38 Chapter 2 Introducing the BCM50 hardwareN0027152 01N0027152 01Expansion unit and media bay modulesIn addition to a main unit, the BCM50 system can have up to two expansion units. An expansionunit connects to the main unit and provides additional functionality. Refer to Figure 4 and Table 2for expansion unit port locations and descriptions.The expansion unit is designed to accommodate one media bay module (MBM) that enables you toconnect additional telephony equipment to the BCM50 system. The MBMs connect with externaldevices to implement various types of voice trunks and stations. Refer to Table 3 on page 40 for alist of trunk MBMs and Table 4 on page 42 for a list of station MBMs that can be used with yourBCM50 system. Refer also to Table 7 on page 54 for a complete list of MBMs with links toadditional information.Ensure that the MBM dip switches are set correctly (see “Verifying the media bay module switchsettings” on page 93).Figure 4 Expansion unit connectionsTable 2 Expansion unit ports/connectors and descriptionsPort/connector DescriptionLAN port (port 1) An RJ-45 jack used to connect the customer LAN to the main unit.The LAN port on the expansion unit is connected to the internal Ethernet switch onthe main unit. You can use the expansion unit LAN port to connect an additionaldevice to the LAN.Power connector A barrel connector jack used to connect the power supply to the expansion unit.Retention clip mounting hole A small hole into which you insert the retention clip. The retention clip secures thepower connector to the unit.Expansion port An RJ-45 jack used to connect the expansion unit to the main unit.Ejector The ejector is used to remove the media bay module from the expansion unit.MBM bay A slot into which you install an MBM.Ejector ExpansionportPowerLAN portMBM bayRetention clipmounting hole
