Pliant Technologies <b>CCU-22</b> 2-plus-2, 1RU Control Unit, establishes a CrewNet-based infrastructure allowing for system-wide access, control and monitoring of any active CrewCom device, and provides external connectivity via two 2-Wire and two 4-Wire ports simultaneously. (Device does not include a radio; a Radio Transceiver is required for wireless communication with Radio Packs.)</p>