The IS-CCU allows a connection of up to four door / sub stations and up to four master stations. It features inputs for up to two ISSCU, four IS-RCU, and one IS-IPC to expand the system using CAT-5e/6 cable. The ISCCU has four public address outputs, eight contact outputs, two video BNC outputs, four contact inputs and two chime inputs each with individual volume control. 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.