Nortel Networks 400 4.0, BCM200 manual Telephony hardware components

52Chapter 2 Introducing the BCM hardware

If your system requires many IP lines or trunks, you can reduce the number of DS30 buses that are assigned to MBMs and increase the number of buses available to IP telephones. This is known as a 3/5 DS30 bus split. In this case, you only have five DS30 buses available for use by the MBMs.

Refer to “Understanding DS30 numbers” on page 109 for more information.

Warning: Changing the DS30 bus split

If you change the bus split from 2/6 (default) to 3/5 after the system is initialized, any module set to DS30 bus 7 or requiring the use of bus 7 becomes inoperable.

If you change the bus split from a 3/5 split to a 2/6 split after the system is initialized, all data is lost and all optional applications must be reinstalled and reconfigured.

Figure 25 Telephony hardware components

		“Trunk media bay modules
CTM 4	1 Aux 234	(MBMs)” on page 53
		“Station media bay modules
	DSM 16+	(MBMs)” on page 56

1	2	3	4	1	2	3	4
PowerStatus							“Specialized media bay
							modules (MBMs)” on page

Refer to “Media bay module availability” on page 351 and “FEM MBM–Norstar trunk cartridge combinations” on page 352 to determine which MBMs and which types of trunk lines are available in your location.

“Telephones and adapters” on page 72

The MBMs connect with external devices to implement various types of voice trunks and extensions. Install the MBMs in the MBM bays in the BCM200 or BCM400 main units and the BCM expansion unit.

MBMs have LEDs on the faceplate. For information on MBM LEDs, see “Viewing the BCM system LEDs” on page 77.

Note: Refer to “Media bay module availability” on page 351 to determine which MBMs 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 main unit or expansion unit. Some MBMs also have a cooling fan that runs off the MBM power source. Figure 26 shows the rear views of the two types of MBMs.

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