Nortel Networks BCM50 manual Trunk MBMs, Module type What it does Special notes

40Chapter 2 Introducing the BCM50 hardware

Note: Refer to “Regional media bay module availability” on page 231 to determine which media bay modules and which types of trunk lines are available in your location.

The back of the MBM has a single connector that provides signaling channels, media channels, and power to the MBM. This connector plugs into the MBM backplane in the expansion unit. Some MBMs also have a cooling fan that runs off the MBM power source. Figure 6 shows the rear views of the two types of MBMs.

Figure 6 Media bay module connectors (rear view)

Cooling fan

Signaling, media, and

power connector

Signaling, media, and

power connector

Trunk media bay modules

Trunk media bay modules connect telecommunications lines to the BCM50 system.

Table 3 lists the types of trunk media bay modules that are available for the BCM50 system.

Table 3 Trunk MBMs

Module type	What it does	Special notes
DTM	Connects digital public switched	Can connect to one of four types of
“Digital trunk media bay module”	telephone lines to the BCM50 system.	lines: TI, North American PRI, ETSI
		ISDN (E1), and European PRI (E1).
BRIM	Connects a maximum of four ISDN BRI	Refer to “System region attributes” on
“Basic rate interface media bay	S/T interfaces.	page 229 for supported regions.
module”
GATM4/GATM8	Connects either four (GATM4) or eight	Refer to “System region attributes” on
“Global Analog Trunk Module”	(GATM8) analog public switched	page 229 for supported regions.
	telephone lines to the BCM50 system.

N0027152 01