Nortel BCM200 Installation And Maintenance Manual page 107

2 Use the number of lines and the number of lines per MBM to determine how many MBMs you
need.
Table 25 Determine trunk MBM requirements
Type of lines
T1 digital lines
Universal T1 MUX digital
lines
PRI digital lines (NA)
E1 digital lines
PRI digital lines (EMEA)
Analog lines
Analog lines
Analog lines
Analog lines
Analog lines
BRI ISDN lines
For example:
• If you require 24 T1 digital lines, you need 1 DTM because a single DTM can handle 24
T1 lines (North America).
• If you require 2 analog lines and 24 T1 digital lines, you need 1 GATM4 and 1 DTM.
Note: Although the DTM supports several types of digital lines, you cannot connect
different types of lines to the same DTM. You can add a maximum of three DTMs or
DDIMs to your BCM system.
Tip: The BCM400 main unit holds a maximum of four MBMs. If you require more
MBMs, the BCM expansion unit supports a maximum of six additional MBMs.
Number
of lines Type of MBM
DTM
DDIM
DTM
DTM
DTM
CTM4
CTM8
GATM4
GATM8
4x16 combination MBM
BRIM S/T
Chapter 8 Installing a media bay module (MBM)
Number of lines
per MBM
24
24
(also requires a full
DS30 bus for the data
module)
23
30
30
4
8
4
8
4
(also requires half of
the next DS30 bus for
the DSM16 part)
4 ISDN loops
BCM200/400 4.0 Installation and Maintenance Guide
107
Number of MBMs
required
______ DTM
______ DDIM
______ DTM
______ DTM
______ DTM
______ CTM
______ CTM
______ GATM
______ GATM
______ CTM
______ BRIM S/T