86 Chapter 7 Setting media bay module DIP switchesN0008587 01DSM32 module, because the second level of DSM lines would not be accessible. The sameapplies to assigning a DSM32 to DSM30 06 if your system is set to a 3/5 DSM30 split. Referto DSM switch settings on page 104.• The DIP switches on the 4X16 module are used to set the DS30 bus number and offset for theCTM part of the module. The module automatically assigns an additional DS30 bus for the 16DSM lines. However, you cannot choose DS30 07 for the 4X16 module, because the DSMlines would not be accessible. The same applies to DS30 06 if your system is set to a 3/5 DS30split. Refer to 4X16 switch settings on page 99.• The CTM8 module uses two offsets on a DS30 bus. You assign the first offset to the module,and the second offset is automatically selected. This means that you can choose offset pairs0-1, 1-2, or 2-3. Because the module requires two offsets on the same DS30 bus, you cannotselect offset 3. Refer to CTM/GATM switch settings on page 95.• Not all modules are available to all systems. Refer to Chapter 2, “Telephony hardware,” onpage 33 for specifics about each module.Choosing the assigned order for modulesAssign the media bay modules and DS30 bus numbers in the order shown in Figure 37.Station modules are assigned starting with DS30 02. This allows telephones to start numberingfrom the system Start DN (Default: 221).Trunk modules are assigned starting at DS30 07, in a system with a 2/6 DS30 split, and at DS30 06in a system with a 3/5 DS30 split. The exception to this is the 4X16 module, which requires twoDS30 blocks, so it must be set to a DS30 bus that has the next bus open.Note: Remember, if you have chosen a 3/5 DS30 split for your system, DS30 07 is nolonger available for media bay modules.
