Telephone System Installation and Maintenance Guide

42 Chapter 2 Introducing the BCM50 hardware
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Figure 8 BRIM faceplate
Global Analog Trunk Module
The Global Analog Trunk Module (GATM) provides an interface for four or eight analog public
switched telephone network lines. This module supports both pulse and tone dialing, as well as
Caller ID and Disconnect Supervision in selected markets throughout the world.
The GATM uses an RJ-21 connector as the trunk interface. Figure 9 shows the GATM faceplate
LEDs and RJ-21 connector. The module is available either in four-port (GATM4) or eight-port
(GATM8) configurations.
Figure 9 GATM faceplate
Station media bay modules
Station media bay modules connect telephones and analog telecommunication devices to the
BCM50 system.
Table 4 lists the available station media bay modules.
Table 4 Station MBMs (Sheet 1 of 2)
Module type What it does Special Notes
DSM16+
“Digital station media bay module”
DSM32+
“Digital station media bay module”
Connects a maximum of 16 digital
telephones to the BCM50 system.
Connects a maximum of 32 digital
telephones to the BCM50 system.
Refer to “System region
attributes” on page 229 for
supported regions.
4x16
Combination of a CTM4 and a DSM16
“4x16 media bay module”
Connects a maximum of four analog
public switched telephone lines to the
BCM50 system.
Also connects a maximum of 16 digital
telephones to the BCM50 system.
North America only.
Refer to “System region
attributes” on page 229 for
supported regions.