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Installation and Maintenance Guide
Appendix B
Media bay module combinations
This section describes some combinations of trunk and station modules to demonstrate how to fit 
the modules into the DS30 bus resources. These configurations are meant to help demonstrate how 
your system can be configured using the information in this guide and do not necessarily reflect 
real-life configurations.
Combining CTMs/GATMs and 4X16s
The 4X16 combination media bay module is a combination of a CTM or GATM and a DSM. A 
maximum of four CTMs/GATMs can fit into a DS30 bus, when each is given a different offset. 
Therefore, you can combine a maximum of three GATMs with a 4X16 combination module. This 
configuration would occupy two full DS30 bus blocks. 
Which means, you can install a maximum of three of these combinations in a Business 
Communications Manager box with an extension box added to it. 
 demonstrates this 
configuration of CTMs/GATMs and 4X16 modules, including the switch settings for each module.
Table 61   CTMs/GATMs combined with 4X16 modules 
Each heavily-outlined and shaded square represents one 
module.
Switch setting
DS30
bus #
2
4x16s
Offset 3
4
CTMs/GATM4s
Offset 0, 1 and 2
1
CTM8/GATM8
Offset  2
1
2
3
4
5
6
2
0
CTM/GATM 4settings:
on on on on on on
1
CTM/GATM4 settings:
on on off on on on
2
CTM/GATM4 settings:
on off on on on on
3
Switch settings for 4X16:
on off off on on on
3
4
0
CTM/GATM4  settings:
on on on on off on
2 
(CTM8/GATM8)
on on off on off on
on off on on off on
3
Switch settings for 4X16:
on off off on off on
5