Nortel Networks BCM200, 400 4.0 manual Choosing the assigned order for MBMs

Chapter 8 Installing a media bay module (MBM) 115

Choosing the assigned order for MBMs

Assign the MBMs and DS30 buses in the order shown in Figure 68 on page 115.

Station MBMs are assigned starting with DS30 2. This allows telephones to start numbering from the system Start DN (the default is 221).

Trunk MBMs are assigned starting at DS30 7 in a system with a 2/6 DS30 split, and at DS30 6 in a system with a 3/5 split. The exception to this is the 4x16 and the DDIM, which require two DS30 buses that must be set to a DS30 that has the next bus open.

Figure 68 Assigning single-density MBMs to the DS30 bus hierarchy

After you choose your MBMs, choose where to assign them on the DS30 buses

DS30	DN assignment
	begins with Start DN
buses
	(default: 221)
2	Station MBMs are assigned
	starting at the top (DS30 2) of
	the available MBM DS30
3	buses.

4

	Trunk MBMs are assigned
5	starting with the last
	available MBM DS30 bus
	(DS30 6 or 7, depending on
	the bus split in effect).
6	Exception: a 4x16 or a DDIM
	cannot be assigned to the
	last DS30 bus.
7*	Lines start at 61 on
	DS30 7

Example of North American- based setup

DSM 32

CTM

CTM

CTM

4x16

DS30 5 supports the station part of the 4x16

DSM 32

Example of a European- based setup

DS30 buses

2

3	DSM 32
4	DSM 16
5	BRI
6	BRI
7*	DECT

DSM 16

6

DSM

3/5 bus split

*DS30 7 is not available to any MBM if your system has been configured with a 3/5 bus split

MBMs that require two DS30 buses, such as the DSM32 and the 4x16, must be assigned to DS30s higher than 6, to accommodate all the resource requirements.

BCM200/400 4.0 Installation and Maintenance Guide