Business Communications Manager 3.0 is Windows XP compatible, therefore, any references
in the main document about required computer platforms can include computers running
Windows XP.

Explaining Double Density

Business Communications Manager 3.0 software now utilizes the B2 channels on DS30 buses
02 to 07 for digital telephones, thereby, doubling telephone capacity. The following figure
shows a DS30 bus broken down into four offset groups of four (single density) or eight (double
density) lines each.

Figure 11 Offsets are part of DS30 bus line groups

The default 3.0 system is a Partial Double Density (PDD) system, in that it maintains DS30 06
and 07 in the original configuration of 16 lines per bus. This accommodates those systems
which use Companion. If you choose to set your system to Full Double Density (FDD),
DS30 06 and 07 become FDD and are no longer available for Companion operation.

To take advantage of the double density functionality, you require DSM16+ or DSM32+
modules. The existing ASM8 modules can also utilize FDD.

Note: Devices that share a DS30 channel must be identical. Use two DSM 16+ modules in
full double density mode on a single DS30 channel. Likewise, use two DSM 32+ modules
in full double density mode on a single DS30 channel.

1 DS30 bus
16 lines/32 time slots (single density)

Offset 0

Offset 1
Offset 2
Offset 3

Offsets
have
four lines (single density)

32 lines/32 time slots (double density)

8 lines (double density)