Nortel Networks BCM50 manual Media bay modules, Expansion unit Main unit

Chapter 2 Introducing the BCM50 hardware 39

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.

Warning: Make sure the power supply to the expansion unit is disconnected before inserting or removing a media bay module (MBM).

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

Expansion unit 1 Main unit Expansion unit 2

Buses 5/6

Buses 7/8

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.

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.

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.

BCM50 Installation and Maintenance Guide