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334 Telephony Hardware Selection and Settings
P0993133 03
BRI switch settings
You can install a maximum of three BRI modules per DS30 bus on the offsets indicated below.
Table 58 shows the switch settings for each DS30 number, and the resulting line assignments.
CTM switch settings
There are two models of CTMs.
• CTMs have four lines, therefore, you can add a maximum of four CTMs per DS30 bus.
• CTM8s have eight lines. This module uses two offset settings per module. Therefore, you can
add a maximum of two CTM8 modules per DS30 bus.
• 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 bus 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 bus.
CTM8: The CTM8 provides connections for eight analog calling line identification (CLID) PSTN
lines. Each line uses one voice line. Since each DS30 bus has four lines per offset, you require two
offsets for each module. You can assign a maximum of two CTM8s to a DS30 bus, by making the
offset switch settings different for each module.
Table 58 BRIM S/T switch settings
Select
DS30
bus
Select
offset
Enter these switch
settings
To
assign
these
lines
Select
DS30
bus
Select
offset
Enter these switch
settings
To assign
these
lines
123456 1 23456
2 0
on on on on on on
211-218 5 0
on on on on
off off
121-128
1
on on
off
on on on
219-226 1
on on
off
on
off off
129-136
2
on
off
on on on on
227-234 2
on
off
on on
off off
137-144
3 0
on on on on on
off
181-188 6 0
on on on
off
on on
91-98
1
on on
off
on on
off
189-196 1
on on
off off
on on
99-106
2
on
off
on on on
off
197-204 2
on
off
on
off
on on
107-114
4 0
on on on on
off
on
151-158 ***7 0
on on on
off
on
off
61-68
1
on on
off
on
off
on
159-166 1
on on
off off
on
off
69-76
2
on
off
on on
off
on
167-174 2
on
off
on
off
on
off
77-84
***If your system is configured with a 3/5 DS30 channel split, DS30 channel 7 is not available.