Determining Bus Requirements - Nortel BCM200 Installation And Maintenance Manual

Offsets are assigned using DIP switches 1, 2, and 3 on the MBM.
Note: MBMs that do not, or cannot, share DS30 buses always assign the offset as 0
(zero). As well, if the MBM requires more than one bus, such as the 4x16 or the DDIM,
only the first DS30 is set on the DIP switches. The next consecutive DS30 bus is
automatically assigned by the MBM.
Figure 66 on page 111
or eight (double density) lines each.
Note: When you enable a station MBM for double density, the line numbers double.
Figure 66 Offsets are part of DS30 channel line groups
Offsets have
4 lines (single-density)
8 lines (double-density)

Determining bus requirements

Figure 67 shows the DS30 bus requirements of each MBM. Note the differences between MBMs
set to single density and MBMs set to double density.
Note: If you choose a CTM8, DDIM, or 4x16, there are some restrictions on the offsets
you can choose. Refer to the DIP switch settings in
and "4x16 switch settings" on page 127
Chapter 8 Installing a media bay module (MBM)
shows a DS30 broken down into four offset groups of four (single density)
Offset 0
Offset 1
Offset 2
Offset 3
BCM200/400 4.0 Installation and Maintenance Guide
1 DS30 bus
16 lines/32 time slots (single-density)
32 lines/32 time slots (double-density)
"CTM switch settings" on page 124
for details.
111