audio input and output on the rear of the unit and a level of control switch for both the input and output signal. A digital meter for monitoring signal level, input and output.  Microphone to audio output; Frequency range: 100Hz-15 kHz Provide auxiliary input/output signal via RCA connectors.  There should be a microphone/line switch, with ability for phantom power for condenser microphones. Phantom power should be switchable through all the available ranges.  Audio input to audio output; Frequency range: 50Hz-18 kHz Monitor section Quarter headphone (output impedance of 8 Ohms) output with volume control. Switchable for monitoring input and output audio. The console speaker switches off when you connect headphones.  The chairpersons console should have a PRIORITY button that overrides other microphones.