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116 Chapter 7 Setting media bay module DIP switches
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numbers 2 and 3. However, you cannot choose DS30 channel 7 for the DSM32 module,
because the second level of DSM lines would not be accessible. The same applies to channel 6
if your system is set to a 3/5 split. Refer to DSM switch settings on page 128.
• The DIP switches on the 4X16 module are used to set the DS30 channel and offset for the
CTM part of the module. The module automatically assigns an additional DS30 channel for
the 16 DSM lines. However, you cannot choose DS30 channel 7 for the 4X16 module, because
the DSM lines would not be accessible. The same applies to channel 6 if your system is set to
a 3/5 split. Refer to 4X16 switch settings on page 125.
• Companion: configure the DSM or DSMs handling Business Communications Manager
Companion to DS30 channel 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 uses two offsets on a DS30 channel. 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 channel, you
cannot select offset 3. Refer to CTM switch settings on page 123.
• Not all modules are available to all systems. Refer to Chapter 2, “Telephony hardware,” on
page 69 for specifics about each module.
Choosing the assigned order for modules
Assign the media bay modules and DS30 channels in the order shown in Figure 39.
Station modules are assigned starting with DS30 channel 2. This allows telephones to start
numbering from the system Start DN (Default: 221). The exception to this is a DSM used for
Companion, which must be installed on channel 6 (DSM32) or channels 6 and 7 (two DSM 16s). If
your system is set to a 3/5 split, you can only assign a DSM16 to channel 6 for Companion.
Trunk modules are assigned starting at DS30 channel 7, in a system with a 2/6 DS30 split, and at
channel 6 in a system with a 3/5 split. The exception to this is the 4X16 module, which requires
two DS30 channels, so it must be set to a DS30 channel that has the next channel open..
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 on channel 6. You cannot
assign a DSM 32.
Note: Remember, if you have chosen a 3/5 channel split for your system, channel 7 is no
longer available for media bay modules.