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Chapter 1 Introduction to the Business Communications Manager Platform Hardware 81
Installation and Maintenance Guide
Specialized Media Bay Modules
This section describes the modules that perform a specific job outside of the trunk and station
description. Refer to Table 12.
• The DECT (Digital Enhanced Cordless Telecommunications) module allows you to add
radio-based cordless communication devices to your Business Communications Manager in
areas where the DECT technology is available.
• The Fiber Expansion module (FEM), provides a fast way of upgrading from an existing
Norstar system simply by plugging in Norstar expansion modules to the FEM box.
Digital enhanced cordless telecommunications (DECT) media bay module
(region-specific application)
The Digital Enhanced Cordless Telecommunications (DECT) module allows radio-based cordless
handsets to access systems that are configured to accept the DECT profile. The module connects to
radio base stations, which receive and transmit signals to the handsets. Refer to “Mobility Services
by Region” on page 303 to determine the profiles that can use the DECT protocol.
Figure 46 shows a front view of the module. The DECT media bay module has eight RJ45 jacks
that connect to base stations deployed around the coverage area. Each DECT module supports four
ISDN lines and allows a maximum of eight simultaneous call paths back to the Business
Communications Manager. The DECT module LEDs indicate module power, status, run state and
base station power state. The figure also shows the location of the DIP switches on the DECT
module. Refer to “DECT switch settings” on page 343 for the switch settings required for the
module.
Table 12 Specialized modules
Module type What it does Special notes
DECT
“Digital enhanced
cordless
telecommunications
(DECT) media bay
module”
connects a maximum of eight radio base stations
which receives transmissions from registered
cordless handsets (a maximum of 32).
Refer to “Mobility Services by Region”
on page 303.
FEM
“Fiber expansion
media bay module
(FEM)”
connects a maximum of six Norstar expansion
modules
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
media bay modules.
DDIM
“Digital Drop & Insert
MUX (DDIM)”
enables a Business Communications Manager
system to share its connection to a Universal T1
network with a LAN