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Installation and Maintenance Guide
Chapter 7
Setting media bay module DIP switches
Before you install a media bay module, assign switch settings for the media bay module. These
settings determine which line numbers (trunks) or DNs (extensions) the equipment connected to
the module will have access to. The DIP switches are located on the back or underside of the
media bay module.
Start from the list of modules you chose in Chapter 4, “Selecting the media bay modules for your
system,” on page 91.
After you determine which DS30 channels you want to use, and how much DS30 channel capacity
each module requires, you determine the location of the modules on the DS30 array. From that
information, you choose switch settings for each module. These settings are then set on the module
DIP switches.
This chapter describes the latter process of positioning your modules in the DS30 hierarchy and
determining and setting the DIP switch settings on the module.
Rules for assigning DS30 channels
Media bay modules are assigned to DS30 channels in a specific hierarchical manner. This section
describes the preferred order of positioning for each type of module.
Notes about assigning modules
The following are some general notes about assigning modules:
• If you chose a 3/5 channel split for your system, DS30 channel 7 cannot be used by any
module. For modules that require two channels, this means that you cannot set the DIP
switches to channel 6 for those modules, because the second level of lines would fall into
channel 7, and would not be accessible. Refer to Figure 39 on page 117.
Refer to “Understanding DS30 channel numbers” on page 94 for more information about 2/6
and 3/5 DS30 channel splits.
• DSM 32 modules require two DS30 channel numbers. When you assign the first DS30
channel number to an DSM 32, the module automatically adds the next DS30 channel number.
For example, if you assign DS30 channel number 2 to an DSM 32, it uses DS30 channel
Note: Fiber Expansion Module (FEM) switches
The switches on the fiber expansion module (FEM) do not work in the same way as those
on the other media bay modules. On the FEM, the switches turn the fiber ports on and off.
For information about setting the switches on an FEM, refer to “FEM switch settings” on
page 130.