The Sennheiser ADN CU1 Digital Central Conferencing Unit is part of Sennheiser's ADN conferencing system. Depending upon cable lengths, the device can connect up to 40 ADN microphone conferencing units via RJ45 cable. The system can be expanded even further up with to 400 microphone conferencing units by connecting 15 ADN PS power supplies into the system. The central unit can be set up as a standalone device on a flat surface or placed into a 19" rack using the optional rack ear adapters.
Once set up, the device can operate in Direct Access, Override, Push To Talk, or Request mode. In Direct Access and Override mode, any person can speak simply by pushing the microphone key button on their D1 delegate or C1 chairperson conferencing unit. In Direct Access mode, new speakers must wait for someone to stop speaking if the microphone limit for simultaneous speakers has been reached. Once someone stops speaking, the new speaker is automatically granted permission to speak. In Override mode, the new speaker can speak immediately and will override whoever has been speaking the longest.
In Push To Talk mode, new speakers will not be able to speak until the number of simultaneous speakers goes below the microphone limit, and permission will be granted to whoever pushes their microphone key button. In Request mode, a delegate presses the microphone button to join the list of people waiting to speak, and is granted permission to speak when the chairperson presses the next button on their conference unit. Depending upon the situation, you can adjust the Conference Mode, Microphone Limit, and Request To Speak limit to suit your requirements. You can also control the way time is managed, including the talk time limit for any speaker, the amount of warning before the talk time limit, and whether or not the speaker will be allowed to continue speaking or will be abruptly cut off if the talk time limit is exceeded.