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Chapter 1 Introduction to the Business Communications Manager Platform Hardware 83
Installation and Maintenance Guide
The module has port status LEDs beside each port, as well as the usual power and status LEDs.
Figure 47 shows the front of the FEM module. Each enabled port consumes one DS30 channel.
Figure 47 Fiber expansion media bay module (FEM) LEDs
Digital Drop & Insert MUX (DDIM)
The Digital Drop & Insert MUX (DDIM) module supports 1 x MUX T1 trunk with a user-defined
combination of voice and data channels. The DDI MUX enables a Business Communications
Manager system to share its connection to a Universal T1 network with a local area network
(LAN).
The DDI MUX:
• provides the functionality of a DTM media bay module (T1 digital lines only)
• splits the incoming T1 line so that some of the lines are used for voice traffic and some of the
lines are used for data traffic
• provides either the CSU (Channel Service Unit) or DSU (Data Service Unit) functionality to
support connections to data terminal equipment (DTE), such as a router or a bridge
• connects to network devices that support V.35 interfaces
• provides end-to-end transparent bit service
• supports loopbacks between the [Product Name (short)] and the internal Business
Communications Manager components, and between the [Product Name (short)] and digital
terminal equipment
Front view
Port 4
Power LED
Status LED
Port 1
Port 5
Port 2
Port 6
Port 3
4
5
6
321
FEM