Specialized Media Bay Modules (Mbms) - Nortel BCM200 Installation And Maintenance Manual

62 Chapter 2 Introducing the BCM hardware

Specialized media bay modules (MBMs)

This section describes the MBMs that perform a specific job outside of the trunk and station MBM
descriptions (see
Table 11 Specialized MBMs
Module type
FEM
(see "Fiber expansion
media bay module" on
page 62)
DDIM
(see "Digital drop and
insert MUX" on page
62)
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.
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.
Figure 35 shows the front of the FEM module. Each enabled port consumes one DS30 bus.
Figure 35 FEM faceplate LEDs and connectors
FEM
4
1
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.
The DDIM:
N0060612 N0060612
Table 11).
What it does
Connects a maximum of six Norstar expansion
units.
Enables a BCM system to share its connection to a
universal T1 network with a LAN.
5
6
2 3
Port 4
Power LED
Status LED
Port 1
Port 5
Port 2
Port 6
Port 3
Special notes
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.
Front view