Description
Conference control without operator
Four selectable microphone modes and a test mode
Controls up to 150 contribution units
Interfaces the system with external audio equipment
Provides power for 50 contribution units
Built-in listening facilities
The Control and Power Supply Unit (CPSU) is the heart of a discussion system. This versatile unit incorporates a digital acoustic feedback suppression facility, which allows any acoustic feedback (also known as “howling”) to be automatically eliminated.

Other included features are: managing the number of active microphones and determining the operating mode, without the need for a central operator. External equipment can be connected to extend system possibilities. A built-in loudspeaker allows the conference to be monitored (to allow a stenographer, for example, to take notes on the conference).

Discussion control without operator
The CU can be setup to operate standalone without the need for an operator. The following 5 modes can be chosen using a rotary control on the unit’s top panel:

Open mode – allows selection of one to four microphones (excluded chairmen microphones) which can be simultaneously active
Open mode with auto-switch-off – allows selection of one to four microphones (excluded chairmen microphones) which can be simultaneously active. If the delegate does not speak for 30 seconds, microphones are automatically switched off
Override mode – delegates can override each other simply by activating their microphones. Only one microphone can be active at any one time. (Note: In override mode, delegates cannot override chairman)
Chairman only mode – only chairmen can speak. Delegate microphones cannot be activated, even when a chairman is not speaking
Test mode –checks if system connections are correct. All microphone light rings and contribution unit LEDs light up to indicate that units are properly connected
Supplies power for up to 50 contribution units
The CU has two trunk outputs for the loop-through connection of contribution units. It is possible to connect 25 contribution units to each trunk output, with a maximum system cable length of 100 m (109.3 yards).

Provides control for up to 150 contribution units
Up to 3 CUs can be used together in a discussion system to power and control a maximum of 150 contribution units. In this configuration a single CU acts as a master controller for the entire system.

Built-in monitor loudspeaker
The built-in monitor loudspeaker and headphone socket allow the conference to be monitored.

Interfaces the system with external equipment
The following equipment can be interfaced to the CCS 900 Ultro Discussion System through the CU:

External wired or wireless microphone – for guest speakers or audience participation. (Note: The external microphone is muted when the priority button on a chairman unit is pressed, and when the system is operating in ‘chairman only’ mode)
External PA system – for transmitting the proceedings to an audience in the same room or an adjacent room
Tape recorder – for external recording and playing back meetings and discussions
Audio equipment – for providing background music
Telephone coupler – to allow a remote delegate to participate via telephone
External audio processing – an insertion connector is provided

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