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Chapter 7 Setting media bay module DIP switches 123
Installation and Maintenance Guide
CTM switch settings
There are two models of CTMs.
• CTMs have four lines, therefore, you can add a maximum of four CTMs per DS30 channel.
• CTM8s have eight lines. This module uses two offset settings per module. Therefore, you can
add a maximum of two CTM8 modules per DS30 channel.
• You can also mix the two modules. For instance, if you have two existing CTM modules with
offset 0 and 1, you can add a CTM8 on offset 2.
CTM: The CTM provides connections for four analog calling line identification (CLID) PSTN
lines. Each voice line uses one line in the offset. Since each DS30 channel has four lines per offset,
you can assign a maximum of four CTMs to a single DS30 channel by making the offset switch
settings different for each module. You can also combine three CTMs with the trunk module part
of the 4X16 module on the same DS30 channel.
CTM8: The CTM8 provides connections for eight analog calling line identification (CLID) PSTN
lines. Each line uses one voice line. Since each DS30 channel has four lines per offset, you require
two offsets for each module. You can assign a maximum of two CTM8s to a DS30 channel, by
making the offset switch settings different for each module.
You can also combine a CTM8 with a 4X16 module on the same DS30 channel.
When you choose an offset number for the CTM8, the system automatically adds the next offset
number. You cannot assign offset 3 to the CTM8 module, because this does not allow the module
to assign the second set of lines.
Table 20 shows the switch settings for each DS30 channel, and the resulting line assignments for
CTMs and CTM8s.
Table 20 CTM and CTM8 switch settings, DS30 channels 2-5
Select
DS30
ch.
Select
offset
Enter these switch settings To assign
these lines
To assign these lines.
CTM8
123456
CTM
Lower
(Lines 1-4)
Upper
(lines 5-8)
2
0
on on on on on on
211-214
211-214 219-222
1
on on on on on
219-222
219-222 227-230
off
2
on on on on on
227-230
227-230 235-238
off
3
on on on on
235-238
Not supported Not supported
off off