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320 Telephony Hardware Selection and Settings
P0993133 03
Determining module channel requirements
Figure 196 shows how much of a DS30 channel each module requires. Note the differences
between modules set to single density and modules set to double density.
Figure 195 Space requirements for media bay modules, on a per-DS30 configuration
Note: If you choose a CTM8, DDIM or a 4X16 module, there are some restrictions about
the offsets you can choose. Refer to the DIP switch settings in “CTM switch settings” on
page 334 and “4X16 switch settings” on page 336 for details
1 DTM
3 BRIs
4 CTMs
CTM8s
per DS30
per DS30
Trunks (lines)
Stations (extensions)
per DS30
1 DS30 bus/
offset set to 0
1 DS30 bus/
offset set to 0, 1, or 2
1 DS30 bus/
offset set to 0, 1, 2, or 3
1 DS30 bus/
offset set to 0, 1, or 2
per DS30
max. of
2 offsets
Single-density modules
Double-density module
s
4 DD ASM8s
1 DS30 bus/
per DS30
2 DD DSM 16+
per DS30
1 DS30 bus
1 DD DSM 32+
per DS30
1 DS30 bus/
1 DSM 16
per DS30
1 DS30 bus/
offset set to 0
1 DSM 32
per 2 DS30s
2 DS30 buses/
offset set to 0