The DDS 5900 has four modes of operation: Auto; Manual; FIFO; and Vox. Please describe each.
Auto: The delegate (talker) can activate the microphone immediately by touching the "SPEAK" button on the DC5980P conference unit. A red LED next to "SPEAK" will illuminate, as will the red LED ring near the tip of the GM gooseneck microphone. Touch the "SPEAK" button again to deactivate the microphone.
Manual: The chairman must activate a specific microphone based upon a "request to speak" list. A delegate requests to speak by touching the "SPEAK" button. A green LED illuminates on the delegate's DC5980P conference unit to confirm that the request has been added to the queue. (Cancel "request to speak" by touching the "SPEAK" button again.) The chairman selects the next delegate to speak from the queue. The queue is viewed/controlled by using a control system (such as AMX or Crestron), or by using a web browser interface on a PC or an iPad. Once the chairman has activated a mic, the delegate LED changes from green to red. The delegate can touch the "SPEAK" button to deactivate the mic.
FIFO: First In - First Out. The first delegate to touch the "SPEAK" button will activate the microphone. If other delegates touch their "SPEAK" button while the first delegate is talking, they are added to the FIFO queue. The green "REQUEST" LED will illuminate for all delegates in the FIFO queue. When a delegate will be the next to speak, the green LED will begin to slowly flash on/off.
VOX: Voice Activation Mode. A delegate microphone is activated whenever she speaks (or touches the "SPEAK" button.) Once the delegate stops speaking, the microphone is deactivated after 4 seconds; this time can be adjusted from 1 second to 10 seconds. There is also an adjustment for the activation threshold; the range is -12 to +8 with the default setting of 0. Setting the threshold to a number less than 0 makes the mic activate with softer sounds.
NOTE: The DDS 5900 system can allow a total of up to eight active speaker (delegate) microphones at a time. The "Max speakers:Total" parameter can be adjusted to allow a smaller total. In addition, the "Max speakers:Delegates" parameter can be adjusted to allow an equal or lesser number of active delegate microphones. If delegate microphones beyond the "Max speakers:Delegates" value are attempted to be activated, those "request to speak" entries are placed sequentially into a queue. The size of the "request to speak" queue can be specified by the "Max requests" parameter.
A chairman microphone always has precedence over a delegate microphone. If activating a chairman microphone exceeds the "Max speakers:Total" value, then the earliest activated delegate microphone will be turned off. If the "Max speakers:Total" value is greater than the "Max speakers:Delegate" value, then the chairman microphone can activate without overriding any delegate microphones.