Nortel Networks BCM200 manual Specialized media bay modules MBMs, Fiber expansion media bay module

Chapter 2 Introducing the BCM hardware 61

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).

Table 11 Specialized MBMs

Module type	What it does	Special notes
FEM	Connects a maximum of six Norstar expansion	The switches on the FEM are used to
(see “Fiber expansion	units.	turn fiber ports on and off. The FEM
		does not work correctly if you set these
media bay module” on
		switches using the rules used for other
page 61)
		MBMs.
DDIM	Enables a BCM system to share its connection to a
(see “Digital drop and	universal T1 network with a LAN.
insert MUX” on page
61)

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 34 shows the front of the FEM module. Each enabled port consumes one DS30 bus.

Figure 34 FEM faceplate LEDs and connectors

FEM
4	5	6
1	2	3
	Port 4
	Power LED
	Status LED
	Port 1
	Port 5
	Port 2
	Port 6	Front view
	Port 3

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:

BCM200/400 4.0 Installation and Maintenance Guide