Chapter 2 Introducing the BCM50 hardware 39
BCM50 Installation and Maintenance Guide
To connect an MBM to the BCM50 system, you must install the MBM in the expansion unit, then
connect the expansion unit to the main unit. See “Installing an expansion unit” on page 91 for
more information on installing a expansion unit.
The supplied Ethernet cable (shielded) connects the expansion port on the expansion unit to one of
the two expansion ports on the BCM50 main unit (see Figure 5). Expansion unit 1 is mapped to
buses 5/6 (port2), while expansion unit 2 is mapped to buses 7/8 (port 3).
Figure 5 Expansion unit and expansion connectors
The LAN port on the expansion unit is connected to the internal Ethernet switch on the main unit.
You can use the expansion unit LAN port to connect an additional device to the LAN.
Media bay modules
The media bay modules (MBM) connect with external devices to implement various types of voice
trunks and extensions. You can install one MBM in an expansion unit and you can connect up to
two expansion units to the BCM50 system.
Warning: Make sure the power supply to the expansion unit is disconnected
before inserting or removing a media bay module (MBM).
Note: When you plug an expansion unit into the correct port on the main unit, the
LEDs on the expansion unit port light up, while the LEDs on the main unit port go
out.
Note: Keycodes are required for the expansion ports to function. If you purchase a
keycode for one expansion port only, the expansion port on the left (port 2) is
active.
Expansion unit 1 Main unit Expansion unit 2
Buses 7/8
Buses 5/6
