Business Communications Manager 200 and 400   Business Communications Manager (BCM) 400 is an IP-based system integrating voice and data functionality into a single platform for small and medium sized business as well as multi-site and branch offices. BCM now offers enhancements in the areas of core telephony, IP telephony, applications, data, management, and serviceability to improve productivity, customer service, and overall simplicity of the BCM solution. Key Features: Cost-effective scalability from 10 to 200+ stations using a mix of digital and IP stations. Simplified network infrastructure cuts costs by connecting IP phones over the LAN wiring system, seamlessly extending features to multiple sites through IP connectivity and streamlining network management. IP trunking enables a business to optimize network bandwidth and reduce network costs. Redundancy options, including power, fans and hard-drive, automatically detect failures and switches over seamlessly without any loss of service. This optional feature provides protection where security and reliability are the key drivers to communications systems. Browser-based management simplifies installations, and provides an intuitive, wizards-based method of managing the network from any Web-enabled workstation. Unparalleled telephony features - with the most complete telephony feature offering for small sites, no business has to make compromises on how to process critical customer calls. Full suite of applications - including voice messaging, unified messaging, interactive voice response, multimedia call center and wireless, enable your business to streamline costs, be more productive, and better serve customers. The Nortel BCM Expansion Cabinet houses an additional six bays for Media Bay Modules, excluding the DTI or DDIM. It also contains a cooling fan, a power supply and a hub card. The hub card is an interface card mounted on the inside of the BCM Expansion Cabinet. The hub card provides a connection between the MSC and the Media Bay Modules. Inside the Expansion Cabinet are the following connectors: One RJ-45 connector for the interface to the MSC Six DS256 module connectors.  This expansion cabinet works only with the Nortel BCM400. The BCM 200 provides two bays for Media Bay Modules. The BCM 200 has a lower removable tray, similar to that in the BCM 400, for improved serviceability of the platform in a lower-cost version. The BCM 200 cannot be expanded using an Expansion Cabinet. The lower cost Nortel BCM 200 version meets the needs of price-sensitive smaller sites. For customers with 10 to 30 users per system who do not expect to grow past 32 users per system.