The Nortel Business Communications Manager BCM 450 Main Unit is the primary hardware component for the BCM system. It provides the call processing functions, connections for auxiliary equipment, and slots for Media Bay Modules.

4 slots to accommodate Media Bay Modules 1 OAM port used for direct connection of a computer running administration software such as Element Manager 2 LAN ports 2 USB 2.0 ports to connect USB storage devices 1 DS256 jack to connect a BCM expansion cabinet Auxiliary ringer jack, page relay jack, page output port Music on hold port Equipped with redundant disks (with RAID active) and redundant power supplies and fans