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Telephony Hardware Selection and Settings 323
Installation and Maintenance Guide
• DSM 32 modules require two DS30 numbers. When you assign the first DS30 number to a
DSM 32, the module automatically adds the next DS30 number. For example, if you assign
DS30 2 to an DSM 32, it uses DS30 2 and 3. However, you cannot choose DS30 7 for the
DSM32 module, because the second level of DSM lines would not be accessible. The same
applies to DS30 6 if your system is set to a 3/5 split. Refer to DSM switch settings on page
338.
DSM 32+ modules can be set to either single or double density. When they are set to double
density, the module only requires one DS30 bus.
• The DIP switches on the 4X16 module are used to set the DS30 designation and offset for the
CTM part of the module. The module automatically assigns an additional DS30 for the 16
DSM lines. However, you cannot choose DS30 7 for the 4X16 module, because the DSM lines
would not be accessible. The same applies to DS30 6 if your system is set to a 3/5 split. Refer
to 4X16 switch settings on page 336.
• Companion: configure the DSM or DSMs handling Business Communications Manager
Companion to DS30 DS30 6 or 7. You must change the module number of any trunk media
bay modules configured to module 6 or 7 to an unassigned module number to prevent conflicts
with Companion.
• The CTM8 module, when set to single density, 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 pairs 0-1, 1-2, or 2-3. Because the module requires two offsets on the same
DS30, you cannot select offset 3. Refer to CTM switch settings on page 334.
When the CTM8 is set to double density, you can install four CTM8s per DS30 bus, using all
four offsets.
• Not all modules are available to all systems. Refer to “Media Bay Module System Selection”
on page 313 for specifics about each module.
Note: Companion DS30 split restrictions:
If you choose a 3/5 channel split for your system, the second module cannot be assigned.
Therefore, you can add a maximum of 16 Companion base stations, which support a
maximum of 30 handsets. This means you can only use a DSM 16 on DS30 6. You cannot
assign a DSM 32.
If your system is set to full double density (FDD), DS30 6 and/or 7 do not support
Companion.
Note: Remember, if you have chosen a 3/5 channel split for your system, DS30 7 is no
longer available for media bay modules.