Nortel Networks 400 4.0 User Manual
Chapter 2 Introducing the BCM hardware
61
BCM200/400 4.0 Installation and Maintenance Guide
Specialized media bay modules (MBMs)
This section describes the MBMs that perform a specific job outside of the trunk and station MBM
descriptions (see
descriptions (see
Fiber expansion media bay module
The fiber expansion media bay module (FEM) connects a maximum of six Norstar MBMs to the
BCM system. These connections provide a quick way to upgrade a Norstar system to a BCM
system.
BCM system. These connections provide a quick way to upgrade a Norstar system to a BCM
system.
The front bezel of the FEM has six connectors. These connections are made using fiber cables
between the FEM module and the Norstar expansion unit.
between the FEM module and the Norstar expansion unit.
shows the front of the FEM module. Each enabled port consumes one DS30 bus.
Figure 34 FEM faceplate LEDs and connectors
Digital drop and insert MUX
The digital drop and insert MUX media bay module (DDIM) enables a BCM system to share its
connection to a universal T1 network with a local area network (LAN) to provide a combination of
voice and data channels.
connection to a universal T1 network with a local area network (LAN) to provide a combination of
voice and data channels.
The DDIM:
Table 11 Specialized MBMs
Module type
What it does
Special notes
FEM
(see
Connects a maximum of six Norstar expansion
units.
units.
The switches on the FEM are used to
turn fiber ports on and off. The FEM
does not work correctly if you set these
switches using the rules used for other
MBMs.
turn fiber ports on and off. The FEM
does not work correctly if you set these
switches using the rules used for other
MBMs.
DDIM
(see
Enables a BCM system to share its connection to a
universal T1 network with a LAN.
universal T1 network with a LAN.
Front view
Port 4
Power LED
Status LED
Port 1
Port 5
Port 2
Port 6
Port 3
Power LED
Status LED
Port 1
Port 5
Port 2
Port 6
Port 3
4
5
6
3
2
1
FEM