User's Manual
Chapter 8 Installing a media bay module (MBM) 123
BCM200/400 4.0 Installation and Maintenance Guide
BRI switch settings
You can install a maximum of three BRIM MBMs per DS30 bus on the offsets indicated in
Table 34.
CTM switch settings
There are two models of CTMs.
CTM4: The CTM4 provides connections for four analog calling line identification (CLID) PSTN
lines. Each voice line uses one line in the offset. Because each DS30 bus 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 MBM. You can also combine three CTMs with the trunk part of the
4x16 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. Because each DS30 bus has four lines per offset, you require
two offsets. You can assign a maximum of two CTM8s to a DS30 bus by making the offset switch
settings different for each MBM. You can also combine a CTM8 with a 4x16 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 because this does not allow the MBM to
assign the second set of lines.
You can also mix the two MBMs. For instance, if you have two existing CTM MBMs with offset
0 and 1, you can add a CTM8 on offset 2.
Table 34 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 split, DS30 bus 7 is not available.