Chapter 4 Selecting the media bay modules for your system 63Installation and Maintenance GuideChanging the DS30 splitYou can change the DS30 bus allocation to a 3/5 split to accommodate increased IP telephony orVoIP trunk requirements. You do this by assigning DS30 07 to the voice data sector. This choiceshould be made at system startup, but a default system can be changed through the UnifiedManager to a 3/5 split after startup if IP requirements increase. At startup, you indicate the splityou want when you run the Quick Start Wizard. Refer to the Programming Operations Guide fordetails.Figure 25 shows a model of how the DS30 bus blocks are a subgroup of the DS256 bus on theMSC. The diagram also shows offsets, which are a subgroup of the DS30 blocks.Figure 25 DS30 bus modelDS30 bus numbers are set using the number 4, 5, and 6 DIP switches on the back or underside ofthe media bay modules. The exception is the FEM module. The FEM DIP switches turn on ports,each of which consumes one DS30 bus.Explaining Double DensityBCM 3.0 software introduced the concept of single and double density for DS30 buses supportingstation modules. On these buses the B2 bus blocks are reconfigured as B1 bus blocks, thereby,doubling telephone capacity. However, only DSM16+, DSM32+ and ASM/GASM8 modules cansupport the second set of DNs. The DSM16+ and DSM32+ modules can be configured for eithersingle density, which access only the top 16 DNs, or double density, which accesses all 32 DNs.Warning: If you change the DS30 split from 3/5 to 2/6 after your system is configured,you will lose all the data and optional application connections.DS256on MSCDS30 bus 02DS30 bus 03DS30 bus 04DS30 bus 05DS30 bus 06DS30 bus 07DS30 blocksavailable to modulesin a 2/6 splitFour offsets per busDS30 blocksavailable to modulesin a 3/5 split
