The IS-RCU from Aiphone is a Room Station Control Unit, Up To 30 Audio Doors/Handsets, Room Station Control Unit for the IS-CCU Central Control Unit. It allows for connection of up to thirty audio door/substations. Four IS-RCU room station control units can be added to an IS-CCU central control unit using two CAT-5e/6 cables per unit. The IS-RCU can also be connected directly to the IS-IPC IP Control Unit for applications where distances are exceeded or network connections are preferred. The IS-RCU has four public address outputs and four contact outputs. A PC is required to set up the system via a web browser. The unit can be rack mounted to an EIA standard rack (2U required) or wall mount using brackets. It is powered using an external 48V DC power supply, IS-PU-UL.