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Telephony Hardware Selection and Settings 335
Installation and Maintenance Guide
You can also combine a CTM8 with a 4X16 module on the same DS30 number.
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 59 shows the switch settings for each DS30 number, and the resulting line assignments for
CTMs and CTM8s.
Table 59 CTM and CTM8 switch settings
Select
DS30
bus
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
off
on on on
219-222
219-222 227-230
2
on
off
on on on on
227-230
227-230 235-238
3
on
off off
on on on
235-238
Not supported Not supported
3
0
on on on on on
off
181-184
181-184 189-192
1
on on
off
on on
off
189-192
189-192 197-200
2
on
off
on on on
off
197-200
197-200 205-208
3
on
off off
on on
off
205-208
Not supported Not supported
4
0
on on on on
off
on
151-154
151-154 159-162
1
on on
off
on
off
on
159-162
159-162 167-170
2
on
off
on on
off
on
167-170
167-170 175-178
3
on
off off
on
off
on
175-178
Not supported Not supported
5
0
on on on on
off off
121-124
121-124 129-132
1
on on
off
on
off off
129-132
129-132 137-140
2
on
off
on on
off off
137-140
137-140 145-148
3
on
off off
on
off off
145-148
Not supported Not supported
6
0
on on on
off
on on
91-94
91-94 99-102
1
on on
off off
on on
99-102
99-102 107-110
2
on
off
on
off
on on
107-110
107-110 115-118
3
on
off off off
on on
115-118
Not supported Not supported
***7
0
on
on on
off
on
off
61-64
61-64 69-72
1
on
on
off off
on
off
69-72
69-72 77-80
2
on off
on
off
on
off
77-80
77-80 85-88
3
on off off off
on
off
85-88
Not supported Not supported
***If your system is configured with a 3/5 DS30 channel split, DS30 channel 7 is not available.